Home/CVE/BIND 9.11.0 - 9.11.36 9.12.0 - 9.16.26 9.17.0 - 9.18.0 BIND Supported Preview Editions: 9.11.4-S1 - 9.11.36-S1 9.16.8-S1
CVE

CVE-2021-25220

BIND 9.11.0 - 9.11.36 9.12.0 - 9.16.26 9.17.0 - 9.18.0 BIND Supported Preview Editions: 9.11.4-S1 - 9.11.36-S1 9.16.8-S1

BIND 9.11.0 - 9.11.36 9.12.0 - 9.16.26 9.17.0 - 9.18.0 BIND Supported Preview Editions: 9.11.4-S1 - 9.11.36-S1 9.16.8-S1 - 9.16.26-S1 Versions of BIND 9 earlier than those shown - back to 9.1.0, including Supported Preview Editions - are also believed to be affected but have not been tested as they are EOL. The cache could become poisoned with incorrect records leading to queries being made to the wrong servers, which might also result in false information being returned to clients.

MEDIUM · CVSS 6.8 EPSS 0.00088
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
▤

Affected Products & Versions

18
isc bind>= 9.11.0 and < 9.11.37
isc bind>= 9.11.4 and < 9.11.37
isc bind>= 9.12.0 and < 9.16.27
isc bind>= 9.16.8 and < 9.16.27
isc bind>= 9.17.0 and <= 9.18.0
fedoraproject fedoraall versions
netapp h300s firmwareall versions
netapp h500s firmwareall versions
▣

Scoring & Timeline

6.8
MEDIUM · CVSS v3.1 · security-officer@isc.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD23 Mar 2022 · 01:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N
⚑

Vendor Advisories

26
rhsaRHSA-2025:23414Important
rhsaRHSA-2025:22168Important
rhsaRHSA-2025:21741Important
rhsaRHSA-2025:21740Important
rhsaRHSA-2025:21889Important
🔗

References & Sources

10
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdfPatchThird Party Advisory
https://kb.isc.org/v1/docs/cve-2021-25220MitigationVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SXT7247QTKNBQ67MNRGZD23ADXU6E5U/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5VX3I2U3ICOIEI5Y7OYA6CHOLFMNH3YQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/API7U5E7SX7BAAVFNW366FFJGD6NZZKV/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DE3UAVCPUMAKG27ZL5YXSP2C3RIOW3JZ/
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