CVE-2021-28831

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 1.40% Top 25%
Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory gentoo.org Vendor Advisory busybox.net
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://git.busybox.net/busybox/commit/?id=f25d254dfd4243698c31a4f3153d4ac72aa9e9bd patch vendor advisory mailing list
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZASBW7QRRLY5V2R44MQ4QQM4CZIDHM2U/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7ZIFKPRR32ZYA3WAA2NXFA3QHHOU6FJ/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3UDQGJRECXFS5EZVDH2OI45FMO436AC4/ vendor advisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00001.html third party advisory mailing list
https://security.gentoo.org/glsa/202105-09 third party advisory vendor advisory
https://security.netapp.com/advisory/ntap-20250509-0005/

Frequently Asked Questions

What is the severity of CVE-2021-28831?
CVE-2021-28831 has been scored as a high severity vulnerability.
How to fix CVE-2021-28831?
To fix CVE-2021-28831, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-28831 being actively exploited in the wild?
It is possible that CVE-2021-28831 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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