A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of service when processing crafted input.
CVE-2025-6021
“—” beside the score: it is equal to the CVSS score beside it.
Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2025-06-12. A secondary CVSS source baseline 7.5; sources differ by 0.0.
- CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5HIGHmedium confidence
- EG Risk
- 65EG Risk 65/100
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)Severity75% × 45%Impact severity (EG Severity): CVSS 7.5 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 or medium mission impact; Attend at high (mission-essential systems).Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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
- 1.4%
- EPSS %ILE
- 71st
- 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 (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 1.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-19). 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 or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 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 or medium mission impact; Attend at high (mission-essential systems).
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 partial (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)14 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 partial (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
June 12, 2025
Last Modified
October 12, 2026
Advisory Details (10)
Auto-updated Jun 25, 2026Affected: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Serv
https://access.redhat.com/errata/RHSA-2025:12239Affected: Red Hat Enterprise Linux 8.2 Advanced Update Support.
https://access.redhat.com/errata/RHSA-2025:12237Affected: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.
https://access.redhat.com/errata/RHSA-2025:12199Affected: Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions.
https://access.redhat.com/errata/RHSA-2025:12099Affected: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.6 Update Services for SAP So
https://access.redhat.com/errata/RHSA-2025:12098Affected: Red Hat Enterprise Linux 9.4 Extended Update Support.
https://access.redhat.com/errata/RHSA-2025:11580Affected: Red Hat Enterprise Linux 9.
https://access.redhat.com/errata/RHSA-2025:10699Affected: Red Hat Enterprise Linux 8.
https://access.redhat.com/errata/RHSA-2025:10698Affected: Red Hat Enterprise Linux 10.
https://access.redhat.com/errata/RHSA-2025:10630Vendor Advisories for CVE-2025-6021(20)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:7519Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
- RHSA-2025:19020Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.62 SP2 security update
- RHSA-2025:15672Red Hat Product SecurityHigh
Red Hat Security Advisory: OpenShift Container Platform 4.13.60 bug fix and security update
- RHSA-2025:15308Red Hat Product SecurityHigh
Red Hat Security Advisory: OpenShift Container Platform 4.12.80 bug fix and security update
- RHSA-2025:14396Red Hat Product SecurityHigh
Red Hat Security Advisory: OpenShift Container Platform 4.15.57 bug fix and security update
- RHSA-2025:14059Red Hat Product SecurityHigh
Red Hat Security Advisory: OpenShift Container Platform 4.17.38 bug fix and security update
- RHSA-2025:13289Red Hat Product SecurityHigh
Red Hat Security Advisory: OpenShift Container Platform 4.14.55 bug fix and security update
- RHSA-2025:13335Red Hat Product SecurityHigh
Red Hat Security Advisory: Insights proxy Container Image
- +12 more
Patch Availability(24)
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
(8 across 8 ecosystems)
Alpine:v3.21(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| libxml2 | — |
| — |
Alpine:v3.22(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| libxml2 | — |
| — |
Alpine:v3.23(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| libxml2 | — |
| — |
Alpine:v3.24(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| libxml2 | — |
| — |
Debian:11(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| libxml2 | 2.9.10+dfsg-6.7 ... 2.9.10+dfsg-6.7+deb11u7 (8 versions) |
| — |
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| libxml2 | 2.9.14+dfsg-1.2, 2.9.14+dfsg-1.3~deb12u1, 2.9.14+dfsg-1.3~deb12u2 |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| libxml2 | — |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| libxml2 | — |
| — |
Weakness Classification(3)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Additional Vendor Advisories
(5)
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.
- Red HatRHSA-2025:10630MODERATE2025-06-12
RHSA-2025:10630 — Moderate
- Red HatRHSA-2025:10698MODERATE2025-06-12
RHSA-2025:10698 — Moderate
- Red HatRHSA-2025:13325MODERATE2025-06-12
RHSA-2025:13325 — Moderate
- Red HatRHSA-2025:13336MODERATE2025-06-12
RHSA-2025:13336 — Moderate
- UbuntuUSN-7694-1MEDIUM
libxml2 vulnerabilities
Data Freshness Timeline
(refreshed 11× in last 7d / 40× 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 99 of 231 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. 1 repeat row among the latest 100 is merged into the row it repeats. The 132 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-20 10:04 UTCEG score recompute
- 2026-10-20 10:04 UTCVendor advisory
- 2026-10-20 10:04 UTCGHSA enrichmentGHSA-32vr-5hxf-x93f · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-10-18 05:22 UTCEG score recompute
- 2026-10-17 16:33 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-10-16 16:39 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-10-15 16:31 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-10-14 16:31 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-10-13 16:33 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-10-12 21:26 UTCEG score recompute
