ISC BIND Crashes on Malformed TKEY Queries, Exposing DNS Infrastructure to Unauthenticated Remote Denial of Service; CISA KEV Program Sets an October 11th Deadline for Covered Entities

Last refreshed2026-10-09

Status: KEV | Advisory ID: CVE-2015-5477

Key Details

CVE	CVE-2015-5477
Vulnerability Name	ISC BIND Data Processing Errors Vulnerability
CVSS Score / Version	7.5 (High) / CVSS v3.1
Updated	2026-10-09
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is none; integrity impact is none; availability impact is high.
Affected products	ISC BIND
Exploitation status	Listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating confirmed active exploitation.
Classified as	CWE-617 (Reachable Assertion)
KEV listing	Added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-10-08.
Exploitation prediction (EPSS)	91.81% probability of exploitation in the next 30 days (100% percentile) -- FIRST.org's EPSS model.
Federal remediation deadline	2026-10-11 (CISA KEV, Binding Operational Directive).

Affected Products, Subsystems & Sectors

Vendor	Product	Affected Versions	Patch Status
ISC	BIND

Vendor

Product

Affected Versions

Patch Status

ISC

BIND

Subsystems	General OT
Sectors	Multiple

What to Know

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

What to Do

Monitor ISC's web page for any future patch releases.

References

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2015-5477
CVE	https://www.cve.org/CVERecord?id=CVE-2015-5477

Source

Reference

NVD

https://nvd.nist.gov/vuln/detail/CVE-2015-5477

CVE

https://www.cve.org/CVERecord?id=CVE-2015-5477

KEV Required Action

Field	Value
KEV Link	https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Date Added to KEV	2026-10-08
Required Action Due Date	2026-10-11
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.

Field

Value

KEV Link

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Date Added to KEV

2026-10-08

Required Action Due Date

2026-10-11

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.