Exploited vulnerability · CISA KEV

Is CVE-2015-5477 exploited? Yes: in CISA KEV since 8 Oct 2026

Gociux · ISC BIND · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2015-5477, ISC BIND Data Processing Errors Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 8 Oct 2026, 4089 days after it was published. It affects ISC BIND. If you run it, CISA's required action is: 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.

What it is

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

1. Check whether you run it. Look for BIND in your asset inventory, including appliances and cloud images. Stack check lists every exploited ISC CVE at once.
2. Apply the fix. 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.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 29 Jul 2015.
4. Get told next time. Email alerts when CISA adds a CVE for ISC.

References

• access.redhat.com/errata/RHSA-2015:1513.html
• supportportal.juniper.net/s/article/2016-01-Security-Bulletin-Junos-Vulnerability-in-
• nvd.nist.gov/vuln/detail/CVE-2015-5477

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in October 2026 · act-now radar.