CVE-2020-27950

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2021-11-03. Federal remediation due 2022-05-03.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

16.52% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 96.8% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2020-12-08 20:17Z5 YR AGO

Last updated

2025-10-21 23:35Z10 MO AGO

Reserved

2020-10-27

Assigning CNA

apple

Record state

PUBLISHED

Severity

Medium (CVSS 5.5)

CNA CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Weaknesses

• CWE-665Improper InitializationClass

Data version

5.1

Document digest

7ce9450c8b4eafdf78bc01ca30e11b4b43fb3d1e4796a509ceed07cf141e7167

• support.apple.comhttps://support.apple.com/en-us/HT211931x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT211928x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT211929x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT211940x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT211944x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT211945x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT211946x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT211947x_refsource_MISC
• seclists.org20201215 APPLE-SA-2020-12-14-4 Additional information for APPLE-SA-2020-11-13-1 macOS Big Sur 11.0.1http://seclists.org/fulldisclosure/2020/Dec/32mailing-listx_refsource_FULLDISC
• packetstormsecurity.comhttp://packetstormsecurity.com/files/161296/XNU-Kernel-Mach-Message-Trailers-Memory-Disclosure.htmlx_refsource_MISC
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-27950government-resource