CVE-2020-27918

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.4%CVSS: 7.8Exploit: 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 macOS Big Sur 11.0.1, watchOS 7.1, iOS 14.2 and iPadOS 14.2, iCloud for Windows 11.5, Safari 14.0.1, tvOS 14.2, iTunes 12.11 for Windows. Processing maliciously crafted web content may lead to arbitrary code execution.

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA 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
Severity78% × 45%
Exploitation1% × 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
1.4%
EPSS %ILE
72nd
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

December 8, 2020

Last Modified

November 21, 2024

Advisory Details (10)

Auto-updated Sep 23, 2026
⚠️ Active exploitation confirmed. Patch available.
generic🔴 Active Exploitation

About the security content of macOS Big Sur 11.0.1 - Apple Support

https://support.apple.com/en-us/HT211931
generic

About the security content of tvOS 14.2 - Apple Support

https://support.apple.com/en-us/HT211930
generic🔴 Active Exploitation

About the security content of iOS 14.2 and iPadOS 14.2 - Apple Support

https://support.apple.com/en-us/HT211929
generic🔴 Active Exploitation

About the security content of watchOS 7.1 - Apple Support

https://support.apple.com/en-us/HT211928
generic

WebkitGTK+: Multiple vulnerabilities (GLSA 202104-03) — Gentoo security

https://security.gentoo.org/glsa/202104-03
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

[SECURITY] Fedora 32 Update: webkit2gtk3-2.30.6-1.fc32 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ/
generic

[SECURITY] Fedora 34 Update: webkit2gtk3-2.32.0-1.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EQ3U3VBSOJB46WCO66TEWE5OAXLTU3YW/
generic🔴 Active Exploitation

oss-security - WebKitGTK and WPE WebKit Security Advisory WSA-2021-0002

http://www.openwall.com/lists/oss-security/2021/03/22/1
generic🔴 Active Exploitation

Full Disclosure: APPLE-SA-2020-12-14-4 Additional information for APPLE-SA-2020-11-13-1 macOS Big Sur 11.0.1

http://seclists.org/fulldisclosure/2020/Dec/32

Vendor Advisories for CVE-2020-27918(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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntuwebkit2gtk-driver (2.30.6-0ubuntu0.20.10.1) @ groovy2026-05-23ubuntu
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 rangeFix by version rangeDependents
webkit2gtk—
  • every version up to 2.30.6-1: fixed in 2.30.6-1
—
wpewebkit—
  • every version up to 2.30.6-1: fixed in 2.30.6-1
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk—
  • every version up to 2.30.6-1: fixed in 2.30.6-1
—
wpewebkit—
  • every version up to 2.30.6-1: fixed in 2.30.6-1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk—
  • every version up to 2.30.6-1: fixed in 2.30.6-1
—
wpewebkit—
  • every version up to 2.30.6-1: fixed in 2.30.6-1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk—
  • every version up to 2.30.6-1: fixed in 2.30.6-1
—
wpewebkit—
  • every version up to 2.30.6-1: fixed in 2.30.6-1
—
Debian:10(1)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk2.24.2-1 ... 2.30.5-1~deb10u1 (74 versions)
  • every version up to 2.30.6-1~deb10u1: fixed in 2.30.6-1~deb10u1
—

Weakness Classification(1)

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 5× in last 7d / 24× 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 158 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2020-27918?
CVE-2020-27918 is a high vulnerability published on December 8, 2020. A use after free issue was addressed with improved memory management. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 14.2 and iPadOS 14.2, iCloud for Windows 11.5, Safari 14.0.1, tvOS 14.2, iTunes 12.11 for Windows. Processing maliciously crafted web content may lead to arbitrary…
When was CVE-2020-27918 disclosed?
CVE-2020-27918 was first published on December 8, 2020, 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-2020-27918 actively exploited?
CVE-2020-27918 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.4% probability of exploitation in the next 30 days (72nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-27918?
CVE-2020-27918 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2020-27918?
A fix for CVE-2020-27918 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2020-27918 are linked in the Vendor Advisories panel on this page.

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