VDB

CVE-2021-25214

CVE-2021-25214 PUBLISHED CVSS 6.5 MEDIUM

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

Reported by isc · Published April 29, 2021

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.

Fixed versions

Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.

PackageEcosystemFixed in
bind-utilsAmazon Linux32:9.11.4-26.P2.amzn2.5.2
bind-export-libsAmazon Linux32:9.11.4-26.P2.amzn2.5.2
bind-pkcs11Amazon Linux32:9.11.4-26.P2.amzn2.5.2
bind-licenseAmazon Linux32:9.11.4-26.P2.amzn2.5.2
bind-pkcs11-libsAmazon Linux32:9.11.4-26.P2.amzn2.5.2
bindAlpine9.16.15-r0
bind-pkcs11-develAmazon Linux32:9.11.4-26.P2.amzn2.5.2
bind-sdbAmazon Linux32:9.11.4-26.P2.amzn2.5.2
bind-develAmazon Linux32:9.11.4-26.P2.amzn2.5.2
bind-pkcs11-utilsAmazon Linux32:9.11.4-26.P2.amzn2.5.2
bind-export-develAmazon Linux32:9.11.4-26.P2.amzn2.5.2
bindArch Linux9.16.15-1

8 more packages have a fixed version. See every fix in Lookup.

Risk scores

CVSS 3.1
6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

VendorProductVersions
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
amazon:2bind-utils0
amazon:2bind-export-libs0
amazon:2bind-pkcs110
amazon:2bind-license0
amazon:2bind-pkcs11-libs0
alpinebind0
amazon:2bind-pkcs11-devel0
amazon:2bind-sdb0
amazon:2bind-devel0
amazon:2bind-pkcs11-utils0
amazon:2bind-export-devel0
archbind0
amazon:2bind-lite-devel0
wolfibind*
amazon:2bind-sdb-chroot0
amazon:2bind0
ISCBIND99.17, 9.9, 9.12
amazon:2bind-libs0
amazon:2bind-chroot0

…and 2 more

Timeline

  • Apr 28, 2021 CVE Published
  • Apr 29, 2021 EPSS Score (30 in total, the first dated here)
  • Sep 8, 2025 CVE Updated
  • Mar 7, 2026 Distribution Patch (19 in total, the first dated here)
  • Mar 7, 2026 Security Advisory (24 in total, the first dated here)
  • Aug 9, 2026 Coalition ESS Score

Query this with the API

The same record, from the CLI:

vulnetix vdb vuln CVE-2021-25214
vulnetix vdb fixes CVE-2021-25214

Or with curl, using the org id and key from your account page:

curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
  "https://api.vdb.vulnetix.com/v2/vuln/CVE-2021-25214/fixes/registry"

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References

Look up in the Resolve Platform →
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