CVE-2021-25219

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.

• https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch, Third Party Advisory
• https://kb.isc.org/v1/docs/cve-2021-25219Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2021/11/msg00001.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EF4NAVRV4H3W4GA3LGGZYUKD3HSJBAVW/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YGV7SA27CTYLGFJSPUM3V36ZWK7WWDI4/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTKC4E3HUOLYN5IA4EBL4VAQSWG2ZVTX/
• https://security.gentoo.org/glsa/202210-25Third Party Advisory
• https://security.netapp.com/advisory/ntap-20211118-0002/Third Party Advisory
• https://www.debian.org/security/2021/dsa-4994Third Party Advisory
• https://www.oracle.com/security-alerts/cpuapr2022.htmlThird Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch, Third Party Advisory
• https://kb.isc.org/v1/docs/cve-2021-25219Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2021/11/msg00001.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EF4NAVRV4H3W4GA3LGGZYUKD3HSJBAVW/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YGV7SA27CTYLGFJSPUM3V36ZWK7WWDI4/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTKC4E3HUOLYN5IA4EBL4VAQSWG2ZVTX/
• https://security.gentoo.org/glsa/202210-25Third Party Advisory
• https://security.netapp.com/advisory/ntap-20211118-0002/Third Party Advisory
• https://www.debian.org/security/2021/dsa-4994Third Party Advisory
• https://www.oracle.com/security-alerts/cpuapr2022.htmlThird Party Advisory

Published

Oct 27, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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