Threadlinqs IntelligenceStart free

VulnerabilityCVE-2015-5477Published 2015-07-29

CVE-2015-5477

highCISA KEVPublic exploit8 PoC repos

As of 2026-10-09, CVE-2015-5477 is a HIGH-severity vulnerability, CVSS v3.1 7.5, EPSS 91.8% (99.8th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-10-08), with a US federal remediation deadline of 2026-10-11. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2015-5477, most recently “Chinese Government-linked Actors Enabled by Integrity Technology Group Combine Automated and Hands-on Hacking Tools to Steal Sensitive Data (CISA AA26-281A)”.

CVSS v3.1
7.5/10High
EPSS
91.8%Higher than 99.8% of scored CVEs
CISA KEV
ListedAdded · due 2026-10-11
Tracked threats
1Campaigns referencing it
Priority
9/10Threadlinqs triage score
Published
Updated 2026-10-09
CVSS v3.1 7.5 (HIGH) · EPSS 91.8% (higher than 99.8% of all scored CVEs) · Priority 9/10 · Published 2015-07-29

Last updated:

What is CVE-2015-5477?

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.

The record classifies CVE-2015-5477 under weakness class CWE-617. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on availability. The identifier was first published 4091 days ago.

Severity and exploitation probability

CVSS v3.1 base score
7.5 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (FIRST)
91.8% probability of exploitation in the next 30 days, higher than 99.8% of all scored CVEs
CISA KEV
Listed since 2026-10-08, federal remediation deadline 2026-10-11
Threadlinqs priority
9/10 — CISA KEV-listed, which Threadlinqs floors at 9
Published
2015-07-29, last modified 2026-10-09

Is CVE-2015-5477 being exploited?

CISA added CVE-2015-5477 to the Known Exploited Vulnerabilities catalog on 2026-10-08, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-10-11 under BOD 22-01. Weaponised exploit code for CVE-2015-5477 is publicly available. 8 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 48 in the Threadlinqs vulnerability feed.

Affected products and versions

No affected-product or package list has been recorded for CVE-2015-5477 in the tracked sources. The vendor advisory and the references below are the authoritative statement of what is affected.

How to fix CVE-2015-5477

Because CVE-2015-5477 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-10-11. No vendor patch reference has been recorded for CVE-2015-5477 in the tracked sources. Follow the references below for a fix, and treat any affected deployment as exposed until the vendor states otherwise.

Threat activity tracking CVE-2015-5477

1 tracked threat in the Threadlinqs corpus references CVE-2015-5477, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on .

Vendor advisory and patch

Vulnerability database entry

Other references

Showing 7 of 20 recorded references.