🛡️ CVE-2023-50868 on Ubuntu — bind9

Distribution advisory

This page covers CVE-2023-50868 as tracked by Ubuntu, for the package bind9. The fix is available in version 1:9.18.18-0ubuntu0.22.04.2; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

• Attack vector: Network — reachable from anywhere that can route to the service.
• Attack complexity: Low — the attack works reliably, with no preparation.
• Privileges required: None — an unauthenticated stranger can try it.
• User interaction: None — nobody has to be tricked into anything.
• Scope: Unchanged — the damage stays inside the vulnerable component.
• Confidentiality impact: None.
• Integrity impact: None.
• Availability impact: High — total loss, or loss the attacker controls.

Weakness class

UBUNTU-CVE-2023-50868 is classified as CWE-400: Uncontrolled Resource Consumption. A request can consume memory, CPU or storage without limit, exhausting capacity for everyone else.

Affected software

UBUNTU-CVE-2023-50868 is recorded against 7 packages.

• bind9 (fixed in 1:9.18.18-0ubuntu0.22.04.2)
• bind9-libs
• dnsmasq (fixed in 2.90-0ubuntu0.22.04.1)
• isc-dhcp
• knot-resolver
• pdns-recursor
• unbound (fixed in 1.19.1-1ubuntu1)

Timeline and source

Published on 13 February 2024 and last revised on 2 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
kb.isc.org (Report)
lists.thekelleys.org.uk (Report)
www.knot-resolver.cz (Report)
blog.powerdns.com (Report)
nlnetlabs.nl (Report)
nlnetlabs.nl (Report)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
www.cve.org (Report)
ubuntu.com (Advisory)

Other advisories for this package

bind9 has other advisories on record. If you are patching this one, these are worth checking on the same host:

• ROOT-OS-DEBIAN-11-CVE-2025-40777 (8.0 High, published 20 Aug 2026)
• ROOT-OS-DEBIAN-11-CVE-2022-2881 (8.0 High, published 20 Aug 2026)
• ECHO-ed2d-c1b0-5e9e (published 23 Jul 2026)
• ECHO-6d4b-e3ee-0962 (published 23 Jul 2026)
• ECHO-6303-1fdb-ed48 (published 23 Jul 2026)
• ECHO-d56a-90b8-201c (published 23 Jul 2026)
• ECHO-fcc4-5d8a-b7af (published 23 Jul 2026)
• ECHO-d176-cede-4ce1 (published 23 Jul 2026)

Same weakness in other software

These advisories are the same class of weakness (CWE-400: Uncontrolled Resource Consumption) in other software:

• CVE-2024-25039 (7.5 High, published 30 Jul 2026)
• CVE-2024-24769 (2.0 Low, published 13 Jul 2026)
• CVE-2022-21732 (5.0 Medium, published 9 Jul 2026)
• CVE-2022-23591 (8.0 High, published 9 Jul 2026)
• CVE-2023-46104 (5.0 Medium, published 7 Jul 2026)
• CVE-2024-10821 (8.0 High, published 7 Jul 2026)
• CVE-2024-12778 (8.0 High, published 7 Jul 2026)
• CVE-2024-10713 (8.0 High, published 7 Jul 2026)

CVE-2023-50868 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Affected Packages

References