CVE-2021-25214

high-risk

Published 2021-04-29

In BIND 9.8.5 -> 9.8.8, 9.9.3 -> 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 9 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 malformed IXFR triggering the flaw described above, the named process will terminate due to a failed assertion the next time the transferred secondary zone is refreshed.

Do I need to act?

0.75% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 6.5/10 Medium

NETWORK / LOW complexity

Affected Products (20)

Bind

Affected Vendors

Debian Isc Siemens Fedoraproject Netapp

References (22)

Mailing List http://www.openwall.com/lists/oss-security/2021/04/29/1

Mailing List http://www.openwall.com/lists/oss-security/2021/04/29/2

Mailing List http://www.openwall.com/lists/oss-security/2021/04/29/3

Mailing List http://www.openwall.com/lists/oss-security/2021/04/29/4

Patch https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf

Vendor Advisory https://kb.isc.org/v1/docs/cve-2021-25214

Mailing List https://lists.debian.org/debian-lts-announce/2021/05/msg00001.html

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...

Third Party Advisory https://security.netapp.com/advisory/ntap-20210521-0006/

Third Party Advisory https://www.debian.org/security/2021/dsa-4909

Mailing List http://www.openwall.com/lists/oss-security/2021/04/29/1

Mailing List http://www.openwall.com/lists/oss-security/2021/04/29/2

Mailing List http://www.openwall.com/lists/oss-security/2021/04/29/3

Mailing List http://www.openwall.com/lists/oss-security/2021/04/29/4

Patch https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf

Vendor Advisory https://kb.isc.org/v1/docs/cve-2021-25214

Mailing List https://lists.debian.org/debian-lts-announce/2021/05/msg00001.html

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...

and 2 more references

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high-risk

Severity 24/34 · High

Exploitability 3/34 · Minimal

Exposure 23/34 · High