CVE-2022-25315

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 9.8 from GitHub Security Advisory published 2022-02-19. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 4.8%CVSS: 9.8Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

In Expat (aka libexpat) before 2.4.5, there is an integer overflow in storeRawNames.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
4.8%
EPSS %ILE
91st
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
4.8% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-22). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

February 18, 2022

Last Modified

October 14, 2026

Advisory Details (9)

Auto-updated Oct 23, 2026
Patch available. Sources: github_pr.
Web page

[SECURITY] [DSA 5085-1] expat security update

https://www.debian.org/security/2022/dsa-5085
Web page

Expat: Multiple Vulnerabilities (GLSA 202209-24) — Gentoo security

https://security.gentoo.org/glsa/202209-24
Web page

[SECURITY] Fedora 35 Update: mingw-expat-2.4.6-1.fc35 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y27XO3JMKAOMQZVPS3B4MJGEAHCZF5OM/
Web page

[SECURITY] Fedora 34 Update: mingw-expat-2.4.6-1.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3UFRBA3UQVIQKXTBUQXDWQOVWNBKLERU/
Web pageMentions a patch (unverified)

[SECURITY] [DLA 2935-1] expat security update

https://lists.debian.org/debian-lts-announce/2022/03/msg00007.html
GitHub pull request

[CVE-2022-25315] lib: Prevent integer overflow in storeRawNames

Fix merged in libexpat/libexpat PR #559 on 2022-02-18 — awaiting tagged release

https://github.com/libexpat/libexpat/pull/559
Web page

oss-security - Expat 2.4.5 released, includes 5 security fixes

http://www.openwall.com/lists/oss-security/2022/02/19/1

Patch Availability(22)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulib64expat1 (2.1.0-7ubuntu0.16.04.5+esm5) @ xenial2026-10-21ubuntu
redhatmingw-expat-0:2.4.8-1.el82022-11-08redhat
redhatexpat2022-10-26redhat
redhatexpat-0:2.2.10-12.el9_02022-05-17redhat
redhatexpat-0:2.0.1-14.el6_102022-04-12redhat
redhatredhat-virtualization-host-0:4.3.22-20220330.1.el7_92022-04-07redhat
redhatexpat-0:2.1.0-14.el7_92022-03-28redhat
redhatexpat-0:2.2.5-3.el8_1.12022-03-28redhat
redhatexpat-0:2.2.5-3.el8_2.22022-03-28redhat
redhatredhat-virtualization-host-0:4.4.10-202203211649_8.52022-03-24redhat
redhatexpat-0:2.2.5-4.el8_4.22022-03-22redhat
redhatexpat-0:2.2.5-4.el8_5.32022-03-16redhat
redhatthunderbird-0:91.7.0-2.el8_12022-03-14redhat
redhatthunderbird-0:91.7.0-2.el7_92022-03-14redhat
redhatthunderbird-0:91.7.0-2.el8_42022-03-14redhat
redhatthunderbird-0:91.7.0-2.el8_22022-03-14redhat
redhatthunderbird-0:91.7.0-2.el8_52022-03-14redhat
redhatfirefox-0:91.7.0-3.el8_42022-03-10redhat
redhatfirefox-0:91.7.0-3.el8_12022-03-10redhat
redhatfirefox-0:91.7.0-3.el7_92022-03-10redhat
redhatfirefox-0:91.7.0-3.el8_22022-03-10redhat
redhatfirefox-0:91.7.0-3.el8_52022-03-10redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(21 across 19 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
expat2.2.10-2, 2.2.10-2+deb11u1
  • every version up to 2.2.10-2+deb11u2: fixed in 2.2.10-2+deb11u2
—
libxmltok1.2-4, 1.2-4.1, 1.2-4.1~exp1, 1.2-4.2
  • every version on: no fix on record
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-1: fixed in 2.4.5-1
—
libxmltok1.2-4, 1.2-4.1, 1.2-4.1~exp1, 1.2-4.2
  • every version on: no fix on record
—
Alpine:v3.12(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.2.10-r2: fixed in 2.2.10-r2
—
Alpine:v3.13(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.2.10-r4: fixed in 2.2.10-r4
—
Alpine:v3.14(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.15(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.16(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.17(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.18(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.19(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Debian:10(1)
PackageVulnerable rangeFix by version rangeDependents
expat2.2.6-2, 2.2.6-2+deb10u1, 2.2.6-2+deb10u2
