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Fencer Vulns
medium 4.3

CVE-2021-3622 json

A flaw was found in the hivex library.

published 2021-12-23 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26925

cvss
4.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.0%
EPSS 5.0% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

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.

Patch / fix

  • redhat hivex 1.3.21
  • hivex Debian 14, Debian 13, Debian 12 1.3.21-1

debian advisories DEBIAN-CVE-2021-3622

  • SLOF RHEL 8 20210217-1.module+el8.6.0+14480+c0a3aa0f
  • hivex RHEL 8 1.3.18-23.module+el8.6.0+14480+c0a3aa0f
  • netcf RHEL 8 0.2.8-12.module+el8.6.0+14480+c0a3aa0f
  • swtpm RHEL 8 0.7.0-1.20211109gitb79fd91.module+el8.6.0+14480+c0a3aa0f
  • libnbd RHEL 8 1.6.0-5.module+el8.6.0+14480+c0a3aa0f
  • nbdkit RHEL 8 1.24.0-4.module+el8.6.0+14480+c0a3aa0f
  • libtpms RHEL 8 0.9.1-0.20211126git1ff6fe1f43.module+el8.6.0+14480+c0a3aa0f
  • libvirt RHEL 8 8.0.0-5.module+el8.6.0+14480+c0a3aa0f

red hat advisories RHSA-2022:1759RHSA-2021:3338

  • hivex SLE Module for Development Tools 15 SP3, SLE Module for Development Tools 15 SP2, SLE Module for Basesystem 15 SP3 +3 more 1.3.14-5.6.1
  • hivex SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.3.10-5.7.1

suse advisories SUSE-SU-2021:3201-2SUSE-SU-2021:3210-1SUSE-SU-2021:3201-1

  • hivex openSUSE Tumbleweed 1.3.21-2.2
  • hivex openSUSE Leap 15.2 1.3.14-lp152.4.6.1
  • hivex openSUSE Leap 15.3 1.3.14-5.6.1

opensuse advisories openSUSE-SU-2024:10845-1openSUSE-SU-2021:1319-1openSUSE-SU-2021:3201-1

  • SLOF AlmaLinux 8 20210217-1.module_el8.6.0+2880+7d9e3703
  • hivex AlmaLinux 8 1.3.18-23.module_el8.6.0+2880+7d9e3703
  • netcf AlmaLinux 8 0.2.8-12.module_el8.6.0+2880+7d9e3703
  • swtpm AlmaLinux 8 0.7.0-1.20211109gitb79fd91.module_el8.6.0+2880+7d9e3703
  • libnbd AlmaLinux 8 1.6.0-5.module_el8.6.0+2880+7d9e3703
  • nbdkit AlmaLinux 8 1.24.0-4.module_el8.6.0+2880+7d9e3703
  • libtpms AlmaLinux 8 0.9.1-0.20211126git1ff6fe1f43.module_el8.6.0+2880+7d9e3703
  • libvirt AlmaLinux 8 8.0.0-5.module_el8.6.0+2880+7d9e3703

almalinux advisories ALSA-2022:1759

  • hivex Rocky Linux 8 1.3.18-23.module+el8.7.0+1084+97b81f61
  • hivex Rocky Linux 8 1.3.18-23.module+el8.6.0+847+b490afdd
  • netcf Rocky Linux 8 0.2.8-12.module+el8.7.0+1084+97b81f61
  • netcf Rocky Linux 8 0.2.8-12.module+el8.4.0+534+4680a14e
  • netcf Rocky Linux 8 0.2.8-12.module+el8.6.0+847+b490afdd
  • swtpm Rocky Linux 8 0.7.0-1.20211109gitb79fd91.module+el8.6.0+847+b490afdd
  • libnbd Rocky Linux 8 1.6.0-5.module+el8.7.0+1084+97b81f61
  • libnbd Rocky Linux 8 1.6.0-5.module+el8.6.0+847+b490afdd

rocky linux advisories RLSA-2022:1759

  • hivex CBL-Mariner 2.0 1.3.21-1

azure linux advisories AZL-7096

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • hivex Arch Linux 1.3.21-1

arch linux advisories AVG-2248

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3622 updated cvss 4.3

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

  • Red Hat Enterprise Linux 6 hivex, perl-hivex, ocaml-hivex, python-hivex
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 Advanced Virtualization hivex, perl-hivex, ruby-hivex, ocaml-hivex, python3-hivex
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 8) libnbd 1.6.0-5.module+el8.6.0+14480+c0a3aa0f, netcf 0.2.8-12.module+el8.6.0+14480+c0a3aa0f, hivex 1.3.18-23.module+el8.6.0+14480+c0a3aa0f, libvirt 8.0.0-5.module+el8.6.0+14480+c0a3aa0f, nbdfuse 1.6.0-5.module+el8.6.0+14480+c0a3aa0f, nbdkit 1.24.0-4.module+el8.6.0+14480+c0a3aa0f, +104 more
    fixed: vendor fix RHSA-2022:1759
  • Red Hat Enterprise Linux Client (v. 7) hivex 1.3.10-6.12.el7_9, perl-hivex 1.3.10-6.12.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) ruby-hivex 1.3.10-6.12.el7_9, ocaml-hivex 1.3.10-6.12.el7_9, python-hivex 1.3.10-6.12.el7_9
    fixed: vendor fix RHSA-2021:3338
  • Red Hat Enterprise Linux CRB (v. 8) libnbd 1.6.0-5.module+el8.6.0+14480+c0a3aa0f, netcf 0.2.8-12.module+el8.6.0+14480+c0a3aa0f, hivex 1.3.18-23.module+el8.6.0+14480+c0a3aa0f, libvirt 8.0.0-5.module+el8.6.0+14480+c0a3aa0f, nbdfuse 1.6.0-5.module+el8.6.0+14480+c0a3aa0f, SLOF 20210217-1.module+el8.6.0+14480+c0a3aa0f, +38 more
    fixed: vendor fix RHSA-2022:1759
  • Red Hat Enterprise Linux Server (v. 7) hivex 1.3.10-6.12.el7_9, perl-hivex 1.3.10-6.12.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) ruby-hivex 1.3.10-6.12.el7_9, ocaml-hivex 1.3.10-6.12.el7_9, python-hivex 1.3.10-6.12.el7_9 Red Hat Enterprise Linux Workstation (v. 7) hivex 1.3.10-6.12.el7_9, perl-hivex 1.3.10-6.12.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) ruby-hivex 1.3.10-6.12.el7_9, ocaml-hivex 1.3.10-6.12.el7_9, python-hivex 1.3.10-6.12.el7_9
    fixed: vendor fix RHSA-2021:3338
  • Red Hat Enterprise Linux 9 hivex, hivex-libs, perl-hivex, ruby-hivex, ocaml-hivex, python3-hivex
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.95% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=1975489 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

  • n/a hivex

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.