A too-strict assertion check could be triggered when responses in BIND 9.16.19 and 9.17.16 require UDP fragmentation if RRL is in use
CVE-2021-25218

7.5HIGH

Key Information:

Vendor

Isc
Status
Bind9
Vendor
CVE Published:
18 August 2021

Badges

👾 Exploit Exists

What is CVE-2021-25218?

In BIND 9.16.19, 9.17.16. Also, version 9.16.19-S1 of BIND Supported Preview Edition When a vulnerable version of named receives a query under the circumstances described above, the named process will terminate due to a failed assertion check. The vulnerability affects only BIND 9 releases 9.16.19, 9.17.16, and release 9.16.19-S1 of the BIND Supported Preview Edition.

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Affected Version(s)

BIND9 Stable Branch 9.16.19

BIND9 Development Branch 9.17.16

BIND9 Supported Preview Edition 9.16.19-S1

References

https://kb.isc.org/v1/docs/cve-2021-25218
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http://www.openwall.com/lists/oss-security/2021/08/18/3
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http://www.openwall.com/lists/oss-security/2021/08/20/2
mailing-listx_refsource_MLIST

CVSS V3.1

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

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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