CVE-2023-2911

Name: CVE-2023-2911
Creator: NVD / NIST
Published: 2023-06-21T17:15:47.827+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.57%

Last modified Jun 17, 2026

CVE-2023-2911 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 2.57% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

2.57%

83.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Isc	Bind	>= 9.16.33, <= 9.16.41
Isc	Bind	>= 9.18.7, <= 9.18.15
Isc	Bind	>= 9.18.11, <= 9.18.15
Debian	Debian Linux	11.0
Debian	Debian Linux	12.0
Fedoraproject	Fedora	37
Fedoraproject	Fedora	38
Netapp	Active Iq Unified Manager	All versions
Netapp	H700s Firmware	All versions
Netapp	H300s Firmware	All versions
Netapp	H410c Firmware	All versions
Netapp	H410s Firmware	All versions
Netapp	H500s Firmware	All versions

References

http://www.openwall.com/lists/oss-security/2023/06/21/6Mailing List, Patch, Third Party Advisory
https://kb.isc.org/docs/cve-2023-2911Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SEFCEVCTYEMKTWA7V7EYPI5YQQ4JWDLI/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U3K6AJK7RRSR53HRF5GGKPA6PDUDWOD2/Mailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20230703-0010/Third Party Advisory
https://www.debian.org/security/2023/dsa-5439Third Party Advisory
http://www.openwall.com/lists/oss-security/2023/06/21/6Mailing List, Patch, Third Party Advisory
https://kb.isc.org/docs/cve-2023-2911Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SEFCEVCTYEMKTWA7V7EYPI5YQQ4JWDLI/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U3K6AJK7RRSR53HRF5GGKPA6PDUDWOD2/Mailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20230703-0010/Third Party Advisory
https://www.debian.org/security/2023/dsa-5439Third Party Advisory

Timeline

Published: Jun 21, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-2911?

How severe is CVE-2023-2911?

CVE-2023-2911 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.57% probability of exploitation in the next 30 days.

How do I fix CVE-2023-2911?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-2911?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST