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TI-2021-07474 Aliases CVE-2021-25214GHSA-pqmv-mqwc-wmr3

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

Priority LOW 38CWE-617Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-617.

Summary

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.

Why it matters now

EPSS 0.06403 93rd percentileScored 2026-11-07
Fix Fixed Red Hat: 2 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
ISCBIND9Open Source Branch 9.8 9.8.5 through 9.8.8; Open Source Branches 9.9 through 9.11 9.9.3 through versions before 9.11.30; Open Source Branches 9.12 through 9.16 9.12.0 through versions before 9.16.14; Supported Preview Branches 9.9-S through 9.11-S 9.9.3-S1 through versions before 9.11.30-S1; Supported Preview Branch 9.16-S 9.16.8-S1 through versions before 9.16.14-S1; Development Branch 9.17 9.17.0 through versiosn before 9.17.12—No fix listedCNA
  • BIND9 VendorISC Affected Open Source Branch 9.8 9.8.5 through 9.8.8; Open Source Branches 9.9 through 9.11 9.9.3 through versions before 9.11.30; Open Source Branches 9.12 through 9.16 9.12.0 through versions before 9.16.14; Supported Preview Branches 9.9-S through 9.11-S 9.9.3-S1 through versions before 9.11.30-S1; Supported Preview Branch 9.16-S 9.16.8-S1 through versions before 9.16.14-S1; Development Branch 9.17 9.17.0 through versiosn before 9.17.12 Fixed in — No fix listed CNA

CPE configurations NVD · 45

CPEVersionsRoleVendor
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*9.8.5 – 9.8.8; 9.9.3 to before 9.11.31; 9.12.0 to before 9.16.15; 9.17.0 to before 9.17.12VulnerableISC
cpe:2.3:a:isc:bind:9.9.3:s1:*:*:supported_preview:*:*:*9.9.3 s1VulnerableISC
cpe:2.3:a:isc:bind:9.9.12:s1:*:*:supported_preview:*:*:*9.9.12 s1VulnerableISC
cpe:2.3:a:isc:bind:9.9.13:s1:*:*:supported_preview:*:*:*9.9.13 s1VulnerableISC
cpe:2.3:a:isc:bind:9.10.5:s1:*:*:supported_preview:*:*:*9.10.5 s1VulnerableISC
cpe:2.3:a:isc:bind:9.10.7:s1:*:*:supported_preview:*:*:*9.10.7 s1VulnerableISC
cpe:2.3:a:isc:bind:9.11.3:s1:*:*:supported_preview:*:*:*9.11.3 s1VulnerableISC
cpe:2.3:a:isc:bind:9.11.5:s3:*:*:supported_preview:*:*:*9.11.5 s3VulnerableISC
cpe:2.3:a:isc:bind:9.11.5:s5:*:*:supported_preview:*:*:*9.11.5 s5VulnerableISC
cpe:2.3:a:isc:bind:9.11.5:s6:*:*:supported_preview:*:*:*9.11.5 s6VulnerableISC
  • cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* Versions 9.8.5 – 9.8.8; 9.9.3 to before 9.11.31; 9.12.0 to before 9.16.15; 9.17.0 to before 9.17.12 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.9.3:s1:*:*:supported_preview:*:*:* Versions 9.9.3 s1 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.9.12:s1:*:*:supported_preview:*:*:* Versions 9.9.12 s1 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.9.13:s1:*:*:supported_preview:*:*:* Versions 9.9.13 s1 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.10.5:s1:*:*:supported_preview:*:*:* Versions 9.10.5 s1 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.10.7:s1:*:*:supported_preview:*:*:* Versions 9.10.7 s1 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.11.3:s1:*:*:supported_preview:*:*:* Versions 9.11.3 s1 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.11.5:s3:*:*:supported_preview:*:*:* Versions 9.11.5 s3 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.11.5:s5:*:*:supported_preview:*:*:* Versions 9.11.5 s5 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.11.5:s6:*:*:supported_preview:*:*:* Versions 9.11.5 s6 Vulnerable ·ISC
Show 35 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:isc:bind:9.11.6:s1:*:*:supported_preview:*:*:*9.11.6 s1VulnerableISC
cpe:2.3:a:isc:bind:9.11.7:s1:*:*:supported_preview:*:*:*9.11.7 s1VulnerableISC
cpe:2.3:a:isc:bind:9.11.8:s1:*:*:supported_preview:*:*:*9.11.8 s1VulnerableISC
cpe:2.3:a:isc:bind:9.11.12:s1:*:*:supported_preview:*:*:*9.11.12 s1VulnerableISC
cpe:2.3:a:isc:bind:9.11.21:s1:*:*:supported_preview:*:*:*9.11.21 s1VulnerableISC
cpe:2.3:a:isc:bind:9.11.27:s1:*:*:supported_preview:*:*:*9.11.27 s1VulnerableISC
cpe:2.3:a:isc:bind:9.11.29:s1:*:*:supported_preview:*:*:*9.11.29 s1VulnerableISC
cpe:2.3:a:isc:bind:9.16.8:s1:*:*:supported_preview:*:*:*9.16.8 s1VulnerableISC
cpe:2.3:a:isc:bind:9.16.11:s1:*:*:supported_preview:*:*:*9.16.11 s1VulnerableISC
cpe:2.3:a:isc:bind:9.16.13:s1:*:*:supported_preview:*:*:*9.16.13 s1VulnerableISC
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*33VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*34VulnerableFedoraproject
cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:*before 1.0.1.1VulnerableSiemens
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vsphere:*:*not specified by NVDVulnerableNetApp
cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:o:netapp:aff_a250_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:aff_a250:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:aff_500f_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:aff_500f:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:h300s:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:h500s:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:h700s:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:h300e_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:h300e:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:h500e_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:h500e:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:h700e_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:h700e:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:h:netapp:h410s:-:*:*:*:*:*:*:*not specified by NVDRunning onNetApp
  • cpe:2.3:a:isc:bind:9.11.6:s1:*:*:supported_preview:*:*:* Versions 9.11.6 s1 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.11.7:s1:*:*:supported_preview:*:*:* Versions 9.11.7 s1 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.11.8:s1:*:*:supported_preview:*:*:* Versions 9.11.8 s1 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.11.12:s1:*:*:supported_preview:*:*:* Versions 9.11.12 s1 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.11.21:s1:*:*:supported_preview:*:*:* Versions 9.11.21 s1 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.11.27:s1:*:*:supported_preview:*:*:* Versions 9.11.27 s1 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.11.29:s1:*:*:supported_preview:*:*:* Versions 9.11.29 s1 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.16.8:s1:*:*:supported_preview:*:*:* Versions 9.16.8 s1 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.16.11:s1:*:*:supported_preview:*:*:* Versions 9.16.11 s1 Vulnerable ·ISC
  • cpe:2.3:a:isc:bind:9.16.13:s1:*:*:supported_preview:*:*:* Versions 9.16.13 s1 Vulnerable ·ISC
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
  • cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:* Versions before 1.0.1.1 Vulnerable ·Siemens
  • cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vsphere:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:o:netapp:aff_a250_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:aff_a250:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:aff_500f_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:aff_500f:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:h300s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:h500s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:h700s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:h300e_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:h300e:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:h500e_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:h500e:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:h700e_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:h700e:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
  • cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:h:netapp:h410s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp

