CVE-2022-25304

HIGHNVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 1.5% (73rd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

All versions of package opcua; all versions of package asyncua are vulnerable to Denial of Service (DoS) due to a missing limitation on the number of received chunks - per single session or in total for all concurrent sessions. An attacker can exploit this vulnerability by sending an unlimited number of huge chunks (e.g. 2GB each) without sending the Final closing chunk.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
34
EG Risk 34/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation1.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from 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.
EPSS PROB
1.5%
EPSS %ILE
73rd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from 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; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” 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

August 23, 2022

Last Modified

November 21, 2024

References (3)

Affected Packages

(3 across 2 ecosystems)
PyPI(2)
PackageVulnerable rangeFix by version rangeDependents
asyncua0.5.0 ... 0.9.95 (26 versions)
  • every version up to 0.9.96: fixed in 0.9.96
—
opcua0.90.4 ... 0.98.9 (23 versions)
  • every version through 0.98.13: no fix on record
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
python-opcua0.98.11-1, 0.98.11-2
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 25× 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 90 of 167 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. 10 repeat rows among the latest 100 are merged into the row they repeat. The 77 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-12 18:58 UTCEG score recompute
  2. 2026-10-12 16:30 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  3. 2026-10-11 23:24 UTCEG score recompute
  4. 2026-10-11 13:44 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  5. 2026-10-10 19:56 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  6. 2026-10-09 20:04 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  7. 2026-10-08 16:40 UTCEPSS rescoreEPSS 1.3% · 70th percentile
  8. 2026-10-07 23:45 UTCEPSS rescoreEPSS 1.3% · 70th percentile
  9. 2026-10-06 15:14 UTCEPSS rescoreEPSS 1.3% · 70th percentile
  10. 2026-10-05 17:40 UTCEPSS rescoreEPSS 1.3% · 70th percentile
  11. 2026-10-04 23:19 UTCEPSS rescoreEPSS 1.3% · 70th percentile
  12. 2026-10-03 14:22 UTCEPSS rescoreEPSS 1.3% · 70th percentile
  13. 2026-09-30 15:51 UTCEG score recompute
  14. 2026-09-30 15:00 UTCEPSS rescoreEPSS 1.3% · 70th percentile
  15. 2026-09-29 15:15 UTCEPSS rescoreEPSS 1.3% · 70th percentile
  16. 2026-09-28 13:48 UTCEPSS rescoreEPSS 1.3% · 70th percentile
  17. 2026-09-27 13:41 UTCEPSS rescoreEPSS 1.3% · 70th percentile
  18. 2026-09-26 00:22 UTCEPSS rescoreEPSS 1.3% · 70th percentile
  19. 2026-09-24 14:00 UTCEPSS rescoreEPSS 1.3% · 70th percentile
  20. 2026-09-24 13:03 UTCOSV refresh
  21. 2026-09-23 13:45 UTCEPSS rescoreEPSS 1.3% · 70th percentile
  22. 2026-09-17 19:23 UTCEPSS rescoreEPSS 1.3% · 70th percentile
  23. 2026-09-16 14:05 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  24. 2026-09-15 03:06 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  25. 2026-09-13 16:43 UTCEPSS rescoreEPSS 1.3% · 69th percentile
Show 65 more
  1. 2026-09-12 14:57 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  2. 2026-09-11 14:49 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  3. 2026-09-11 09:33 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  4. 2026-09-08 21:57 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  5. 2026-09-07 15:58 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  6. 2026-09-06 13:45 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  7. 2026-09-05 15:25 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  8. 2026-09-05 05:48 UTCOSV refresh
  9. 2026-09-04 13:57 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  10. 2026-09-04 05:04 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  11. 2026-09-02 14:09 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  12. 2026-09-01 13:51 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  13. 2026-08-30 19:14 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  14. 2026-08-30 01:19 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  15. 2026-08-28 21:38 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  16. 2026-08-27 14:22 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  17. 2026-08-26 14:43 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  18. 2026-08-25 13:46 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  19. 2026-08-24 14:13 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  20. 2026-08-21 23:46 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  21. 2026-08-20 22:52 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  22. 2026-08-19 17:01 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  23. 2026-08-18 16:28 UTCOSV refresh
