CVE-2021-28831

· HIGHModified

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CVSS v3.1

7.5

EPSS

2.72%

Published

Mar 19, 2021

Modified

Dec 17, 2025

Public PoC / Exploit (1)

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Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

Description

decompress_gunzip.c in BusyBox through 1.32.1 mishandles the error bit on the huft_build result pointer, with a resultant invalid free or segmentation fault, via malformed gzip data.

CVSS Vector

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

Weaknesses (CWE)

CWE-755CWE-755

Affected Products (5)

busybox · busyboxvulnerable

fedoraproject · fedoravulnerable

debian · debian_linuxvulnerable

References (14)

https://git.busybox.net/busybox/commit/?id=f25d254dfd4243698c31a4f3153d4ac72aa9e9bd

Mailing ListPatchVendor Advisory

https://lists.debian.org/debian-lts-announce/2021/04/msg00001.html

Mailing ListThird Party Advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3UDQGJRECXFS5EZVDH2OI45FMO436AC4/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7ZIFKPRR32ZYA3WAA2NXFA3QHHOU6FJ/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZASBW7QRRLY5V2R44MQ4QQM4CZIDHM2U/

https://security.gentoo.org/glsa/202105-09

Third Party Advisory