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Vulnerability record · CVE-2021-23177 · published 23 August 2022

CVE-2021-23177: Libarchive link following vulnerability

Libarchive · Libarchive

An improper link resolution flaw while extracting an archive can lead to changing the access control list (ACL) of the target of the link. An attacker may provide a malicious archive to a victim user, who would trigger this flaw when trying to extract the archive. A local attacker may use this flaw to change the ACL of a file on the system and gain more privileges.

7.8 CVSS 3.1 High EPSS 0.39% · top 69.8% CWE-59 · Link following
7.8CVSS 3.1 base score
0.39%EPSS exploitation probability, 30 days
NoNot in CISA KEV
13Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

An improper link resolution flaw while extracting an archive can lead to changing the access control list (ACL) of the target of the link. An attacker may provide a malicious archive to a victim user, who would trigger this flaw when trying to extract the archive. A local attacker may use this flaw to change the ACL of a file on the system and gain more privileges.

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

Affected products

13 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/security/cve/CVE-2021-23177 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2024245 Issue TrackingPatchThird Party Advisory
https://github.com/libarchive/libarchive/commit/fba4f123cc456d2b2538f811bb831483bf336bad PatchThird Party Advisory
https://github.com/libarchive/libarchive/issues/1565 Issue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00030.html Mailing ListThird Party Advisory
https://access.redhat.com/security/cve/CVE-2021-23177 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2024245 Issue TrackingPatchThird Party Advisory
https://github.com/libarchive/libarchive/commit/fba4f123cc456d2b2538f811bb831483bf336bad PatchThird Party Advisory
https://github.com/libarchive/libarchive/issues/1565 Issue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00030.html Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-23177), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.