  24. 2026-08-18 13:45 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  25. 2026-08-17 13:44 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  26. 2026-08-16 14:53 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  27. 2026-08-16 02:11 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  28. 2026-08-15 01:27 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  29. 2026-08-13 21:57 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  30. 2026-08-12 13:48 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  31. 2026-08-09 13:44 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  32. 2026-08-08 16:34 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  33. 2026-08-07 16:24 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  34. 2026-08-06 13:44 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  35. 2026-08-05 19:15 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  36. 2026-08-04 10:34 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  37. 2026-08-03 12:27 UTCOSV refresh
  38. 2026-08-03 10:33 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  39. 2026-08-02 02:24 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  40. 2026-08-01 04:13 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  41. 2026-07-30 16:25 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  42. 2026-07-30 01:28 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  43. 2026-07-28 15:33 UTCEPSS rescoreEPSS 1.1% · 61st percentile
  44. 2026-07-26 14:52 UTCEPSS rescoreEPSS 1.1% · 61st percentile
  45. 2026-07-25 14:15 UTCEPSS rescoreEPSS 1.1% · 61st percentile
  46. 2026-07-24 14:15 UTCEPSS rescoreEPSS 1.1% · 61st percentile
  47. 2026-07-23 14:16 UTCEPSS rescoreEPSS 1.1% · 61st percentile
  48. 2026-07-23 02:09 UTCEG score recompute
  49. 2026-07-22 22:56 UTCEG score recompute
  50. 2026-07-22 14:06 UTCEPSS rescoreEPSS 1.1% · 61st percentile
  51. 2026-07-21 15:22 UTCEPSS rescoreEPSS 1.1% · 60th percentile
  52. 2026-07-20 17:05 UTCEPSS rescoreEPSS 1.1% · 60th percentile
  53. 2026-07-19 14:29 UTCEPSS rescoreEPSS 1.1% · 60th percentile
  54. 2026-07-19 02:27 UTCEPSS rescoreEPSS 1.1% · 60th percentile
  55. 2026-07-18 10:02 UTCEPSS rescoreEPSS 1.1% · 60th percentile
  56. 2026-07-16 21:34 UTCOSV refresh
  57. 2026-07-16 17:00 UTCEPSS rescoreEPSS 1.1% · 60th percentile
  58. 2026-07-15 16:56 UTCEPSS rescoreEPSS 1.1% · 60th percentile
  59. 2026-07-15 01:58 UTCEPSS rescoreEPSS 1.1% · 60th percentile
  60. 2026-07-13 22:27 UTCEPSS rescoreEPSS 1.1% · 60th percentile
  61. 2026-07-13 06:11 UTCEPSS rescoreEPSS 1.1% · 60th percentile
  62. 2026-07-12 05:44 UTCEPSS rescoreEPSS 1.1% · 60th percentile
  63. 2026-07-11 08:25 UTCEPSS rescoreEPSS 1.1% · 60th percentile
  64. 2026-07-09 19:07 UTCEPSS rescoreEPSS 1.1% · 60th percentile
  65. 2026-07-08 15:12 UTCEPSS rescoreEPSS 1.1% · 60th percentile

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Frequently asked(5)

What is CVE-2022-25304?
CVE-2022-25304 is a high-severity vulnerability; its CVE record was published on August 23, 2022. All versions of package opcua; all versions of package asyncua are vulnerable to Denial of Service (DoS) due to a missing limitation on the number of received chunks - per single session or in total for all concurrent sessions. An attacker can exploit this vulnerability by sending an unlimited…
When was CVE-2022-25304 made public?
CVE-2022-25304 was made public on August 23, 2022: that is the date its CVE record's CNA, Snyk, gives for when the vulnerability was made public. The CVE record itself was published on August 23, 2022. EchelonGraph's copy of the record carries a last-modified date of November 21, 2024; the record at its source may have been updated since.
Is CVE-2022-25304 actively exploited?
CVE-2022-25304 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.5% probability of exploitation in the next 30 days (73rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2022-25304?
CVE-2022-25304 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2022-25304?
A fix for CVE-2022-25304 is available: update to the fixed version the vendor names in its advisory.

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