CVE-2021-25214
No exploitation reported by the sources we read.
- Published2021-04-29
- Fixed in9.17.12 · 9.16.15 · 9.11.31
- WeaknessCWE-617
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2021-04-2901:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-25214?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-25214?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 9.17 | ≥ 9.17.0, < 9.17.12 | 9.17.12 | NVD |
| 9.x | ≥ 9.12.0, < 9.16.15 | 9.16.15 | NVD |
| 9.x | ≥ 9.9.3, < 9.11.31 | 9.11.31 | NVD |
| 9.8 | ≥ 9.8.5, ≤ 9.8.8 | no fix published | NVD |
| 9.9 | = 9.9.3 | no fix published | NVD |
| 9.9 | = 9.9.12 | no fix published | NVD |
| 9.9 | = 9.9.13 | no fix published | NVD |
| 9.10 | = 9.10.5 | no fix published | NVD |
| 9.10 | = 9.10.7 | no fix published | NVD |
| 9.11 | = 9.11.3 | no fix published | NVD |
| 9.11 | = 9.11.5 | no fix published | NVD |
| 9.11 | = 9.11.6 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 9.0 | = 9.0 | no fix published | NVD |
| 10.0 | = 10.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 33.x | = 33 | no fix published | NVD |
| 34.x | = 34 | no fix published | NVD |
12 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- bindAlmaLinux:8all versions · fixed in 32:9.11.26-6.el8and 14 other packages
Fix
- Update Isc bind to 9.17.12 · 9.16.15 · 9.11.31
Advisories and patches
- cert-portal.siemens.comPatch
- kb.isc.orgVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Published
- 2021-04-29
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-25214?
Is CVE-2021-25214 actively exploited?
What is the CVSS score for CVE-2021-25214?
Running bind? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.