What is CVE-2021-36976?

CVE-2021-36976 is a medium-severity software vulnerability (Use-after-free) with a CVSS score of 6.5. libarchive 3.4.1 through 3.5.1 has a use-after-free in copy_string (called from do_uncompress_block and process_block).

Is CVE-2021-36976 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 3%.

What products does CVE-2021-36976 affect?

Tracked products affected include macOS, Apple iOS, Fedora. Check the version you run to see whether it is affected.

How do I fix CVE-2021-36976?

Apply the vendor fix in your normal patch cycle. Upgrade affected products to a fixed version.

← All products

CVE-2021-36976

MEDIUM severity · CVSS 6.5 · Use-after-free

6.5CVSS MEDIUM

Summary

libarchive 3.4.1 through 3.5.1 has a use-after-free in copy_string (called from do_uncompress_block and process_block).

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionRequired

Confidentiality impactNone

Integrity impactNone

Availability impactHigh

Exploit probability (EPSS)3%

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

Affected products we track (3)

macOS Apple iOS Fedora

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Additional information

NVD record
http://seclists.org/fulldisclosure/2022/Mar/27Advisory
http://seclists.org/fulldisclosure/2022/Mar/28Advisory
http://seclists.org/fulldisclosure/2022/Mar/29Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32375Advisory
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libarchive/OSV-2021-557.yamlAdvisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SE5NJQNM22ZE5Z55LPAGCUHSBQZBKMKC/Advisory
https://security.gentoo.org/glsa/202208-26Advisory
https://support.apple.com/kb/HT213182Advisory