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Fencer Vulns
high 7.5

CVE-2022-3924 in the critical feed json

named configured to answer from stale cache may terminate unexpectedly at recursive-clients soft quota

published 2023-01-25 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-43258

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
16.0%
EPSS 16.0% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

This issue can affect BIND 9 resolvers with `stale-answer-enable yes;` that also make use of the option `stale-answer-client-timeout`, configured with a value greater than zero.

If the resolver receives many queries that require recursion, there will be a corresponding increase in the number of clients that are waiting for recursion to complete. If there are sufficient clients already waiting when a new client query is received so that it is necessary to SERVFAIL the longest waiting client (see BIND 9 ARM `recursive-clients` limit and soft quota), then it is possible for a race to occur between providing a stale answer to this older client and sending an early timeout SERVFAIL, which may cause an assertion failure. This issue affects BIND 9 versions 9.16.12 through 9.16.36, 9.18.0 through 9.18.10, 9.19.0 through 9.19.8, and 9.16.12-S1 through 9.16.36-S1.

Patch / fix

  • isc bind 9.16.37, 9.18.11, 9.19.9
  • bind9 Debian 14, Debian 13, Debian 12 1:9.18.11-1

debian advisories DEBIAN-CVE-2022-3924

  • bind9 Ubuntu 22.04 LTS 1:9.18.1-1ubuntu1.3

ubuntu advisories UBUNTU-CVE-2022-3924

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

  • bind9.16 RHEL 8 32:9.16.23-0.14.el8
  • bind9.16-libs RHEL 8 32:9.16.23-0.14.el8
  • bind9.16-utils RHEL 8 32:9.16.23-0.14.el8
  • bind9.16-chroot RHEL 8 32:9.16.23-0.14.el8
  • bind9.16-license RHEL 8 32:9.16.23-0.14.el8
  • python3-bind9.16 RHEL 8 32:9.16.23-0.14.el8
  • bind9.16-dnssec-utils RHEL 8 32:9.16.23-0.14.el8
  • bind RHEL 9 32:9.16.23-11.el9

red hat advisories RHSA-2023:2792RHSA-2023:2261

  • bind SLE Module for Server Applications 15 SP4, SLE Module for Basesystem 15 SP4, openSUSE Leap 15.4 9.16.37-150400.5.17.1

suse advisories SUSE-SU-2023:0341-1

  • bind openSUSE Tumbleweed 9.18.11-1.1

opensuse advisories openSUSE-SU-2024:12641-1

  • bind9.16 AlmaLinux 8 32:9.16.23-0.14.el8
  • bind9.16-libs AlmaLinux 8 32:9.16.23-0.14.el8
  • bind9.16-utils AlmaLinux 8 32:9.16.23-0.14.el8
  • bind9.16-chroot AlmaLinux 8 32:9.16.23-0.14.el8
  • bind9.16-license AlmaLinux 8 32:9.16.23-0.14.el8
  • python3-bind9.16 AlmaLinux 8 32:9.16.23-0.14.el8
  • bind9.16-dnssec-utils AlmaLinux 8 32:9.16.23-0.14.el8
  • bind AlmaLinux 9 32:9.16.23-11.el9

almalinux advisories ALSA-2023:2792ALSA-2023:2261

  • bind Alpine 3.16, Alpine 3.15, Alpine 3.14 9.16.37-r0
  • bind Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 9.18.11-r0

alpine advisories ALPINE-CVE-2022-3924

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • bind CBL-Mariner 2.0 9.16.37-2

azure linux advisories AZL-13227

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-2022-3924 updated cvss 7.5

bind: sending specific queries to the resolver may cause a DoS

  • Red Hat Enterprise Linux AppStream (v. 8) bind9.16 9.16.23-0.14.el8, bind9.16-libs 9.16.23-0.14.el8, bind9.16-utils 9.16.23-0.14.el8, bind9.16-chroot 9.16.23-0.14.el8, bind9.16-license 9.16.23-0.14.el8, python3-bind9.16 9.16.23-0.14.el8, +1 more
    fixed: vendor fix RHSA-2023:2792
  • Red Hat Enterprise Linux AppStream (v. 9) bind 9.16.23-11.el9, bind-libs 9.16.23-11.el9, bind-utils 9.16.23-11.el9, bind-chroot 9.16.23-11.el9, bind-license 9.16.23-11.el9, python3-bind 9.16.23-11.el9, +1 more
    fixed: vendor fix RHSA-2023:2261
  • Red Hat Enterprise Linux CRB (v. 8) bind9.16-libs 9.16.23-0.14.el8
    fixed: vendor fix RHSA-2023:2792
  • Red Hat Enterprise Linux CRB (v. 9) bind-libs 9.16.23-11.el9
    fixed: vendor fix RHSA-2023:2261
  • Red Hat Enterprise Linux 6 bind, bind-sdb, bind-libs, bind-utils, bind-chroot Red Hat Enterprise Linux 7 bind, bind-sdb, bind-libs, bind-utils, bind-chroot, bind-pkcs11, +6 more Red Hat Enterprise Linux 8 bind, bind-sdb, bind-libs, bind-utils, bind-chroot, bind-pkcs11, +7 more Red Hat Enterprise Linux 9 dhcp, dhcp-relay, dhcp-client, dhcp-common, dhcp-server
    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
none
Automatable
yes
Technical impact
partial
Assessed
19 mo ago

Exploit prediction

15.99% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • ISC BIND 9

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.