CVE-2021-1844

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: 2%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

A memory corruption issue was addressed with improved validation. This issue is fixed in iOS 14.4.1 and iPadOS 14.4.1, Safari 14.0.3 (v. 14610.4.3.1.7 and 15610.4.3.1.7), watchOS 7.3.2, macOS Big Sur 11.2.3. Processing maliciously crafted web content may lead to arbitrary code execution.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
83%
KEV
Not listed

Published

April 2, 2021

Last Modified

November 21, 2024

Advisory Details (8)

Auto-updated Aug 25, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

[SECURITY] Fedora 33 Update: webkit2gtk3-2.32.0-1.fc33 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/
generic🔴 Active Exploitation

Full Disclosure: APPLE-SA-2021-04-26-6 tvOS 14.5

http://seclists.org/fulldisclosure/2021/Apr/55
generic

[SECURITY] [DSA 4923-1] webkit2gtk security update

https://www.debian.org/security/2021/dsa-4923
generic

About the security content of tvOS 14.5 - Apple Support

https://support.apple.com/kb/HT212323
generic

About the security content of Safari 14.0.3 - Apple Support

https://support.apple.com/en-us/HT212223
generic

About the security content of watchOS 7.3.2 - Apple Support

https://support.apple.com/en-us/HT212222
generic

About the security content of iOS 14.4.1 and iPadOS 14.4.1 - Apple Support

https://support.apple.com/en-us/HT212221
generic

About the security content of macOS Big Sur 11.2.3 - Apple Support

https://support.apple.com/en-us/HT212220

Vendor Advisories for CVE-2021-1844(2)

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
ubuntuwebkit2gtk-driver (2.32.0-0ubuntu0.20.10.1) @ groovy2026-05-26ubuntu
redhatwebkitgtk4-0:2.48.3-2.el7_92025-07-07redhat
redhatwebkit2gtk3-0:2.32.3-2.el82021-11-09redhat

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 rangeFixed inDependents
webkit2gtk—2.32.0-2—
wpewebkit—2.32.0-2—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
webkit2gtk—2.32.0-2—
wpewebkit—2.32.0-2—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
webkit2gtk—2.32.0-2—
wpewebkit—2.32.0-2—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
webkit2gtk—2.32.0-2—
wpewebkit—2.32.0-2—
Debian:10(1)
PackageVulnerable rangeFixed inDependents
webkit2gtk2.24.2-1 ... 2.32.0-2 (81 versions)2.32.1-1~deb10u1—

Weakness Classification(2)

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

Additional Vendor Advisories

(1)

