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ExploitedIn CISA KEVFix available

CVE-2020-27950

Exploitation confirmed. First attested on 2021-11-03 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2020-12-08
  • Fixed in7.1 · 6.2.9 · 5.3.9
  • WeaknessCWE-665

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A memory initialization issue was addressed. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 5.3.9, macOS Catalina 10.15.7 Supplemental Update, macOS Catalina 10.15.7 Update. A malicious application may be able to disclose kernel memory.

Timeline

dates in UTC
  1. 2020-12-0821:15CVE publishedNVD
  2. 2021-11-03Added to the CISA KEV catalogCISA KEV
  3. 2021-11-03Listed as exploited by GCVEGCVE
  4. 2021-11-03Exploitation first reportedCISA KEV
  5. 2025-01-2917:35SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-04 03:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-27950?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-27950?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Apple watchos
BranchAffectedFixed in
7.x≥ 7.0, < 7.17.1
6.x≥ 6.0, < 6.2.96.2.9
5.3< 5.3.95.3.9
Apple iphone os
BranchAffectedFixed in
14.x≥ 14.0, < 14.214.2
12.4< 12.4.912.4.9
Apple macos
BranchAffectedFixed in
11.0≥ 11.0, < 11.0.111.0.1
10.15< 10.15.710.15.7

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA8 products

As apple, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Apple watchOS
    Affected
    • < 7.1fixed in 7.1custom
  • Apple iOS and iPadOS
    Affected
    • < 14.2fixed in 14.2custom
  • Apple macOS
    Affected
    • < 11.0fixed in 11.0custom
  • Apple macOS
    Affected
    • < 12.4fixed in 12.4custom
  • Apple macOS
    Affected
    • < 6.2fixed in 6.2custom
  • Apple macOS
    Affected
    • < 5.3fixed in 5.3custom

2 more products in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2021-02-05

Fix

  1. Update Apple watchos to 7.1 · 6.2.9 · 5.3.9
  2. CISA’s required action: Apply updates per vendor instructions.due 2022-05-03

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
2 repositories, unverifiedsynacktiv/CVE-2020-27950lyonzon2/browser-crash-tool
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2021-11-03
Patch Due Date
2022-05-03
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Published
2020-12-08
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-76v6-7m6g-p6v4

Frequently asked questions

What is CVE-2020-27950?

A memory initialization issue was addressed. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 5.3.9, macOS Catalina 10.15.7 Supplemental Update, macOS Catalina 10.15.7 Update. A malicious application may be able to disclose kernel memory.

Is CVE-2020-27950 actively exploited?

Yes. CVE-2020-27950 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-05-03.

What is the CVSS score for CVE-2020-27950?

CVE-2020-27950 has a CVSS v3 base score of 5.5 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

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Sources for this record