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Fencer Vulns
high 7.5

CVE-2023-5517 json

Querying RFC 1918 reverse zones may cause an assertion failure when "nxdomain-redirect" is enabled

published 2024-02-13 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-57830

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

A flaw in query-handling code can cause `named` to exit prematurely with an assertion failure when:

- `nxdomain-redirect <domain>;` is configured, and - the resolver receives a PTR query for an RFC 1918 address that would normally result in an authoritative NXDOMAIN response. This issue affects BIND 9 versions 9.12.0 through 9.16.45, 9.18.0 through 9.18.21, 9.19.0 through 9.19.19, 9.16.8-S1 through 9.16.45-S1, and 9.18.11-S1 through 9.18.21-S1.

Patch / fix

  • isc bind 9.16.48, 9.16.48-S1, 9.18.24, 9.18.24-S1, 9.19.21
  • bind9 Debian 12 1:9.18.24-1
  • bind9 Debian 14, Debian 13 1:9.19.21-1

debian advisories DEBIAN-CVE-2023-5517

  • bind9 Ubuntu 20.04 LTS 1:9.16.48-0ubuntu0.20.04.1
  • bind9 Ubuntu 22.04 LTS 1:9.18.18-0ubuntu0.22.04.2

ubuntu advisories UBUNTU-CVE-2023-5517

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

  • bind RHEL 9 32:9.16.23-18.el9_4.1
  • bind-libs RHEL 9 32:9.16.23-18.el9_4.1
  • bind-utils RHEL 9 32:9.16.23-18.el9_4.1
  • bind-chroot RHEL 9 32:9.16.23-18.el9_4.1
  • bind-license RHEL 9 32:9.16.23-18.el9_4.1
  • python3-bind RHEL 9 32:9.16.23-18.el9_4.1
  • bind-dyndb-ldap RHEL 9 11.9-9.el9_4
  • bind-dnssec-utils RHEL 9 32:9.16.23-18.el9_4.1

red hat advisories RHSA-2024:2551RHSA-2024:1800RHSA-2024:1803RHSA-2024:1789RHSA-2024:1781RHSA-2024:1647

  • bind SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS +1 more 9.16.6-150000.12.74.2
  • libuv SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS +1 more 1.18.0-150000.3.2.1
  • bind SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Module for Basesystem 15 SP6 +2 more 9.16.6-150300.22.44.1
  • bind SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +3 more 9.16.48-150400.5.40.1
  • bind SLE Module for Server Applications 15 SP5, SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 9.16.48-150500.8.16.1

suse advisories SUSE-SU-2024:2033-1SUSE-SU-2024:1982-1SUSE-SU-2024:0590-1SUSE-SU-2024:0574-1

  • bind openSUSE Tumbleweed 9.18.24-1.1

opensuse advisories openSUSE-SU-2024:13687-1

  • bind AlmaLinux 9 32:9.16.23-18.el9_4.1
  • bind-libs AlmaLinux 9 32:9.16.23-18.el9_4.1
  • bind-utils AlmaLinux 9 32:9.16.23-18.el9_4.1
  • bind-chroot AlmaLinux 9 32:9.16.23-18.el9_4.1
  • bind-license AlmaLinux 9 32:9.16.23-18.el9_4.1
  • python3-bind AlmaLinux 9 32:9.16.23-18.el9_4.1
  • bind-dyndb-ldap AlmaLinux 9 11.9-9.el9_4.alma.1
  • bind-dnssec-utils AlmaLinux 9 32:9.16.23-18.el9_4.1

almalinux advisories ALSA-2024:2551ALSA-2024:1781ALSA-2024:1789

  • bind Rocky Linux 9 2:9.16.23-18.el9_4.1
  • bind-dyndb-ldap Rocky Linux 9 11.9-9.el9_4
  • bind9.16 Rocky Linux 8 2:9.16.23-0.16.el8_9.2

rocky linux advisories RLSA-2024:2551RLSA-2024:1781

  • bind Alpine 3.16 9.16.48-r0
  • bind Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 9.18.24-r0

alpine advisories ALPINE-CVE-2023-5517

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 9.16.48-1
  • bind Azure Linux 3.0 9.19.21-1

azure linux advisories AZL-34354AZL-34563

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-2023-5517 updated cvss 7.5

bind9: Querying RFC 1918 reverse zones may cause an assertion failure when “nxdomain-redirect” is enabled

