CVE-2021-3622

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-12-23 · updated 2026-06-17
Weakness: CWE-400

Description

A flaw was found in the hivex library. This flaw allows an attacker to input a specially crafted Windows Registry (hive) file, which would cause hivex to recursively call the _get_children() function, leading to a stack overflow. The highest threat from this vulnerability is to system availability.

Affected products

Fedoraproject Fedora: 33, 34
Red Hat Enterprise Linux: 6.0, 7.0, 8.0
RedHat Enterprise Linux Workstation: 7.0
RedHat Hivex: before 1.3.21 — fixed in 1.3.21

How to fix

Upgrade to a fixed version: RedHat Hivex 1.3.21. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1975489
https://github.com/libguestfs/hivex/commit/771728218dac2fbf6997a7e53225e75a4c6b7255
https://listman.redhat.com/archives/libguestfs/2021-August/msg00002.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/S35TVTAPHORSUIFYNFBHKLQRPVFUPXBE/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/USD4OEV6L3RPHE32V2MJ4JPFBODINWSU/
https://bugzilla.redhat.com/show_bug.cgi?id=1975489
https://github.com/libguestfs/hivex/commit/771728218dac2fbf6997a7e53225e75a4c6b7255
https://listman.redhat.com/archives/libguestfs/2021-August/msg00002.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/S35TVTAPHORSUIFYNFBHKLQRPVFUPXBE/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/USD4OEV6L3RPHE32V2MJ4JPFBODINWSU/

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