  • every version up to 2.2.6-2+deb10u3: fixed in 2.2.6-2+deb10u3
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-1: fixed in 2.4.5-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-1: fixed in 2.4.5-1
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
expat2.2.0-2, 2.2.0-2+deb9u1, 2.2.0-2+deb9u2, 2.2.0-2+deb9u3, 2.2.0-2+deb9u4
  • every version up to 2.2.0-2+deb9u5: fixed in 2.2.0-2+deb9u5
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 28× in last 7d / 64× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 98 of 215 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 117 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-23 16:28 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  2. 2026-10-23 12:58 UTCEG score recompute
  3. 2026-10-23 12:58 UTCVendor advisory
  4. 2026-10-23 12:57 UTCGHSA enrichmentGHSA-8w4r-jhg8-8rvj · GitHub CVSS 9.8
  5. 2026-10-22 16:30 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  6. 2026-10-22 11:08 UTCEG score recompute
  7. 2026-10-22 11:08 UTCVendor advisory
  8. 2026-10-22 11:07 UTCGHSA enrichmentGHSA-8w4r-jhg8-8rvj · GitHub CVSS 9.8
  9. 2026-10-21 16:28 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  10. 2026-10-21 09:19 UTCEG score recompute
  11. 2026-10-21 09:19 UTCVendor advisory
  12. 2026-10-21 09:19 UTCGHSA enrichmentGHSA-8w4r-jhg8-8rvj · GitHub CVSS 9.8
  13. 2026-10-20 16:29 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  14. 2026-10-20 07:31 UTCEG score recompute
  15. 2026-10-20 07:31 UTCVendor advisory
  16. 2026-10-20 07:31 UTCGHSA enrichmentGHSA-8w4r-jhg8-8rvj · GitHub CVSS 9.8
  17. 2026-10-19 16:28 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  18. 2026-10-19 05:43 UTCEG score recompute
  19. 2026-10-19 05:43 UTCVendor advisory
  20. 2026-10-19 05:43 UTCGHSA enrichmentGHSA-8w4r-jhg8-8rvj · GitHub CVSS 9.8
  21. 2026-10-18 16:28 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  22. 2026-10-18 03:54 UTCEG score recompute
  23. 2026-10-18 03:54 UTCVendor advisory
  24. 2026-10-18 03:54 UTCGHSA enrichmentGHSA-8w4r-jhg8-8rvj · GitHub CVSS 9.8
  25. 2026-10-17 16:29 UTCEPSS rescoreEPSS 4.8% · 91st percentile
Show 73 more
  1. 2026-10-17 02:06 UTCEG score recompute
  2. 2026-10-17 02:06 UTCVendor advisory
  3. 2026-10-17 02:06 UTCGHSA enrichmentGHSA-8w4r-jhg8-8rvj · GitHub CVSS 9.8
  4. 2026-10-16 16:34 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  5. 2026-10-16 00:18 UTCEG score recompute
  6. 2026-10-16 00:18 UTCVendor advisory
  7. 2026-10-16 00:18 UTCGHSA enrichmentGHSA-8w4r-jhg8-8rvj · GitHub CVSS 9.8
  8. 2026-10-15 16:28 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  9. 2026-10-14 17:29 UTCVendor advisory
  10. 2026-10-14 17:29 UTCGHSA enrichmentGHSA-8w4r-jhg8-8rvj · GitHub CVSS 9.8
  11. 2026-10-14 16:34 UTCEG score recompute
  12. 2026-10-14 16:34 UTCVendor advisory
  13. 2026-10-14 16:34 UTCGHSA enrichmentGHSA-8w4r-jhg8-8rvj · GitHub CVSS 9.8
  14. 2026-10-14 16:29 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  15. 2026-10-13 22:12 UTCEG score recompute
  16. 2026-10-13 22:12 UTCVendor advisory
  17. 2026-10-13 22:11 UTCGHSA enrichmentGHSA-8w4r-jhg8-8rvj · GitHub CVSS 9.8
  18. 2026-10-13 16:29 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  19. 2026-10-12 18:54 UTCEG score recompute
  20. 2026-10-12 18:54 UTCVendor advisory
  21. 2026-10-12 18:54 UTCGHSA enrichmentGHSA-8w4r-jhg8-8rvj · GitHub CVSS 9.8
  22. 2026-10-12 16:30 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  23. 2026-10-11 23:24 UTCEG score recompute
  24. 2026-10-11 13:44 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  25. 2026-10-10 19:56 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  26. 2026-10-09 20:04 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  27. 2026-10-08 16:40 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  28. 2026-10-07 23:45 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  29. 2026-10-06 15:14 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  30. 2026-10-05 17:40 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  31. 2026-10-03 14:22 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  32. 2026-09-30 15:51 UTCEG score recompute
  33. 2026-09-30 15:00 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  34. 2026-09-29 15:15 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  35. 2026-09-28 13:48 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  36. 2026-09-27 13:41 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  37. 2026-09-26 00:22 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  38. 2026-09-25 05:05 UTCOSV refresh
  39. 2026-09-24 14:00 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  40. 2026-09-23 13:45 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  41. 2026-09-17 19:23 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  42. 2026-09-16 14:05 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  43. 2026-09-15 03:06 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  44. 2026-09-12 14:57 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  45. 2026-09-11 14:49 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  46. 2026-09-11 09:33 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  47. 2026-09-08 21:57 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  48. 2026-09-07 15:58 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  49. 2026-09-06 13:45 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  50. 2026-09-05 20:51 UTCOSV refresh
  51. 2026-09-05 15:25 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  52. 2026-09-04 13:57 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  53. 2026-09-04 05:04 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  54. 2026-09-02 14:09 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  55. 2026-09-01 13:51 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  56. 2026-08-30 19:14 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  57. 2026-08-30 01:19 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  58. 2026-08-28 21:38 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  59. 2026-08-27 14:22 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  60. 2026-08-26 14:43 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  61. 2026-08-25 13:46 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  62. 2026-08-24 14:13 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  63. 2026-08-21 23:46 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  64. 2026-08-20 22:52 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  65. 2026-08-19 17:01 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  66. 2026-08-19 07:59 UTCOSV refresh
  67. 2026-08-18 13:45 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  68. 2026-08-17 13:44 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  69. 2026-08-16 14:53 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  70. 2026-08-16 02:11 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  71. 2026-08-15 01:27 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  72. 2026-08-13 21:57 UTCEPSS rescoreEPSS 4.8% · 91st percentile
  73. 2026-08-12 13:48 UTCEPSS rescoreEPSS 4.8% · 91st percentile

Frequently asked(5)

What is CVE-2022-25315?
CVE-2022-25315 is a critical-severity vulnerability; its CVE record was published on February 18, 2022. In Expat (aka libexpat) before 2.4.5, there is an integer overflow in storeRawNames.
When was the CVE record for CVE-2022-25315 published?
The CVE record for CVE-2022-25315 was published on February 18, 2022. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 14, 2026; the record at its source may have been updated since.
Is CVE-2022-25315 actively exploited?
CVE-2022-25315 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.8% probability of exploitation in the next 30 days (91st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2022-25315?
CVE-2022-25315 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2022-25315?
A fix for CVE-2022-25315 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2022-25315 are linked in the Vendor Advisories panel on this page.

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