CVE-2021-30547

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 4%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

Out of bounds write in ANGLE in Google Chrome prior to 91.0.4472.101 allowed a remote attacker to potentially perform out of bounds memory access via a crafted HTML page.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity88% × 45%
Exploitation4% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
4%
EPSS %ILE
89%
KEV
Not listed

Published

June 15, 2021

Last Modified

November 21, 2024

Advisory Details (10)

Auto-updated Aug 24, 2026
⚠️ Active exploitation confirmed. Patch available.
generic

[SECURITY] [DSA 4940-1] thunderbird security update

https://www.debian.org/security/2021/dsa-4940
generic

[SECURITY] [DSA 4939-1] firefox-esr security update

https://www.debian.org/security/2021/dsa-4939
generic

Mozilla Thunderbird: Multiple Vulnerabilities (GLSA 202208-14) — Gentoo security

https://security.gentoo.org/glsa/202208-14
generic

Mozilla Firefox: Multiple vulnerabilities (GLSA 202202-03) — Gentoo security

https://security.gentoo.org/glsa/202202-03
generic

[SECURITY] Fedora 34 Update: chromium-91.0.4472.114-1.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/
generic

[SECURITY] Fedora 33 Update: chromium-91.0.4472.114-2.fc33 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/
generic Patch Available

[SECURITY] [DLA 2711-1] thunderbird security update

https://lists.debian.org/debian-lts-announce/2021/07/msg00010.html
generic Patch Available

[SECURITY] [DLA 2709-1] firefox-esr security update

https://lists.debian.org/debian-lts-announce/2021/07/msg00009.html
generic
https://crbug.com/1210414
generic🔴 Active Exploitation

Chrome Releases: Stable Channel Update for Desktop

https://chromereleases.googleblog.com/2021/06/stable-channel-update-for-desktop.html

Vendor Advisories for CVE-2021-30547(2)

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

Patch Availability(10)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox-mozsymbols (90.0+build1-0ubuntu0.21.04.1) @ hirsute2026-05-26ubuntu
ubuntuthunderbird-locale-id (1:78.13.0+build1-0ubuntu0.21.04.2) @ hirsute2026-05-26ubuntu
redhatthunderbird-0:78.12.0-2.el8_22021-07-27redhat
redhatthunderbird-0:78.12.0-3.el8_42021-07-26redhat
redhatthunderbird-0:78.12.0-2.el8_12021-07-26redhat
redhatthunderbird-0:78.12.0-2.el7_92021-07-26redhat
redhatfirefox-0:78.12.0-1.el8_42021-07-15redhat
redhatfirefox-0:78.12.0-1.el8_12021-07-15redhat
redhatfirefox-0:78.12.0-1.el8_22021-07-15redhat
redhatfirefox-0:78.12.0-1.el7_92021-07-15redhat

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

(16 across 6 ecosystems)
Debian:11(3)
PackageVulnerable rangeFixed inDependents
chromium90.0.4430.212-193.0.4577.82-1—
firefox-esr—78.12.0esr-1—
thunderbird—1:78.12.0-1—
Debian:12(3)
PackageVulnerable rangeFixed inDependents
chromium—93.0.4577.82-1—
firefox-esr—78.12.0esr-1—
thunderbird—1:78.12.0-1—
Debian:13(3)
PackageVulnerable rangeFixed inDependents
chromium—93.0.4577.82-1—
firefox-esr—78.12.0esr-1—
thunderbird—1:78.12.0-1—
Debian:14(3)
PackageVulnerable rangeFixed inDependents
chromium—93.0.4577.82-1—
firefox-esr—78.12.0esr-1—
thunderbird—1:78.12.0-1—
Debian:10(2)
PackageVulnerable rangeFixed inDependents
firefox-esr60.7.2esr-1 ... 78.9.0esr-1~deb9u1 (102 versions)78.12.0esr-1~deb10u1—
thunderbird1:60.7.2-1 ... 1:78.9.0-1~deb9u1 (123 versions)1:78.12.0-1~deb10u1—
Debian:9(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.9.0esr-1 ... 78.9.0esr-1~deb9u1 (209 versions)78.12.0esr-1~deb9u1—
thunderbird1.5-4 ... 1:78.9.0-1~deb9u1 (204 versions)1:78.12.0-1~deb9u1—

Weakness Classification(1)

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

Additional Vendor Advisories

(9)

