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.
https://kb.isc.org/v1/docs/cve-2021-25214
http://www.openwall.com/lists/oss-security/2021/04/29/1
http://www.openwall.com/lists/oss-security/2021/04/29/2
http://www.openwall.com/lists/oss-security/2021/04/29/3
http://www.openwall.com/lists/oss-security/2021/04/29/4
https://www.debian.org/security/2021/dsa-4909
https://lists.debian.org/debian-lts-announce/2021/05/msg00001.html
https://security.netapp.com/advisory/ntap-20210521-0006/
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
Source: MITRE
Published: 2021-04-29
Updated: 2022-04-25
Type: CWE-617
Base Score: 4
Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 8
Severity: MEDIUM
Base Score: 6.5
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 2.8
Severity: MEDIUM