- 2026-10-12 21:26 UTCVendor advisory
- 2026-10-12 21:26 UTCGHSA enrichmentGHSA-32vr-5hxf-x93f · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-10-12 20:26 UTCEG score recompute
- 2026-10-12 20:26 UTCVendor advisory
- 2026-10-12 20:26 UTCGHSA enrichmentGHSA-32vr-5hxf-x93f · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-10-12 16:53 UTCEG score recompute
- 2026-10-12 16:33 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-10-11 20:27 UTCEG score recompute
- 2026-10-11 18:38 UTCEG score recompute
- 2026-10-11 15:13 UTCEG score recompute
- 2026-10-11 13:47 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-10-10 19:59 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-10-09 20:06 UTCEPSS rescoreEPSS 1.4% · 71st percentile
Show 74 moreShow fewer
- 2026-10-08 17:11 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-10-08 12:35 UTCOSV refresh
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-10-05 17:42 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-10-04 23:21 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-10-01 19:49 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-09-30 15:02 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-09-29 15:20 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-09-28 13:50 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-09-24 14:02 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-09-23 13:47 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-09-20 20:15 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-09-18 19:27 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-09-18 18:33 UTCEG score recompute
- 2026-09-18 18:33 UTCVendor advisory
- 2026-09-18 18:33 UTCGHSA enrichmentGHSA-32vr-5hxf-x93f · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-09-18 17:44 UTCEG score recompute
- 2026-09-18 17:44 UTCVendor advisory
- 2026-09-18 17:44 UTCGHSA enrichmentGHSA-32vr-5hxf-x93f · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-09-17 19:30 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-09-16 14:07 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-09-16 05:14 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-09-15 03:10 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-09-13 16:46 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-09-12 15:00 UTCEPSS rescoreEPSS 1.3% · 68th percentile
- 2026-09-11 14:52 UTCEPSS rescoreEPSS 1.3% · 68th percentile
- 2026-09-11 09:36 UTCEPSS rescoreEPSS 1.3% · 68th percentile
- 2026-09-10 09:34 UTCEPSS rescoreEPSS 1.3% · 68th percentile
- 2026-09-08 22:00 UTCEPSS rescoreEPSS 1.3% · 67th percentile
- 2026-09-07 16:00 UTCEPSS rescoreEPSS 1.3% · 67th percentile
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 1.3% · 67th percentile
- 2026-09-04 05:06 UTCEPSS rescoreEPSS 1.3% · 67th percentile
- 2026-09-02 14:11 UTCEPSS rescoreEPSS 1.3% · 67th percentile
- 2026-09-01 13:53 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-09-01 12:32 UTCEG score recompute
- 2026-09-01 12:32 UTCVendor advisory
- 2026-09-01 12:32 UTCGHSA enrichmentGHSA-32vr-5hxf-x93f · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-09-01 11:57 UTCEG score recompute
- 2026-09-01 11:57 UTCVendor advisory
- 2026-09-01 11:57 UTCGHSA enrichmentGHSA-32vr-5hxf-x93f · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-08-31 18:36 UTCEG score recompute
- 2026-08-31 18:36 UTCVendor advisory
- 2026-08-31 18:36 UTCGHSA enrichmentGHSA-32vr-5hxf-x93f · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-08-31 17:27 UTCEG score recompute
- 2026-08-31 17:27 UTCVendor advisory
- 2026-08-31 17:27 UTCGHSA enrichmentGHSA-32vr-5hxf-x93f · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-08-30 01:21 UTCEPSS rescoreEPSS 1.2% · 64th percentile
- 2026-08-29 00:13 UTCOSV refresh
- 2026-08-28 21:40 UTCEPSS rescoreEPSS 1.2% · 64th percentile
- 2026-08-27 14:24 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-26 14:45 UTCEPSS rescoreEPSS 1.2% · 64th percentile
- 2026-08-25 13:48 UTCEPSS rescoreEPSS 1.2% · 64th percentile
- 2026-08-24 14:16 UTCEPSS rescoreEPSS 1.2% · 64th percentile
- 2026-08-23 00:18 UTCEPSS rescoreEPSS 1.2% · 64th percentile
- 2026-08-21 23:48 UTCEPSS rescoreEPSS 1.2% · 64th percentile
- 2026-08-20 22:55 UTCEPSS rescoreEPSS 1.2% · 64th percentile
- 2026-08-19 17:03 UTCEPSS rescoreEPSS 1.2% · 64th percentile
- 2026-08-18 13:48 UTCEPSS rescoreEPSS 1.2% · 64th percentile
- 2026-08-17 13:46 UTCEPSS rescoreEPSS 1.2% · 64th percentile
- 2026-08-16 14:55 UTCEPSS rescoreEPSS 1.2% · 64th percentile
- 2026-08-16 02:14 UTCEPSS rescoreEPSS 1.2% · 64th percentile
- 2026-08-15 01:30 UTCEPSS rescoreEPSS 1.2% · 64th percentile
- 2026-08-13 22:00 UTCEPSS rescoreEPSS 1.2% · 64th percentile
- 2026-08-12 13:50 UTCEPSS rescoreEPSS 1.2% · 64th percentile
- 2026-08-12 11:40 UTCOSV refresh
- 2026-08-11 13:42 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
- 2026-08-10 23:59 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
- 2026-08-09 13:46 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
- 2026-08-08 16:36 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
- 2026-08-07 16:27 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
- 2026-08-06 13:46 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownAlpine:v3.21:libxml2
Same vendor
10 shownredhat:RHSA-2025:10630 · redhat:RHSA-2025:12098 · redhat:RHSA-2025:13267
Frequently asked(5)
What is CVE-2025-6021?
When was CVE-2025-6021 made public?
Is CVE-2025-6021 actively exploited?
What is the CVSS score of CVE-2025-6021?
How do I remediate CVE-2025-6021?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2025-6021
Is Your Infrastructure Affected by CVE-2025-6021?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.