Remediation

Red Hat 2 advisories

  • RHSA-2021:4384 Released 2021-11-09 · Red Hat rating Moderate
    bind security and bug fix update
    • Red Hat Enterprise Linux AppStream (v. 8) bind-32:9.11.26-6.el8, bind-chroot-32:9.11.26-6.el8, bind-devel-32:9.11.26-6.el8 +12
    • Red Hat Enterprise Linux BaseOS (v. 8) bind-32:9.11.26-6.el8, bind-export-devel-32:9.11.26-6.el8, bind-export-libs-32:9.11.26-6.el8
  • RHSA-2021:3325 Released 2021-08-31 · Red Hat rating Moderate
    bind security update
    • Red Hat Enterprise Linux Client (v. 7) bind-32:9.11.4-26.P2.el7_9.7, bind-export-libs-32:9.11.4-26.P2.el7_9.7, bind-libs-32:9.11.4-26.P2.el7_9.7 +3
    • Red Hat Enterprise Linux Client Optional (v. 7) bind-32:9.11.4-26.P2.el7_9.7, bind-chroot-32:9.11.4-26.P2.el7_9.7, bind-devel-32:9.11.4-26.P2.el7_9.7 +8
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) bind-32:9.11.4-26.P2.el7_9.7, bind-chroot-32:9.11.4-26.P2.el7_9.7, bind-devel-32:9.11.4-26.P2.el7_9.7 +8
    • Red Hat Enterprise Linux Server (v. 7) bind-32:9.11.4-26.P2.el7_9.7, bind-chroot-32:9.11.4-26.P2.el7_9.7, bind-export-libs-32:9.11.4-26.P2.el7_9.7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7) bind-devel-32:9.11.4-26.P2.el7_9.7, bind-devel-32:9.11.4-26.P2.el7_9.7.ppc, bind-export-devel-32:9.11.4-26.P2.el7_9.7 +7
    • Red Hat Enterprise Linux Workstation (v. 7) bind-32:9.11.4-26.P2.el7_9.7, bind-chroot-32:9.11.4-26.P2.el7_9.7, bind-export-libs-32:9.11.4-26.P2.el7_9.7 +7
    • Red Hat Enterprise Linux Workstation Optional (v. 7) bind-devel-32:9.11.4-26.P2.el7_9.7, bind-export-devel-32:9.11.4-26.P2.el7_9.7, bind-lite-devel-32:9.11.4-26.P2.el7_9.7 +3

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    ISC BIND9 — DSA-4909

    3 records Highest priority Priority HIGH 1 HIGH, 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2021-07476 A second vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a buffer overflow attackPriority HIGH 83
    • TI-2021-07475 Reachable assertion in ISC BIND9Priority MEDIUM 46
    Show all 3 records → Advisory →
  • Advisory ·

    ISC BIND9 — FEDORA-2021-ace61cbee1

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    Show all 2 records → Advisory →
Show 1 more group
  • Advisory ·

    ISC BIND9 — FEDORA-2021-47f23870ec

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    Show all 2 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:4384
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2021:4384
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2021:3325
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2021:3325
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2021:3325
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2021:3325
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2021:3325
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2021:3325
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2021:3325
Not affected: 3 products
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-25214
  2. 2026-10-03 Alias added: GHSA-pqmv-mqwc-wmr3

References

Patch 1

Advisory 10

  • TI-2015-04610 Assertion failure in ISC BIND named via TKEY queries KEVCVSS 3.1HIGH 7.5
  • TI-2023-27571 Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related… CVSS 3.1HIGH 7.5
  • TI-2021-07476 A second vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a buffer overflow attack CVSS 3.1CRITICAL 9.8
  • TI-2023-27773 The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance… CVSS 3.1HIGH 7.5
  • TI-2020-06910 A logic error in code which checks TSIG validity can be used to trigger an assertion failure in tsig.c CVSS 3.1HIGH 7.5
  • TI-2016-02320 buffer.c in named in ISC BIND 9 before 9.9.9-P3, 9.10.x before 9.10.4-P3, and 9.11.x… CVSS 3.0HIGH 7.5
See all 192 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences