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Vulnerability record · CVE-2023-2911 · published 21 June 2023

CVE-2023-2911: Isc bind out-of-bounds write vulnerability

Isc · Bind

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.

7.5 CVSS 3.1 High EPSS 2.5% · top 16.2% CWE-787 · Out-of-bounds write
7.5CVSS 3.1 base score
2.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

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.

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

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2023/06/21/6 Mailing ListPatchThird Party Advisory
https://kb.isc.org/docs/cve-2023-2911 Vendor Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/SEFCEVCTYEMKTWA7V7EYPI5YQ Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/U3K6AJK7RRSR53HRF5GGKPA6P Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20230703-0010/ Third Party Advisory
https://www.debian.org/security/2023/dsa-5439 Third Party Advisory
http://www.openwall.com/lists/oss-security/2023/06/21/6 Mailing ListPatchThird Party Advisory
https://kb.isc.org/docs/cve-2023-2911 Vendor Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/SEFCEVCTYEMKTWA7V7EYPI5YQ Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/U3K6AJK7RRSR53HRF5GGKPA6P Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20230703-0010/ Third Party Advisory
https://www.debian.org/security/2023/dsa-5439 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2023-2911), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.