Security readout for executives and security teams
This is a denial-of-service risk in ISC BIND. A malformed inbound incremental zone transfer can make named crash later when the affected secondary zone refreshes. The business impact is DNS availability loss for services depending on vulnerable BIND secondary authoritative servers. Exposure is most likely on BIND servers acting as secondary authoritative DNS servers and receiving inbound IXFR zone updates. Pure recursive-only deployments are not indicated by the source description as the primary affected path. Treat as a moderate availability issue. Patch exposed DNS infrastructure during the next urgent maintenance window, faster where DNS redundancy is weak or affected servers support critical public services. Mitigation focus: Upgrade BIND to a fixed branch version or vendor-packaged security update.; Prioritize secondary authoritative DNS servers that receive IXFR updates.; Apply relevant Debian, Fedora, NetApp, or Siemens guidance where applicable..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CVE-2021-25214 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
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CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.isc.org/v1/docs/cve-2021-25214CVE reference · x_refsource_CONFIRM
- DSA-4909CVE reference · vendor-advisory, x_refsource_DEBIAN
- [debian-lts-announce] 20210504 [SECURITY] [DLA 2647-1] bind9 security updateCVE reference · mailing-list, x_refsource_MLIST
- FEDORA-2021-ace61cbee1CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-47f23870ecCVE reference · vendor-advisory, x_refsource_FEDORA
- https://security.netapp.com/advisory/ntap-20210521-0006/CVE reference · x_refsource_CONFIRM
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.