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Vulnerability record · CVE-2021-25219 · published 27 October 2021

CVE-2021-25219: Isc bind vulnerability

Isc · Bind

In BIND 9.3.0 -> 9.11.35, 9.12.0 -> 9.16.21, and versions 9.9.3-S1 -> 9.11.35-S1 and 9.16.8-S1 -> 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.

5.3 CVSS 3.1 Medium EPSS 11% · top 4.4%
5.3CVSS 3.1 base score, v2 5.0
11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
15Affected product versions listed by NVD
20References
17 Jun 2026Last modified by NVD

Description

In BIND 9.3.0 -> 9.11.35, 9.12.0 -> 9.16.21, and versions 9.9.3-S1 -> 9.11.35-S1 and 9.16.8-S1 -> 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.

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

Affected products

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

References

LinkTags
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf PatchThird Party Advisory
https://kb.isc.org/v1/docs/cve-2021-25219 Vendor Advisory
https://lists.debian.org/debian-lts-announce/2021/11/msg00001.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EF4NAVRV4H3W4GA3LGGZYUK
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YGV7SA27CTYLGFJSPUM3V36
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTKC4E3HUOLYN5IA4EBL4VA
https://security.gentoo.org/glsa/202210-25 Third Party Advisory
https://security.netapp.com/advisory/ntap-20211118-0002/ Third Party Advisory
https://www.debian.org/security/2021/dsa-4994 Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf PatchThird Party Advisory
https://kb.isc.org/v1/docs/cve-2021-25219 Vendor Advisory
https://lists.debian.org/debian-lts-announce/2021/11/msg00001.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EF4NAVRV4H3W4GA3LGGZYUK
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YGV7SA27CTYLGFJSPUM3V36
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTKC4E3HUOLYN5IA4EBL4VA
https://security.gentoo.org/glsa/202210-25 Third Party Advisory
https://security.netapp.com/advisory/ntap-20211118-0002/ Third Party Advisory
https://www.debian.org/security/2021/dsa-4994 Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html Third Party Advisory

Track CVE-2021-25219 inside VULONE

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Source: NIST National Vulnerability Database (record CVE-2021-25219), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.