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 7× in last 7d / 31× 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 161 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
  4. 2026-09-17 19:23 UTCEPSS rescore
  5. 2026-09-16 14:05 UTCEPSS rescore
  6. 2026-09-15 03:06 UTCEPSS rescore
  7. 2026-09-15 03:06 UTCEPSS rescore
  8. 2026-09-12 14:57 UTCEPSS rescore
  9. 2026-09-11 14:49 UTCEPSS rescore
  10. 2026-09-11 09:33 UTCEPSS rescore
  11. 2026-09-08 21:56 UTCEPSS rescore
  12. 2026-09-07 15:58 UTCEPSS rescore
  13. 2026-09-06 15:01 UTCOSV refresh
  14. 2026-09-06 13:44 UTCEPSS rescore
  15. 2026-09-05 15:25 UTCEPSS rescore
  16. 2026-09-04 13:57 UTCEPSS rescore
  17. 2026-09-04 05:03 UTCEPSS rescore
  18. 2026-09-04 05:03 UTCEPSS rescore
  19. 2026-09-02 14:08 UTCEPSS rescore
  20. 2026-09-01 13:50 UTCEPSS rescore
  21. 2026-09-01 03:32 UTCEPSS rescore
  22. 2026-08-30 19:14 UTCEPSS rescore
  23. 2026-08-30 01:19 UTCEPSS rescore
  24. 2026-08-28 21:37 UTCEPSS rescore
  25. 2026-08-27 14:22 UTCEPSS rescore
Show 75 more
  1. 2026-08-26 14:42 UTCEPSS rescore
  2. 2026-08-25 13:45 UTCEPSS rescore
  3. 2026-08-24 14:12 UTCEPSS rescore
  4. 2026-08-23 00:16 UTCEPSS rescore
  5. 2026-08-21 23:46 UTCEPSS rescore
  6. 2026-08-20 22:52 UTCEPSS rescore
  7. 2026-08-20 01:15 UTCOSV refresh
  8. 2026-08-19 17:01 UTCEPSS rescore
  9. 2026-08-18 13:45 UTCEPSS rescore
  10. 2026-08-17 13:44 UTCEPSS rescore
  11. 2026-08-16 14:53 UTCEPSS rescore
  12. 2026-08-16 02:11 UTCEPSS rescore
  13. 2026-08-16 02:11 UTCEPSS rescore
  14. 2026-08-15 01:27 UTCEPSS rescore
  15. 2026-08-13 21:57 UTCEPSS rescore
  16. 2026-08-12 13:47 UTCEPSS rescore
  17. 2026-08-11 13:38 UTCEPSS rescore
  18. 2026-08-08 16:33 UTCEPSS rescore
  19. 2026-08-07 16:23 UTCEPSS rescore
  20. 2026-08-06 13:43 UTCEPSS rescore
  21. 2026-08-05 19:14 UTCEPSS rescore
  22. 2026-08-04 20:18 UTCOSV refresh
  23. 2026-08-04 15:06 UTCEPSS rescore
  24. 2026-08-04 10:34 UTCEPSS rescore
  25. 2026-08-03 10:33 UTCEPSS rescore
  26. 2026-08-02 02:24 UTCEPSS rescore
  27. 2026-08-01 04:13 UTCEPSS rescore
  28. 2026-07-30 16:25 UTCEPSS rescore
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  30. 2026-07-30 01:28 UTCEPSS rescore
  31. 2026-07-30 01:27 UTCEPSS rescore
  32. 2026-07-28 15:33 UTCEPSS rescore
  33. 2026-07-26 14:52 UTCEPSS rescore
  34. 2026-07-26 14:52 UTCEPSS rescore
  35. 2026-07-25 14:15 UTCEPSS rescore
  36. 2026-07-24 14:15 UTCEPSS rescore
  37. 2026-07-23 14:16 UTCEPSS rescore
  38. 2026-07-23 02:00 UTCEG score recompute
  39. 2026-07-22 22:47 UTCEG score recompute
  40. 2026-07-22 14:06 UTCEPSS rescore
  41. 2026-07-22 14:06 UTCEPSS rescore
  42. 2026-07-21 15:22 UTCEPSS rescore
  43. 2026-07-21 15:22 UTCEPSS rescore
  44. 2026-07-20 17:05 UTCEPSS rescore
  45. 2026-07-19 14:28 UTCEPSS rescore
  46. 2026-07-19 02:27 UTCEPSS rescore
  47. 2026-07-19 02:27 UTCEPSS rescore
  48. 2026-07-18 18:29 UTCOSV refresh
  49. 2026-07-18 10:02 UTCEPSS rescore
  50. 2026-07-18 10:02 UTCEPSS rescore
  51. 2026-07-16 17:00 UTCEPSS rescore
  52. 2026-07-15 16:55 UTCEPSS rescore
  53. 2026-07-15 16:55 UTCEPSS rescore
  54. 2026-07-15 01:58 UTCEPSS rescore
  55. 2026-07-13 22:27 UTCEPSS rescore
  56. 2026-07-13 22:27 UTCEPSS rescore
  57. 2026-07-12 05:44 UTCEPSS rescore
  58. 2026-07-12 05:44 UTCEPSS rescore
  59. 2026-07-11 08:25 UTCEPSS rescore
  60. 2026-07-11 08:25 UTCEPSS rescore
  61. 2026-07-09 19:07 UTCEPSS rescore
  62. 2026-07-08 15:12 UTCEPSS rescore
  63. 2026-07-06 16:25 UTCEPSS rescore
  64. 2026-07-06 16:25 UTCEPSS rescore
  65. 2026-07-06 02:21 UTCEPSS rescore
  66. 2026-07-06 02:21 UTCEPSS rescore
  67. 2026-07-05 02:28 UTCEPSS rescore
  68. 2026-07-04 06:29 UTCEPSS rescore
  69. 2026-07-04 06:29 UTCEPSS rescore
  70. 2026-07-02 16:57 UTCEPSS rescore
  71. 2026-07-01 15:03 UTCEPSS rescore
  72. 2026-07-01 01:18 UTCOSV refresh
  73. 2026-06-30 23:20 UTCEPSS rescore
  74. 2026-06-30 23:20 UTCEPSS rescore
  75. 2026-06-29 14:04 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-30547?
CVE-2021-30547 is a high vulnerability published on June 15, 2021. Out of bounds write in ANGLE in Google Chrome prior to 91.0.4472.101 allowed a remote attacker to potentially perform out of bounds memory access via a crafted HTML page.
When was CVE-2021-30547 disclosed?
CVE-2021-30547 was first published in the National Vulnerability Database on June 15, 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-2021-30547 actively exploited?
CVE-2021-30547 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4% probability of exploitation in the next 30 days, which ranks it in the top 11.1% of all scored CVEs.
What is the CVSS score of CVE-2021-30547?
CVE-2021-30547 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2021-30547?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30547, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-30547

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