CVE-2021-33643

CRITICAL

libtar <= 1.2.21 - Out-of-Bounds Read via Crafted Tar File

Title source: llm

Description

An attacker who submits a crafted tar file with size in header struct being 0 may be able to trigger an calling of malloc(0) for a variable gnu_longlink, causing an out-of-bounds read.

References (7)

Core 7

Core References

Mailing List, Third Party Advisory vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5YSHZY753R7XW6CIKJVAWI373WW3YRRJ/

Mailing List

https://lists.debian.org/debian-lts-announce/2025/01/msg00026.html

Broken Link, Third Party Advisory

https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1807

Mailing List, Third Party Advisory vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OD4HEBSTI22FNYKOKK7W3X6ZQE6FV3XC/

Mailing List, Third Party Advisory vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7Q26QDNOJDOFYWMJWEIK5XR62M2FF6IJ/

Mailing List, Third Party Advisory vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S4PJRCJLEAWN2EKXGLSOBTL7O57V7NC/

Mailing List, Third Party Advisory vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7WX5YE66CT7Y5C2HTHXSFDKQWYWYWJ2T/

Scores

CVSS v3 9.1

EPSS 0.0133

EPSS Percentile 67.6%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-125

Status published

Products (7)

None/libtar <1.2.21

fedoraproject/fedora 35

fedoraproject/fedora 36

fedoraproject/fedora 37

feep/libtar < 1.2.21

openatom/openeuler 20.03 sp1 (2 CPE variants)

openatom/openeuler 22.03

Published Aug 10, 2022

Tracked Since Feb 18, 2026