Vulnerability Report

CVE-2021-36976

Title: libarchive Use-After-Free

Use-After-Free

Proof Of Concept

No public PoC currently indexed for CVE-2021-36976.

CWE Category CWE-416
Published Date Jul 20, 2021
Modified Date Nov 03, 2025
Exploit Status Not Found
Score 6.5 CVSS v3.1
Exploit Probability (EPSS)
2.84%

Vulnerability Summary

CVE-2021-36976: libarchive 3.4.1 through 3.5.1 has a use-after-free in copy_string (called from do_uncompress_block and process_block).

Impacted Vendors

L
libarchive 1
S
splunk 1
F
freebsd 1

Reference Links

http://seclists.org/fulldisclosure/2022/Mar/27 http://seclists.org/fulldisclosure/2022/Mar/28 http://seclists.org/fulldisclosure/2022/Mar/29 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32375 https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libarchive/OSV-2021-557.yaml https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SE5NJQNM22ZE5Z55LPAGCUHSBQZBKMKC/ https://security.gentoo.org/glsa/202208-26 https://support.apple.com/kb/HT213182 https://support.apple.com/kb/HT213183 https://support.apple.com/kb/HT213193 http://seclists.org/fulldisclosure/2022/Mar/27 http://seclists.org/fulldisclosure/2022/Mar/28 http://seclists.org/fulldisclosure/2022/Mar/29 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32375 https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libarchive/OSV-2021-557.yaml https://lists.debian.org/debian-lts-announce/2024/11/msg00007.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SE5NJQNM22ZE5Z55LPAGCUHSBQZBKMKC/ https://security.gentoo.org/glsa/202208-26 https://support.apple.com/kb/HT213182 https://support.apple.com/kb/HT213183 https://support.apple.com/kb/HT213193
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
6.5
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
REQUIRED
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
4.3
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:M/Au:N/C:N/I:N/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-36976 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction REQUIRED
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected Stack

No specific products linked.