CVE-2015-5477: ISC BIND Data Processing Errors Vulnerability
Affects ISC BINDSource CISA KEV
No CVSS score published yet
- Exploitation
Actively exploited – in CISA KEV since 10/08/2026
- KEV deadline
- 10/11/2026
- EPSS
- 99.4% chance of exploitation in 30 days – higher than 99% of CVEs
What to do
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.
- web.archive.org/web/20150729014733/https://kb.isc.org/article/AA-01272 (opens in a new tab)
- access.redhat.com/errata/RHSA-2015:1513.html (opens in a new tab)
- supportportal.juniper.net/s/article/2016-01-Security-Bulletin-Junos-Vulnerability-in-ISC-BIND-named-CVE-2015-5477 (opens in a new tab)
- cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk (opens in a new tab)
- cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2015-5477 (opens in a new tab)
Description
CVE-2015-5477 is a vulnerability in ISC BIND that causes data processing errors when handling TKEY DNS resource record requests. This flaw can lead to a denial of service by causing the BIND DNS server (named) to exit unexpectedly due to an assertion failure triggered by specially crafted DNS queries. The vulnerability affects multiple Red Hat Enterprise Linux versions, and patches have been released to address the issue. Exploitation in the wild has been observed.
Weaknesses
References
- web.archive.org/web/20150729014733/https://kb.isc.org/article/AA-01272 (opens in a new tab)
- access.redhat.com/errata/RHSA-2015:1513.html (opens in a new tab)
- supportportal.juniper.net/s/article/2016-01-Security-Bulletin-Junos-Vulnerability-in-ISC-BIND-named-CVE-2015-5477 (opens in a new tab)
- cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk (opens in a new tab)
- cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2015-5477 (opens in a new tab)
- cisa.gov/known-exploited-vulnerabilities-catalog?search=CVE-2015-5477 (opens in a new tab)