Security readout for executives and security teams
This flaw can make a vulnerable BIND DNS server crash when it receives a specially formed query involving DNAME processing. The business impact is service availability: DNS resolution or authoritative DNS service may stop until the named process is restored and patched. Exposure is most likely on internet-facing or internally reachable BIND 9 authoritative or recursive DNS servers running affected 9.0-9.17 branch versions listed by ISC and downstream vendors. Treat as a high-priority availability risk for DNS infrastructure. It does not indicate data theft, but DNS outages can interrupt customer access, internal services, authentication flows, and incident response tooling. Mitigation focus: Upgrade BIND to a fixed release for the deployed branch, such as 9.11.30, 9.16.14, or 9.17.12.; Apply distribution security updates for bind9 from Debian, Fedora, Oracle, or the relevant platform vendor.; Check ISC and product-vendor advisories for embedded BIND exposure in appliances and managed DNS products..
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-2021-25215 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/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-2021-25215CVE 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://www.oracle.com/security-alerts/cpuoct2021.htmlCVE reference · x_refsource_MISC
- 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.