CVE-2021-30952

HIGHNVD 7.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-03-05), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, nvd
Trending — 4 sources updated this weekExploited in the wild
7.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 8%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

An integer overflow was addressed with improved input validation. 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
7.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
93.9%
KEV
⚠ Exploited

Published

August 24, 2021

Last Modified

March 6, 2026

Advisory Details (10)

Auto-updated Jun 4, 2026
No patch confirmed yet.
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-2021-30952(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 / EcosystemFixed in / PatchReleasedSource
ubuntulibwebkit2gtk-4.0-dev (2.34.4-0ubuntu0.21.10.1) @ impish2026-07-22ubuntu
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.

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 66× in last 7d / 259× 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 464 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2021-30952?
CVE-2021-30952 is a high vulnerability published on August 24, 2021. An integer overflow was addressed with improved input validation. 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-2021-30952 disclosed?
CVE-2021-30952 was first published in the National Vulnerability Database on August 24, 2021, with the most recent update on March 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-30952 actively exploited?
Yes. CISA added CVE-2021-30952 to the Known Exploited Vulnerabilities catalog on March 5, 2026, affecting Apple Multiple Products. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-30952?
CVE-2021-30952 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2021-30952?
CVE-2021-30952 affects Apple Multiple Products. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2021-30952?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30952, 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

Explore the affected products and dependency analysis for CVE-2021-30952

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