An assertion check can fail while answering queries for DNAME records that require the DNAME to be processed to resolve itself

CVE-2021-25215
7.5HIGH

Key Information

Vendor
Isc
Status
Bind9
Vendor
CVE Published:
29 April 2021

Badges

👾 Exploit Exists

Summary

In BIND 9.0.0 -> 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 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 query for a record triggering the flaw described above, the named process will terminate due to a failed assertion check. The vulnerability affects all currently maintained BIND 9 branches (9.11, 9.11-S, 9.16, 9.16-S, 9.17) as well as all other versions of BIND 9.

Affected Version(s)

BIND9 = Open Source Branches 9.0 through 9.11 9.0.0 through versions before 9.11.30

BIND9 = Open Source Branches 9.12 through 9.16 9.12.0 through versions before 9.16.14

BIND9 = Supported Preview Branches 9.9-S through 9.11-S 9.9.3-S1 through versions before 9.11.30-S1

EPSS Score

6% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit exists.

  • Vulnerability published.

  • Vulnerability Reserved.

Collectors

NVD DatabaseMitre Database

Credit

ISC would like to thank Siva Kakarla for bringing this vulnerability to our attention.
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