CVE-2021-25218high

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

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.5epss 3.6%

exploitation probability

3.6%top 11% of all CVEs

observed exploitation

nono source reports it

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

ISC · BIND9

References

https://kb.isc.org/v1/docs/cve-2021-25218 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZPJCLGSR4BTGFLBLGIE5TEQP2SNJKGVL/https://security.netapp.com/advisory/ntap-20210909-0002/http://www.openwall.com/lists/oss-security/2021/08/18/3 http://www.openwall.com/lists/oss-security/2021/08/20/2