Skip to content
Fencer Vulns
low 2.8

CVE-2024-43167 json

Unbound: null pointer dereference in unbound

published 2024-08-08 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-40093

cvss
2.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits
0
none known

Summary

DISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original software developer, NLnet Labs) falls within the expected functionality and security controls of the application. Red Hat has made a claim that there is a security risk within Red Hat products. NLnet Labs has no further information about the claim, and suggests that affected Red Hat customers refer to available Red Hat documentation or support channels. ORIGINAL DESCRIPTION: A NULL pointer dereference flaw was found in the ub_ctx_set_fwd function in Unbound. This issue could allow an attacker who can invoke specific sequences of API calls to cause a segmentation fault. When certain API functions such as ub_ctx_set_fwd and ub_ctx_resolvconf are called in a particular order, the program attempts to read from a NULL pointer, leading to a crash. This issue can result in a denial of service by causing the application to terminate unexpectedly.

Patch / fix

  • unbound Debian 12 1.17.1-2+deb12u3
  • unbound Debian 14, Debian 13 1.21.1-1

debian advisories DEBIAN-CVE-2024-43167

  • unbound Ubuntu 20.04 LTS 1.9.4-2ubuntu1.8
  • unbound Ubuntu 22.04 LTS 1.13.1-1ubuntu5.7
  • unbound Ubuntu 24.04 LTS 1.19.2-1ubuntu3.2
  • unbound Ubuntu Pro 14.04 LTS 1.4.22-1ubuntu4.14.04.3+esm1
  • unbound Ubuntu Pro 16.04 LTS 1.5.8-1ubuntu1.1+esm1
  • unbound Ubuntu Pro 18.04 LTS 1.6.7-1ubuntu2.6+esm2

ubuntu advisories UBUNTU-CVE-2024-43167

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • unbound SLE Module for Package Hub 15 SP6, SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 1.20.0-150600.23.6.1
  • unbound SLE Module for Package Hub 15 SP5, SLE Module for Basesystem 15 SP5, SLE Micro 5.5 +1 more 1.20.0-150100.10.16.1

suse advisories SUSE-SU-2024:3111-1SUSE-SU-2024:3074-1

  • unbound openSUSE Tumbleweed 1.21.0-1.1

opensuse advisories openSUSE-SU-2024:14270-1

  • unbound Azure Linux 3.0 1.19.1-4
  • unbound CBL-Mariner 2.0 1.19.1-3

azure linux advisories AZL-47771AZL-47779

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

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-2024-43167 updated cvss 2.8

unbound: NULL Pointer Dereference in Unbound

  • Red Hat Enterprise Linux 6 unbound, unbound-libs, unbound-python Red Hat Enterprise Linux 7 unbound, unbound-libs, unbound-python
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 unbound, unbound-libs, python3-unbound Red Hat Enterprise Linux 9 unbound, unbound-libs, unbound-dracut, python3-unbound Red Hat Enterprise Linux 10 unbound Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenStack Platform 18.0 openstack-unbound-container
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenStack Platform 16.2 openstack-unbound-container Red Hat OpenStack Platform 17.1 openstack-unbound-container
    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

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 2.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L

Affected products

  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenStack Platform 16.2
  • Red Hat Red Hat OpenStack Platform 17.1
  • Red Hat Red Hat OpenStack Platform 18.0

Classification

Weakness

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.