CVE-2021-25220

BIND 9.11.0 -> 9.11.36 9.12.0 -> 9.16.26 9.17.0 -> 9.18.0 BIND Supported Preview Editions: 9.11.4-S1 -> 9.11.36-S1 9.16.8-S1 -> 9.16.26-S1 Versions of BIND 9 earlier than those shown - back to 9.1.0, including Supported Preview Editions - are also believed to be affected but have not been tested as they are EOL. The cache could become poisoned with incorrect records leading to queries being made to the wrong servers, which might also result in false information being returned to clients.

• CWE-444

• https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdfPatch, Third Party Advisory
• https://kb.isc.org/v1/docs/cve-2021-25220Mitigation, Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SXT7247QTKNBQ67MNRGZD23ADXU6E5U/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5VX3I2U3ICOIEI5Y7OYA6CHOLFMNH3YQ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/API7U5E7SX7BAAVFNW366FFJGD6NZZKV/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DE3UAVCPUMAKG27ZL5YXSP2C3RIOW3JZ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYD7US4HZRFUGAJ66ZTHFBYVP5N3OQBY/
• https://security.gentoo.org/glsa/202210-25Third Party Advisory
• https://security.netapp.com/advisory/ntap-20220408-0001/Third Party Advisory
• https://supportportal.juniper.net/s/article/2022-10-Security-Bulletin-Junos-OS-SRX-Series-Cache-poisoning-vulnerability-in-BIND-used-by-DNS-Proxy-CVE-2021-25220?language=en_US
• https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdfPatch, Third Party Advisory
• https://kb.isc.org/v1/docs/cve-2021-25220Mitigation, Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SXT7247QTKNBQ67MNRGZD23ADXU6E5U/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5VX3I2U3ICOIEI5Y7OYA6CHOLFMNH3YQ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/API7U5E7SX7BAAVFNW366FFJGD6NZZKV/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DE3UAVCPUMAKG27ZL5YXSP2C3RIOW3JZ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYD7US4HZRFUGAJ66ZTHFBYVP5N3OQBY/
• https://security.gentoo.org/glsa/202210-25Third Party Advisory
• https://security.netapp.com/advisory/ntap-20220408-0001/Third Party Advisory
• https://supportportal.juniper.net/s/article/2022-10-Security-Bulletin-Junos-OS-SRX-Series-Cache-poisoning-vulnerability-in-BIND-used-by-DNS-Proxy-CVE-2021-25220?language=en_US

Published

Mar 23, 2022

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.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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• CVE-2021-25214In BIND 9.8.5 -> 9.8.8, 9.9.3 -> 9.11.29, 9.12.0 -> 9.16.13,…6.5
• CVE-2021-25215In BIND 9.0.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BI…7.5
• CVE-2021-25216In BIND 9.5.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BI…9.8
• CVE-2021-25217In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4…7.4
• CVE-2021-25218In BIND 9.16.19, 9.17.16. Also, version 9.16.19-S1 of BIND S…7.5
• CVE-2021-25219In BIND 9.3.0 -> 9.11.35, 9.12.0 -> 9.16.21, and versions 9.…5.3
• CVE-2021-25221Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultID…
• CVE-2021-25222Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultID…
• CVE-2021-25223Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultID…
• CVE-2021-25224A memory exhaustion vulnerability in Trend Micro ServerProte…5.5
• CVE-2021-25225A memory exhaustion vulnerability in Trend Micro ServerProte…5.5
• CVE-2021-25226A memory exhaustion vulnerability in Trend Micro ServerProte…5.5