---
id: "CVE-2015-5477"
kind: "vulnerability"
aliases: ["CVE-2015-5477"]
title: "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\u2026"
severity: "high"
cvss: 7.8
epss: null
exploited: true
status: "resolved"
category: "infrastructure"
products: [{"name": "ISC BIND", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "BIND", "fixed": ["9.9.7-P2", "9.10.2-P3"], "affected": ">= 9.1.0, <= 9.8.x; >= 9.9.0, <= 9.9.7-P1; >= 9.10.0, <= 9.10.2-P2", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": ["12.1"], "affected": "< 12.1", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": ["13.2"], "affected": ">= 13.1, < 13.2", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 12.1", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 12.1r", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 12.1x44", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 12.1x45", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 12.1x46", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 12.1x47", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 12.3", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 12.3x48", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 12.3x50", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 13.2", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 13.2x51", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 14.1", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 14.1x50", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 14.1x51", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 14.1x53", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 14.2", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 15.1", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 15.1x49", "ecosystem": "vendor"}, {"name": "juniper junos", "fixed": [], "affected": "= 15.1x53", "ecosystem": "vendor"}, {"name": "fedoraproject fedora", "fixed": [], "affected": "= 21", "ecosystem": "vendor"}, {"name": "fedoraproject fedora", "fixed": [], "affected": "= 22", "ecosystem": "vendor"}, {"name": "redhat enterprise linux", "fixed": [], "affected": "= 5.0", "ecosystem": "vendor"}, {"name": "redhat enterprise linux", "fixed": [], "affected": "= 6.0", "ecosystem": "vendor"}, {"name": "redhat enterprise linux", "fixed": [], "affected": "= 7.0", "ecosystem": "vendor"}, {"name": "redhat enterprise linux aus", "fixed": [], "affected": "= 6.4", "ecosystem": "vendor"}, {"name": "redhat enterprise linux aus", "fixed": [], "affected": "= 6.5", "ecosystem": "vendor"}, {"name": "redhat enterprise linux aus", "fixed": [], "affected": "= 6.6", "ecosystem": "vendor"}, {"name": "debian linux", "fixed": [], "affected": "= 7.0", "ecosystem": "vendor"}, {"name": "debian linux", "fixed": [], "affected": "= 8.0", "ecosystem": "vendor"}, {"name": "oracle vm server", "fixed": [], "affected": "= 3.2", "ecosystem": "vendor"}, {"name": "oracle solaris", "fixed": [], "affected": "= 10", "ecosystem": "vendor"}, {"name": "oracle solaris", "fixed": [], "affected": "= 11.2", "ecosystem": "vendor"}, {"name": "hp hp-ux", "fixed": [], "affected": "= 11.11", "ecosystem": "vendor"}, {"name": "hp hp-ux", "fixed": [], "affected": "= 11.23", "ecosystem": "vendor"}, {"name": "hp hp-ux", "fixed": [], "affected": "= 11.31", "ecosystem": "vendor"}, {"name": "canonical ubuntu linux", "fixed": [], "affected": "= 12.04", "ecosystem": "vendor"}, {"name": "netapp clustered data ontap", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "apple os x server", "fixed": [], "affected": "= 4.1.5", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["bind", "dns", "exploited", "infrastructure", "self-hosted"]
not_affected_if: ["bind-not-installed", "managed-dns"]
published_at: "2015-07-29T14:59:05+00:00"
first_seen_at: "2026-10-23T19:11:50+00:00"
updated_at: "2026-10-23T23:44:52+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2015-5477", "first_seen_at": "2026-10-23T19:11:50+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-23T21:35:52+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2015-5477", "first_seen_at": "2026-10-23T23:44:52+00:00"}]
---

