CVE-2021-25214

A broken inbound incremental zone update (IXFR) can cause named to terminate unexpectedly

At a glance

Severity: MEDIUM 6.5
EPSS: EPSS 6.28 % · percentile 94 (2026-10-27)
State: PUBLISHED
Published: 2021-04-29
Updated: 2024-09-17
Assigner: isc
NVD status: Modified

Description

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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	isc
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	NVD · security-officer@isc.org (Secondary)
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	NVD · nvd@nist.gov (Primary)
CVSS 2.0	MEDIUM 4.0	AV:N/AC:L/Au:S/C:N/I:N/A:P	NVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

CWE-617

European references

ENISA EUVD · EUVD-2021-12125
GCVE · GCVE-0-2021-25214

CERT-FR advisories

CERTFR-2025-AVI-0756 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
CERTFR-2022-AVI-216 — Multiples vulnérabilités dans les produits Siemens · cert.ssi.gouv.fr
CERTFR-2021-AVI-791 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
CERTFR-2021-AVI-325 — Multiples vulnérabilités dans BIND · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* ≥ 9.8.5 ≤ 9.8.8
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* ≥ 9.9.3 < 9.11.31
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* ≥ 9.12.0 < 9.16.15
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* ≥ 9.17.0 < 9.17.12
cpe:2.3:a:isc:bind:9.9.3:s1:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.9.12:s1:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.9.13:s1:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.10.5:s1:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.10.7:s1:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.11.3:s1:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.11.5:s3:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.11.5:s5:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.11.5:s6:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.11.6:s1:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.11.7:s1:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.11.8:s1:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.11.12:s1:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.11.21:s1:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.11.27:s1:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.11.29:s1:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.16.8:s1:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.16.11:s1:*:*:supported_preview:*:*:*
cpe:2.3:a:isc:bind:9.16.13:s1:*:*:supported_preview:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:* < 1.0.1.1
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vsphere:*:*
cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
cpe:2.3:o:netapp:aff_a250_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:netapp:aff_500f_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:netapp:h300e_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:netapp:h500e_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:netapp:h700e_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*

Affected products

Product	Versions
ISC · BIND9	affected Open Source Branch 9.8 9.8.5 through 9.8.8 ; affected Open Source Branches 9.9 through 9.11 9.9.3 through versions before 9.11.30 ; affected Open Source Branches 9.12 through 9.16 9.12.0 through versions before 9.16.14 ; affected Supported Preview Branches 9.9-S through 9.11-S 9.9.3-S1 through versions before 9.11.30-S1 ; affected Supported Preview Branch 9.16-S 9.16.8-S1 through versions before 9.16.14-S1 ; affected Development Branch 9.17 9.17.0 through versiosn before 9.17.12

Product

Versions

ISC · BIND9

affected Open Source Branch 9.8 9.8.5 through 9.8.8 ; affected Open Source Branches 9.9 through 9.11 9.9.3 through versions before 9.11.30 ; affected Open Source Branches 9.12 through 9.16 9.12.0 through versions before 9.16.14 ; affected Supported Preview Branches 9.9-S through 9.11-S 9.9.3-S1 through versions before 9.11.30-S1 ; affected Supported Preview Branch 9.16-S 9.16.8-S1 through versions before 9.16.14-S1 ; affected Development Branch 9.17 9.17.0 through versiosn before 9.17.12

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD