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MEDIUM

CVE-2021-3622

CVSS v3

4.3

MEDIUM

EPSS Score

5.2 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • hivexAlmaLinux:8all versions · fixed in 1.3.18-23.module_el8.6.0+2880+7d9e3703and 6 other packages
  • libguestfsAlmaLinux:8all versions · fixed in 1:1.44.0-5.module_el8.6.0+2880+7d9e3703.almaand 24 other packages
  • libguestfs-winsupportAlmaLinux:8all versions · fixed in 8.6-1.module_el8.6.0+2880+7d9e3703
  • libiscsiAlmaLinux:8all versions · fixed in 1.18.0-8.module_el8.6.0+2880+7d9e3703and 2 other packages
  • libnbdAlmaLinux:8all versions · fixed in 1.6.0-5.module_el8.6.0+2880+7d9e3703and 6 other packages
  • libtpmsAlmaLinux:8all versions · fixed in 0.9.1-0.20211126git1ff6fe1f43.module_el8.6.0+2880+7d9e3703and 1 other package
  • libvirtAlmaLinux:8all versions · fixed in 8.0.0-5.module_el8.6.0+2880+7d9e3703and 27 other packages
  • libvirt-dbusAlmaLinux:8all versions · fixed in 1.3.0-2.module_el8.6.0+2880+7d9e3703

10 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-3622 Red Hat Product Security1,002 products fixed · 31 known affected

    hivex: stack overflow due to recursive call of _get_children()

    hivex as a component of Red Hat Enterprise Linux 6 · hivex-devel as a component of Red Hat Enterprise Linux 6 · hivex.src as a component of Red Hat Enterprise Linux 6

  • RHSA-2022:1759 Red Hat Product Security938 products fixed

    Red Hat Security Advisory: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update

  • RHSA-2021:3338 Red Hat Product Security64 products fixed

    Red Hat Security Advisory: hivex security update

Full record on NVD

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.

Technical details

Published
2021-12-23

Frequently asked questions

What is CVE-2021-3622?

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.

Is CVE-2021-3622 actively exploited?

Active exploitation of CVE-2021-3622 has not been confirmed. Its EPSS score was 5.2% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-3622?

CVE-2021-3622 has a CVSS v3 base score of 4.3 (MEDIUM severity).

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