# 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…

A crafted TKEY query makes BIND's named exit on a REQUIRE assertion failure, a remote unauthenticated denial of service. Recursive and authoritative servers are both affected. ACLs and config do not help, because the bug is hit early in packet handling. ISC says a third party has published PoC exploit code, and CISA lists it as exploited.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:ISC BIND affected ? fixed ?
- vendor:BIND affected >= 9.1.0, <= 9.8.x; >= 9.9.0, <= 9.9.7-P1; >= 9.10.0, <= 9.10.2-P2 fixed 9.9.7-P2, 9.10.2-P3
- vendor:juniper junos affected < 12.1 fixed 12.1
- vendor:juniper junos affected >= 13.1, < 13.2 fixed 13.2
- vendor:juniper junos affected = 12.1 fixed ?
- vendor:juniper junos affected = 12.1r fixed ?
- vendor:juniper junos affected = 12.1x44 fixed ?
- vendor:juniper junos affected = 12.1x45 fixed ?
- vendor:juniper junos affected = 12.1x46 fixed ?
- vendor:juniper junos affected = 12.1x47 fixed ?
- vendor:juniper junos affected = 12.3 fixed ?
- vendor:juniper junos affected = 12.3x48 fixed ?
- vendor:juniper junos affected = 12.3x50 fixed ?
- vendor:juniper junos affected = 13.2 fixed ?
- vendor:juniper junos affected = 13.2x51 fixed ?
- vendor:juniper junos affected = 14.1 fixed ?
- vendor:juniper junos affected = 14.1x50 fixed ?
- vendor:juniper junos affected = 14.1x51 fixed ?
- vendor:juniper junos affected = 14.1x53 fixed ?
- vendor:juniper junos affected = 14.2 fixed ?
- vendor:juniper junos affected = 15.1 fixed ?
- vendor:juniper junos affected = 15.1x49 fixed ?
- vendor:juniper junos affected = 15.1x53 fixed ?
- vendor:fedoraproject fedora affected = 21 fixed ?
- vendor:fedoraproject fedora affected = 22 fixed ?
- vendor:redhat enterprise linux affected = 5.0 fixed ?
- vendor:redhat enterprise linux affected = 6.0 fixed ?
- vendor:redhat enterprise linux affected = 7.0 fixed ?
- vendor:redhat enterprise linux aus affected = 6.4 fixed ?
- vendor:redhat enterprise linux aus affected = 6.5 fixed ?
- vendor:redhat enterprise linux aus affected = 6.6 fixed ?
- vendor:debian linux affected = 7.0 fixed ?
- vendor:debian linux affected = 8.0 fixed ?
- vendor:oracle vm server affected = 3.2 fixed ?
- vendor:oracle solaris affected = 10 fixed ?
- vendor:oracle solaris affected = 11.2 fixed ?
- vendor:hp hp-ux affected = 11.11 fixed ?
- vendor:hp hp-ux affected = 11.23 fixed ?
- vendor:hp hp-ux affected = 11.31 fixed ?
- vendor:canonical ubuntu linux affected = 12.04 fixed ?
- vendor:netapp clustered data ontap affected ? fixed ?
- vendor:apple os x server affected = 4.1.5 fixed ?

## How to check

Run 'named -v' (or 'dig @server version.bind chaos txt' if exposed). Vulnerable: BIND 9.1.0 through 9.8.x, 9.9.0 through 9.9.7-P1, 9.10.0 through 9.10.2-P2. Any named reachable on UDP/TCP 53 is exposed.

## Fix

Upgrade to BIND 9.9.7-P2 or 9.10.2-P3 or later. Versions older than 9.9 are end of life, so move to a current supported release. ISC lists no workaround.

## Timeline

- 2026-10-23T19:11:50+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2015-5477
- 2026-10-23T21:35:52+00:00 analyst — Read ISC AA-01272 (primary). Affected/fixed versions, no workaround, PoC public per ISC. Did not search social; 2015 CVE, no PoC link found.
- 2026-10-23T23:44:52+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2015-5477

## Documents

- [advisory] ISC AA-01272: CVE-2015-5477 TKEY REQUIRE assertion failure https://kb.isc.org/docs/aa-01272

## From the sources

ISC BIND contains a data processing errors vulnerability that could allow remote attackers to cause a denial of service via TKEY queries.

CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_