CVE-2023-2911 Denial of service in BIND 9

What is CVE-2023-2911?

CVE-2023-2911 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 21 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

If the `recursive-clients` quota is reached on a BIND 9 resolver configured with both `stale-answer-enable yes;` and `stale-answer-client-timeout 0;`, a sequence of serve-stale-related lookups could cause `named` to loop and terminate unexpectedly due to a stack overflow. This issue affects BIND 9 versions 9.16.33 through 9.16.41, 9.18.7 through 9.18.15, 9.16.33-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-S1.

Weakness: CWE-787

Which versions are affected by CVE-2023-2911?

It affects 9 products.

Products include Debian Debian Linux, Fedoraproject Fedora, Isc Bind, Netapp Active Iq Unified Manager, Netapp H300s Firmware, Netapp H410c Firmware and 3 more.

How do I fix CVE-2023-2911?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-2911 being exploited?

There is no known exploitation of CVE-2023-2911 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2023-2911, AZL-27237, DEBIAN-CVE-2023-2911, GHSA-rrr5-v5h9-fpwp, UBUNTU-CVE-2023-2911.