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 / 30× 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 162 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. 2026-09-16 14:05 UTCEPSS rescore
  5. 2026-09-16 14:04 UTCEPSS rescore
  6. 2026-09-15 03:06 UTCEPSS rescore
  7. 2026-09-13 16:43 UTCEPSS rescore
  8. 2026-09-12 14:57 UTCEPSS rescore
  9. 2026-09-11 09:33 UTCEPSS rescore
  10. 2026-09-10 09:29 UTCEPSS rescore
  11. 2026-09-08 21:56 UTCEPSS rescore
  12. 2026-09-07 15:58 UTCEPSS rescore
  13. 2026-09-06 20:01 UTCOSV refresh
  14. 2026-09-06 13:44 UTCEPSS rescore
  15. 2026-09-06 13:44 UTCEPSS rescore
  16. 2026-09-05 15:25 UTCEPSS rescore
  17. 2026-09-04 13:57 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. 2026-08-23 00:16 UTCEPSS rescore
  4. 2026-08-21 23:46 UTCEPSS rescore
  5. 2026-08-20 22:52 UTCEPSS rescore
  6. 2026-08-20 06:04 UTCOSV refresh
  7. 2026-08-19 17:01 UTCEPSS rescore
  8. 2026-08-18 13:45 UTCEPSS rescore
  9. 2026-08-17 13:43 UTCEPSS rescore
  10. 2026-08-16 14:52 UTCEPSS rescore
  11. 2026-08-16 02:11 UTCEPSS rescore
  12. 2026-08-15 01:27 UTCEPSS rescore
  13. 2026-08-13 21:57 UTCEPSS rescore
  14. 2026-08-12 13:47 UTCEPSS rescore
  15. 2026-08-11 13:38 UTCEPSS rescore
  16. 2026-08-09 13:43 UTCEPSS rescore
  17. 2026-08-08 16:33 UTCEPSS rescore
  18. 2026-08-07 16:23 UTCEPSS rescore
  19. 2026-08-06 13:43 UTCEPSS rescore
  20. 2026-08-05 19:14 UTCEPSS rescore
  21. 2026-08-05 01:10 UTCOSV refresh
  22. 2026-08-04 15:06 UTCEPSS rescore
  23. 2026-08-04 10:34 UTCEPSS rescore
  24. 2026-08-03 10:32 UTCEPSS rescore
  25. 2026-08-02 02:24 UTCEPSS rescore
  26. 2026-08-01 04:12 UTCEPSS rescore
  27. 2026-07-30 16:25 UTCEPSS rescore
  28. 2026-07-30 01:27 UTCEPSS rescore
  29. 2026-07-30 01:27 UTCEPSS rescore
  30. 2026-07-26 14:52 UTCEPSS rescore
  31. 2026-07-25 14:15 UTCEPSS rescore
  32. 2026-07-24 14:15 UTCEPSS rescore
  33. 2026-07-23 14:15 UTCEPSS rescore
  34. 2026-07-23 01:56 UTCEG score recompute
  35. 2026-07-22 22:43 UTCEG score recompute
  36. 2026-07-22 14:05 UTCEPSS rescore
  37. 2026-07-21 15:22 UTCEPSS rescore
  38. 2026-07-21 15:22 UTCEPSS rescore
  39. 2026-07-20 17:04 UTCEPSS rescore
  40. 2026-07-19 14:28 UTCEPSS rescore
  41. 2026-07-19 02:26 UTCEPSS rescore
  42. 2026-07-18 22:59 UTCOSV refresh
  43. 2026-07-18 10:02 UTCEPSS rescore
  44. 2026-07-16 17:00 UTCEPSS rescore
  45. 2026-07-15 16:55 UTCEPSS rescore
  46. 2026-07-15 16:55 UTCEPSS rescore
  47. 2026-07-15 01:57 UTCEPSS rescore
  48. 2026-07-13 22:27 UTCEPSS rescore
  49. 2026-07-13 22:27 UTCEPSS rescore
  50. 2026-07-13 06:10 UTCEPSS rescore
  51. 2026-07-13 06:10 UTCEPSS rescore
  52. 2026-07-12 05:44 UTCEPSS rescore
  53. 2026-07-12 05:44 UTCEPSS rescore
  54. 2026-07-11 08:25 UTCEPSS rescore
  55. 2026-07-09 19:07 UTCEPSS rescore
  56. 2026-07-08 15:12 UTCEPSS rescore
  57. 2026-07-07 13:43 UTCEPSS rescore
  58. 2026-07-06 16:25 UTCEPSS rescore
  59. 2026-07-06 02:21 UTCEPSS rescore
  60. 2026-07-06 02:21 UTCEPSS rescore
  61. 2026-07-05 02:28 UTCEPSS rescore
  62. 2026-07-05 02:28 UTCEPSS rescore
  63. 2026-07-04 06:29 UTCEPSS rescore
  64. 2026-07-04 06:29 UTCEPSS rescore
  65. 2026-07-02 16:57 UTCEPSS rescore
  66. 2026-07-01 15:03 UTCEPSS rescore
  67. 2026-07-01 06:18 UTCOSV refresh
  68. 2026-06-30 23:20 UTCEPSS rescore
  69. 2026-06-30 23:20 UTCEPSS rescore
  70. 2026-06-29 14:04 UTCEPSS rescore
  71. 2026-06-29 14:04 UTCEPSS rescore
  72. 2026-06-28 14:05 UTCEPSS rescore
  73. 2026-06-28 04:54 UTCEPSS rescore
  74. 2026-06-28 04:54 UTCEPSS rescore
  75. 2026-06-27 03:06 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-1844?
CVE-2021-1844 is a high vulnerability published on April 2, 2021. A memory corruption issue was addressed with improved validation. This issue is fixed in iOS 14.4.1 and iPadOS 14.4.1, Safari 14.0.3 (v. 14610.4.3.1.7 and 15610.4.3.1.7), watchOS 7.3.2, macOS Big Sur 11.2.3. Processing maliciously crafted web content may lead to arbitrary code execution.
When was CVE-2021-1844 disclosed?
CVE-2021-1844 was first published in the National Vulnerability Database on April 2, 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-2021-1844 actively exploited?
CVE-2021-1844 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 16.8% of all scored CVEs.
What is the CVSS score of CVE-2021-1844?
CVE-2021-1844 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2021-1844?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-1844, 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-2021-1844

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