CVE-2026-20337

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-07. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A vulnerability in the zip archive parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper boundary checks for content in zip files during scanning, which may result in an out-of-bounds write condition. An attacker could exploit this vulnerability by submitting a crafted zip file for scanning. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

August 7, 2026

Last Modified

August 11, 2026

Advisory Details (1)

Auto-updated Aug 7, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

ClamAV Vulnerabilities Affecting Cisco Products: August 2026

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26

Vendor Advisories for CVE-2026-20337(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 33× in last 7d / 139× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 193 total refreshes for this CVE.

  1. 2026-09-19 06:40 UTCEG score recompute
  2. 2026-09-19 06:40 UTCVendor advisory
  3. 2026-09-19 06:40 UTCGHSA enrichment
  4. 2026-09-18 19:27 UTCEPSS rescore
  5. 2026-09-18 17:34 UTCVendor advisory
  6. 2026-09-18 17:34 UTCGHSA enrichment
  7. 2026-09-18 04:05 UTCEG score recompute
  8. 2026-09-18 04:05 UTCVendor advisory
  9. 2026-09-18 04:05 UTCGHSA enrichment
  10. 2026-09-17 15:11 UTCVendor advisory
  11. 2026-09-17 15:11 UTCGHSA enrichment
  12. 2026-09-17 00:53 UTCEG score recompute
  13. 2026-09-17 00:53 UTCVendor advisory
  14. 2026-09-17 00:53 UTCGHSA enrichment
  15. 2026-09-16 14:07 UTCEPSS rescore
  16. 2026-09-16 05:15 UTCEPSS rescore
  17. 2026-09-16 02:51 UTCVendor advisory
  18. 2026-09-16 02:51 UTCGHSA enrichment
  19. 2026-09-15 06:34 UTCEG score recompute
  20. 2026-09-15 06:34 UTCVendor advisory
  21. 2026-09-15 06:34 UTCGHSA enrichment
  22. 2026-09-14 16:52 UTCVendor advisory
  23. 2026-09-14 16:51 UTCGHSA enrichment
  24. 2026-09-14 03:57 UTCEG score recompute
  25. 2026-09-14 03:57 UTCVendor advisory
Show 75 more
  1. 2026-09-14 03:57 UTCGHSA enrichment
  2. 2026-09-13 16:47 UTCEPSS rescore
  3. 2026-09-13 15:02 UTCVendor advisory
  4. 2026-09-13 15:02 UTCGHSA enrichment
  5. 2026-09-13 01:53 UTCEG score recompute
  6. 2026-09-13 01:53 UTCVendor advisory
  7. 2026-09-13 01:53 UTCGHSA enrichment
  8. 2026-09-12 15:01 UTCEPSS rescore
  9. 2026-09-12 12:58 UTCVendor advisory
  10. 2026-09-12 12:58 UTCGHSA enrichment
  11. 2026-09-12 00:03 UTCEG score recompute
  12. 2026-09-12 00:03 UTCVendor advisory
  13. 2026-09-12 00:03 UTCGHSA enrichment
  14. 2026-09-11 14:52 UTCEPSS rescore
  15. 2026-09-11 09:41 UTCEG score recompute
  16. 2026-09-11 09:41 UTCGHSA enrichment
  17. 2026-09-11 09:36 UTCEPSS rescore
  18. 2026-09-10 20:46 UTCEG score recompute
  19. 2026-09-10 20:46 UTCGHSA enrichment
  20. 2026-09-10 09:34 UTCEPSS rescore
  21. 2026-09-10 07:51 UTCGHSA enrichment
  22. 2026-09-09 18:56 UTCVendor advisory
  23. 2026-09-09 18:56 UTCGHSA enrichment
  24. 2026-09-09 06:00 UTCEG score recompute
  25. 2026-09-09 06:00 UTCVendor advisory
  26. 2026-09-09 06:00 UTCGHSA enrichment
  27. 2026-09-08 22:00 UTCEPSS rescore
  28. 2026-09-08 07:28 UTCVendor advisory
  29. 2026-09-08 07:28 UTCGHSA enrichment
  30. 2026-09-07 17:44 UTCEG score recompute
  31. 2026-09-07 17:44 UTCVendor advisory
  32. 2026-09-07 17:44 UTCGHSA enrichment
  33. 2026-09-07 16:01 UTCEPSS rescore
  34. 2026-09-06 18:02 UTCEG score recompute
  35. 2026-09-06 18:02 UTCVendor advisory
  36. 2026-09-06 18:02 UTCGHSA enrichment
  37. 2026-09-06 13:47 UTCEPSS rescore
  38. 2026-09-06 05:07 UTCVendor advisory
  39. 2026-09-06 05:07 UTCGHSA enrichment
  40. 2026-09-05 16:11 UTCEG score recompute
  41. 2026-09-05 16:11 UTCVendor advisory
  42. 2026-09-05 16:11 UTCGHSA enrichment
  43. 2026-09-05 02:22 UTCEG score recompute
  44. 2026-09-05 02:22 UTCVendor advisory
  45. 2026-09-05 02:22 UTCGHSA enrichment
  46. 2026-09-04 09:04 UTCEG score recompute
  47. 2026-09-04 09:04 UTCVendor advisory
  48. 2026-09-04 09:04 UTCGHSA enrichment
  49. 2026-09-04 05:06 UTCEPSS rescore
  50. 2026-09-03 19:10 UTCVendor advisory
  51. 2026-09-03 19:09 UTCGHSA enrichment
  52. 2026-09-03 06:00 UTCEG score recompute
  53. 2026-09-03 06:00 UTCVendor advisory
  54. 2026-09-03 06:00 UTCGHSA enrichment
  55. 2026-09-02 14:11 UTCEPSS rescore
  56. 2026-09-02 06:48 UTCVendor advisory
  57. 2026-09-02 06:47 UTCGHSA enrichment
  58. 2026-09-01 17:38 UTCEG score recompute
  59. 2026-09-01 17:38 UTCVendor advisory
  60. 2026-09-01 17:38 UTCGHSA enrichment
  61. 2026-09-01 13:53 UTCEPSS rescore
  62. 2026-09-01 04:39 UTCEPSS rescore
  63. 2026-08-31 22:28 UTCVendor advisory
  64. 2026-08-31 22:28 UTCGHSA enrichment
  65. 2026-08-31 01:08 UTCEG score recompute
  66. 2026-08-31 01:08 UTCVendor advisory
  67. 2026-08-31 01:08 UTCGHSA enrichment
  68. 2026-08-30 19:17 UTCEPSS rescore
  69. 2026-08-30 12:13 UTCEG score recompute
  70. 2026-08-30 12:13 UTCVendor advisory
  71. 2026-08-30 12:13 UTCGHSA enrichment
  72. 2026-08-30 01:22 UTCEPSS rescore
  73. 2026-08-29 23:18 UTCVendor advisory
  74. 2026-08-29 23:18 UTCGHSA enrichment
  75. 2026-08-29 10:24 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-20337?
CVE-2026-20337 is a high vulnerability published on August 7, 2026. A vulnerability in the zip archive parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper boundary checks for content in zip files during scanning, which may result in an out-of-bounds write condition.…
When was CVE-2026-20337 disclosed?
CVE-2026-20337 was first published in the National Vulnerability Database on August 7, 2026, with the most recent update on August 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20337 actively exploited?
CVE-2026-20337 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.7% of all scored CVEs.
What is the CVSS score of CVE-2026-20337?
CVE-2026-20337 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-20337?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20337, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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