CVE-2021-28831

busybox: invalid free or segmentation fault via malformed gzip data

Published Mar 19, 2021 CVSS 3.1 · 7.5 High EPSS 2.7% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-2614-1 busybox security update
Debian DLA Debian DLA DLA-4019-1 busybox security update
EUVD EUVD EUVD-2021-15487 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.
Ubuntu USN Ubuntu USN USN-5179-1 BusyBox vulnerabilities
Ubuntu USN Ubuntu USN USN-5179-2 BusyBox vulnerability
Ubuntu USN Ubuntu USN USN-6335-1 BusyBox vulnerabilities
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Dec 17, 2025, 9:57 PM
Reserved
Mar 19, 2021, 12:00 AM
Status
Modified
Published
Mar 19, 2021, 5:15 AM
Modified
Jun 17, 2026, 3:46 AM
Severity
Moderate
Public date
Mar 12, 2021, 12:00 AM