DNS forwarders - cache poisoning vulnerability
CVE-2021-25220

6.8MEDIUM

Key Information:

Vendor

Isc
Status
Bind
Vendor
CVE Published:
23 March 2022

What is 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.

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Affected Version(s)

BIND Open Source Branch 9.11 9.11.0 through versions before 9.11.37

BIND Development Branch 9.17 BIND 9.17 all version

BIND Open Source Branch 9.12-16 9.12.0 through versions before 9.16.27

References

https://kb.isc.org/v1/docs/cve-2021-25220
https://lists.fedoraproject.org/archives/list/package-ann...
vendor-advisory
https://lists.fedoraproject.org/archives/list/package-ann...
vendor-advisory

CVSS V3.1

Score:
6.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

ISC would like to thank Xiang Li, Baojun Liu, and Chaoyi Lu from Network and Information Security Lab, Tsinghua University and Changgen Zou from Qi An Xin Group Corp. for discovering and reporting this issue.
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