CVE-2021-25218

Name: CVE-2021-25218
Creator: NVD / NIST
Published: 2021-08-18T19:15:07.333+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.56%

Last modified Jun 17, 2026

CVE-2021-25218 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 3.56% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

3.56%

87.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-617

Affected Software

Vendor	Product	Versions
Isc	Bind	9.16.19
Isc	Bind	9.17.16
Fedoraproject	Fedora	34

References

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

Timeline

Published: Aug 18, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-25218?

How severe is CVE-2021-25218?

CVE-2021-25218 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.56% probability of exploitation in the next 30 days.

How do I fix CVE-2021-25218?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-25218?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST