CVE-2021-30475

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.8Exploit: None knownExposed: 0

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

aom_dsp/noise_model.c in libaom in AOMedia before 2021-03-24 has a buffer overflow.

CVSS v3
9.8
EG Score
9.8(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
Severity98% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
82%
KEV
Not listed

Published

June 4, 2021

Last Modified

November 21, 2024

Advisory Details (6)

Auto-updated Sep 19, 2026
Patch available.
generic

[SECURITY] Fedora 34 Update: aom-3.1.1-1.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZXCI33HXH6YSOGC2LPE2REQLMIDH6US4/
generic Patch Available

[SECURITY] [DLA 3556-1] aom security update

https://lists.debian.org/debian-lts-announce/2023/09/msg00003.html
generic
https://bugs.chromium.org/p/aomedia/issues/detail?id=2999
generic

12adc723acf02633595a4d8da8345742729f46c0 - aom - Git at Google

https://aomedia.googlesource.com/aom/+/12adc723acf02633595a4d8da8345742729f46c0
generic

[SECURITY] [DSA 5490-1] aom security update

https://www.debian.org/security/2023/dsa-5490
generic

libaom: Multiple Vulnerabilities (GLSA 202401-32) — Gentoo security

https://security.gentoo.org/glsa/202401-32

Affected Packages

(13 across 13 ecosystems)
Alpine:v3.17(1)
PackageVulnerable rangeFixed inDependents
aom—3.1.1-r0—
Alpine:v3.18(1)
PackageVulnerable rangeFixed inDependents
aom—3.1.1-r0—
Alpine:v3.19(1)
PackageVulnerable rangeFixed inDependents
aom—3.1.1-r0—
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
aom—3.1.1-r0—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
aom—3.1.1-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
aom—3.1.1-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
aom—3.1.1-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
aom—3.1.1-r0—
Debian:10(1)
PackageVulnerable rangeFixed inDependents
aom1.0.0-31.0.0-3+deb10u1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
aom1.0.0.errata1-31.0.0.errata1-3+deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
aom—3.2.0-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
aom—3.2.0-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
aom—3.2.0-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 29× 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 163 total refreshes for this CVE.

  1. 2026-09-19 15:37 UTCEPSS rescore
  2. 2026-09-18 19:23 UTCEPSS rescore
  3. 2026-09-17 19:23 UTCEPSS rescore
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  13. 2026-09-06 16:01 UTCOSV refresh
  14. 2026-09-06 13:44 UTCEPSS rescore
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  24. 2026-08-28 21:37 UTCEPSS rescore
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  1. 2026-08-26 14:42 UTCEPSS rescore
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  5. 2026-08-21 23:46 UTCEPSS rescore
  6. 2026-08-20 22:52 UTCEPSS rescore
  7. 2026-08-20 02:04 UTCOSV refresh
  8. 2026-08-19 17:01 UTCEPSS rescore
  9. 2026-08-18 13:45 UTCEPSS rescore
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  11. 2026-08-16 14:53 UTCEPSS rescore
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  21. 2026-08-06 13:43 UTCEPSS rescore
  22. 2026-08-05 19:14 UTCEPSS rescore
  23. 2026-08-04 20:57 UTCOSV refresh
  24. 2026-08-04 15:06 UTCEPSS rescore
  25. 2026-08-04 10:34 UTCEPSS rescore
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  27. 2026-08-02 02:24 UTCEPSS rescore
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  38. 2026-07-23 14:16 UTCEPSS rescore
  39. 2026-07-23 02:00 UTCEG score recompute
  40. 2026-07-22 22:47 UTCEG score recompute
  41. 2026-07-22 14:06 UTCEPSS rescore
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  43. 2026-07-21 15:22 UTCEPSS rescore
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  45. 2026-07-20 17:05 UTCEPSS rescore
  46. 2026-07-19 14:28 UTCEPSS rescore
  47. 2026-07-19 02:27 UTCEPSS rescore
  48. 2026-07-19 02:27 UTCEPSS rescore
  49. 2026-07-18 18:59 UTCOSV refresh
  50. 2026-07-18 10:02 UTCEPSS rescore
  51. 2026-07-18 10:02 UTCEPSS rescore
  52. 2026-07-16 17:00 UTCEPSS rescore
  53. 2026-07-15 16:55 UTCEPSS rescore
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  55. 2026-07-15 01:58 UTCEPSS rescore
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  63. 2026-07-09 19:07 UTCEPSS rescore
  64. 2026-07-08 15:12 UTCEPSS rescore
  65. 2026-07-07 13:43 UTCEPSS rescore
  66. 2026-07-06 16:25 UTCEPSS rescore
  67. 2026-07-06 16:25 UTCEPSS rescore
  68. 2026-07-06 02:21 UTCEPSS rescore
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  70. 2026-07-05 02:28 UTCEPSS rescore
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  73. 2026-07-02 16:57 UTCEPSS rescore
  74. 2026-07-01 15:03 UTCEPSS rescore
  75. 2026-07-01 01:48 UTCOSV refresh

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-30475?
CVE-2021-30475 is a critical vulnerability published on June 4, 2021. aomdsp/noisemodel.c in libaom in AOMedia before 2021-03-24 has a buffer overflow.
When was CVE-2021-30475 disclosed?
CVE-2021-30475 was first published in the National Vulnerability Database on June 4, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-30475 actively exploited?
CVE-2021-30475 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 18.1% of all scored CVEs.
What is the CVSS score of CVE-2021-30475?
CVE-2021-30475 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-30475?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30475, 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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