  • Red Hat Enterprise Linux 10 bind
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder (v. 8) bind9.16-libs 9.16.23-0.16.el8_9.2
    fixed: vendor fix RHSA-2024:1781
  • Red Hat CodeReady Linux Builder (v. 9) bind-libs 9.16.23-14.el9_3.4
    fixed: vendor fix RHSA-2024:1789
  • Red Hat CodeReady Linux Builder EUS (v.8.6) bind9.16-libs 9.16.23-0.7.el8_6.5, python3-bind9.16 9.16.23-0.7.el8_6.5, bind9.16-dnssec-utils 9.16.23-0.7.el8_6.5
    fixed: vendor fix RHSA-2024:1647
  • Red Hat CodeReady Linux Builder EUS (v.8.8) bind9.16-libs 9.16.23-0.14.el8_8.4
    fixed: vendor fix RHSA-2024:1648
  • Red Hat CodeReady Linux Builder EUS (v.9.0) bind-libs 9.16.23-1.el9_0.5
    fixed: vendor fix RHSA-2024:1800
  • Red Hat CodeReady Linux Builder EUS (v.9.2) bind-libs 9.16.23-11.el9_2.4
    fixed: vendor fix RHSA-2024:1803
  • Red Hat Enterprise Linux AppStream (v. 8) bind9.16 9.16.23-0.16.el8_9.2, bind9.16-libs 9.16.23-0.16.el8_9.2, bind9.16-utils 9.16.23-0.16.el8_9.2, bind9.16-chroot 9.16.23-0.16.el8_9.2, bind9.16-license 9.16.23-0.16.el8_9.2, python3-bind9.16 9.16.23-0.16.el8_9.2, +1 more
    fixed: vendor fix RHSA-2024:1781
show 7 more
  • Red Hat Enterprise Linux AppStream (v. 9) bind 9.16.23-14.el9_3.4, bind 9.16.23-18.el9_4.1, bind-dyndb-ldap 11.9-9.el9_4, bind-libs 9.16.23-14.el9_3.4, bind-libs 9.16.23-18.el9_4.1, bind-utils 9.16.23-14.el9_3.4, +10 more
    fixed: vendor fix RHSA-2024:1789
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) bind9.16 9.16.23-0.7.el8_6.5, bind9.16-libs 9.16.23-0.7.el8_6.5, bind9.16-utils 9.16.23-0.7.el8_6.5, bind9.16-chroot 9.16.23-0.7.el8_6.5, bind9.16-license 9.16.23-0.7.el8_6.5
    fixed: vendor fix RHSA-2024:1647
  • Red Hat Enterprise Linux AppStream EUS (v.8.8) bind9.16 9.16.23-0.14.el8_8.4, bind9.16-libs 9.16.23-0.14.el8_8.4, bind9.16-utils 9.16.23-0.14.el8_8.4, bind9.16-chroot 9.16.23-0.14.el8_8.4, bind9.16-license 9.16.23-0.14.el8_8.4, python3-bind9.16 9.16.23-0.14.el8_8.4, +1 more
    fixed: vendor fix RHSA-2024:1648
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) bind 9.16.23-1.el9_0.5, bind-libs 9.16.23-1.el9_0.5, bind-utils 9.16.23-1.el9_0.5, bind-chroot 9.16.23-1.el9_0.5, bind-dyndb-ldap 11.9-7.el9_0.1, bind-license 9.16.23-1.el9_0.5, +2 more
    fixed: vendor fix RHSA-2024:1800
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) bind 9.16.23-11.el9_2.4, bind-libs 9.16.23-11.el9_2.4, bind-utils 9.16.23-11.el9_2.4, bind-chroot 9.16.23-11.el9_2.4, bind-dyndb-ldap 11.9-8.el9_2.2, bind-license 9.16.23-11.el9_2.4, +2 more
    fixed: vendor fix RHSA-2024:1803
  • Red Hat Enterprise Linux CRB (v. 9) bind-libs 9.16.23-18.el9_4.1
    fixed: vendor fix RHSA-2024:2551
  • 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
2 y ago

Exploit prediction

1.28% chance of exploitation in the next 30 days, higher than 70% 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

Affected products

  • ISC BIND 9
  • 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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.