CoreDNS is a DNS server that chains plugins. Starting in version 1.2.0 and prior to version 1.12.4, the CoreDNS etcd plugin contains a TTL confusion vulnerability where lease IDs are incorrectly used as TTL values, enabling DNS cache pinning attacks. This effectively creates a DoS condition for DNS resolution of affected services. The `TTL()` function in `plugin/etcd/etcd.go` incorrectly casts etcd lease IDs (64-bit integers) to uint32 and uses them as TTL values. Large lease IDs become very large TTLs when cast to uint32. This enables cache pinning attacks. Version 1.12.4 contains a fix for the issue.
https://github.com/coredns/coredns/security/advisories/GHSA-93mf-426m-g6x9
https://github.com/coredns/coredns/commit/e1768a5d272e9da649dfb8588595e5c6e4e640bf
Published: 2025-09-09
Updated: 2026-10-19
Named Vulnerability: GO-2025-3942Named Vulnerability: GHSA-93mf-426m-g6x9
Base Score: 7.5
Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:P/A:C
Severity: High
Base Score: 7.1
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Severity: High
EPSS: 0.00506