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Vulnerability record · CVE-2021-25214 · published 29 April 2021

CVE-2021-25214: Isc bind vulnerability

Isc · Bind

In BIND 9.8.5 -> 9.8.8, 9.9.3 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.9.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND 9 Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.11 of the BIND 9.17 development branch, when a vulnerable version of named receives a malformed IXFR triggering the flaw described above, the named process will terminate due to a failed assertion the next time the transferred secondary zone is refreshed.

6.5 CVSS 3.1 Medium EPSS 6.0% · top 6.9% CWE-617 · CWE-617
6.5CVSS 3.1 base score, v2 4.0
6.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
15Affected product versions listed by NVD
22References
17 Jun 2026Last modified by NVD

Description

In BIND 9.8.5 -> 9.8.8, 9.9.3 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.9.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND 9 Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.11 of the BIND 9.17 development branch, when a vulnerable version of named receives a malformed IXFR triggering the flaw described above, the named process will terminate due to a failed assertion the next time the transferred secondary zone is refreshed.

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

Affected products

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

References

LinkTags
http://www.openwall.com/lists/oss-security/2021/04/29/1 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/04/29/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/04/29/3 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/04/29/4 Mailing ListThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf PatchThird Party Advisory
https://kb.isc.org/v1/docs/cve-2021-25214 Vendor Advisory
https://lists.debian.org/debian-lts-announce/2021/05/msg00001.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VEC2XG4Q2ODTN2C4CGXEIXU
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDSRPCJQ7MZC6CENH5PO3VQ
https://security.netapp.com/advisory/ntap-20210521-0006/ Third Party Advisory
https://www.debian.org/security/2021/dsa-4909 Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/04/29/1 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/04/29/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/04/29/3 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/04/29/4 Mailing ListThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf PatchThird Party Advisory
https://kb.isc.org/v1/docs/cve-2021-25214 Vendor Advisory
https://lists.debian.org/debian-lts-announce/2021/05/msg00001.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VEC2XG4Q2ODTN2C4CGXEIXU
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDSRPCJQ7MZC6CENH5PO3VQ
https://security.netapp.com/advisory/ntap-20210521-0006/ Third Party Advisory
https://www.debian.org/security/2021/dsa-4909 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-25214), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.