CVE-2021-30951

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 2.0% (80th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, 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: 2.0%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A use after free issue was addressed with improved memory management. This issue is fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS 15.2 and iPadOS 15.2, watchOS 8.3. Processing maliciously crafted web content may lead to arbitrary code execution.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
45
EG Risk 45/100CISA SSVC

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%
Exploitation2% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
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
2.0%
EPSS %ILE
80th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or 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 none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 24, 2021

Last Modified

November 21, 2024

Advisory Details (10)

Auto-updated Aug 24, 2026
Patch available.
generic

[SECURITY] [DSA 5061-1] wpewebkit security update

https://www.debian.org/security/2022/dsa-5061
generic

[SECURITY] [DSA 5060-1] webkit2gtk security update

https://www.debian.org/security/2022/dsa-5060
generic

About the security content of Safari 15.2 - Apple Support

https://support.apple.com/en-us/HT212982
generic

About the security content of tvOS 15.2 - Apple Support

https://support.apple.com/en-us/HT212980
generic

About the security content of macOS Monterey 12.1 - Apple Support

https://support.apple.com/en-us/HT212978
generic

About the security content of iOS 15.2 and iPadOS 15.2 - Apple Support

https://support.apple.com/en-us/HT212976
generic

About the security content of watchOS 8.3 - Apple Support

https://support.apple.com/en-us/HT212975
generic

[SECURITY] Fedora 34 Update: webkit2gtk3-2.34.4-1.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/
generic

[SECURITY] Fedora 35 Update: webkit2gtk3-2.34.4-2.fc35 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/
generic

oss-security - WebKitGTK and WPE WebKit Security Advisory WSA-2022-0001

http://www.openwall.com/lists/oss-security/2022/01/21/2

Vendor Advisories for CVE-2021-30951(1)

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

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibwebkit2gtk-4.0-dev (2.34.4-0ubuntu0.20.04.1) @ focal2026-05-23ubuntu
redhatwebkitgtk4-0:2.48.3-2.el7_92025-07-07redhat
redhatwebkit2gtk3-0:2.34.6-1.el82022-05-10redhat

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

(9 across 5 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk2.32.3-1 ... 2.34.4-1~deb10u1 (20 versions)
  • every version up to 2.34.4-1~deb11u1: fixed in 2.34.4-1~deb11u1
—
wpewebkit2.32.3-2 ... 2.34.3-1~deb11u1 (8 versions)
  • every version up to 2.34.4-1~deb11u1: fixed in 2.34.4-1~deb11u1
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk—
  • every version up to 2.34.4-1: fixed in 2.34.4-1
—
wpewebkit—
  • every version up to 2.34.4-1: fixed in 2.34.4-1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk—
  • every version up to 2.34.4-1: fixed in 2.34.4-1
—
wpewebkit—
  • every version up to 2.34.4-1: fixed in 2.34.4-1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk—
  • every version up to 2.34.4-1: fixed in 2.34.4-1
—
wpewebkit—
  • every version up to 2.34.4-1: fixed in 2.34.4-1
—
Debian:10(1)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk2.24.2-1 ... 2.34.3-1~deb11u1 (105 versions)
  • every version up to 2.34.4-1~deb10u1: fixed in 2.34.4-1~deb10u1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

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 8× 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 183 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2021-30951?
CVE-2021-30951 is a high vulnerability published on August 24, 2021. A use after free issue was addressed with improved memory management. This issue is fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS 15.2 and iPadOS 15.2, watchOS 8.3. Processing maliciously crafted web content may lead to arbitrary code execution.
When was CVE-2021-30951 disclosed?
CVE-2021-30951 was first published on August 24, 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-2021-30951 actively exploited?
CVE-2021-30951 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.0% probability of exploitation in the next 30 days (80th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-30951?
CVE-2021-30951 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2021-30951?
A fix for CVE-2021-30951 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2021-30951 are linked in the Vendor Advisories panel on this page.

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