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Actively exploited · Published Jul 29, 2015 · Assigned by mitre

CVE-2015-5477

High 7.5 Exploited

In plain English

A high-severity security flaw in BIND from ISC. Attackers are actively exploiting it in the wild (listed by CISA on October 8, 2026). The chance it is exploited in the next 30 days is estimated at 99.6% (higher than 99.9% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)99.6%top 0.1% of all CVEs
Exploited in the wildYesCISA KEV since Oct 8, 2026
Attack tooling2Metasploit, Public PoC

CISA guidance

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.

Federal agencies must remediate by Oct 11, 2026.

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12bind91:9.9.5.dfsg-11DEBIAN-CVE-2015-5477
Debian:13bind91:9.9.5.dfsg-11DEBIAN-CVE-2015-5477
Debian:14bind91:9.9.5.dfsg-11DEBIAN-CVE-2015-5477

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

Weakness: CWE-617 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References