Vulnerability in Isc Bind
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 -> 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.
Vulnerability class: HTTP Request Smuggling
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.034 (88.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.034 · newest: 0.034 · change: 0.000
Affected products
- Isc Bind — versions Open Source Branch 9.11 9.11.0 through versions before 9.11.37, Development Branch 9.17 BIND 9.17 all version, Open Source Branch 9.12-16 9.12.0 through versions before 9.16.27
- Juniper Junos — versions 19.3, 19.4, 20.2
- Juniper Srx100
- Juniper Srx110
- Juniper Srx1400
- Juniper Srx1500
- Juniper Srx210
- Juniper Srx220
- Juniper Srx240
- Juniper Srx240h2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- kb.isc.org/v1/docs/cve-2021-25220 (Mitigation, Vendor Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.netapp.com/advisory/ntap-20220408-0001/ (Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf (Patch, Third Party Advisory)
- security.gentoo.org/glsa/202210-25 (vendor-advisory, Third Party Advisory)
- supportportal.juniper.net/s/article/2022-10-Security-Bulletin-Junos-OS-SRX-Seri…
Frequently asked questions
- What is CVE-2021-25220?
- CVE-2021-25220 is a medium-severity vulnerability in Isc Bind, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 6.8/10. Published 2022-03-23.
- How severe is CVE-2021-25220?
- Medium severity. CVSS v3 base score is 6.8 out of 10.
- Is CVE-2021-25220 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.