CVE-2025-58063
CoreDNS: DNS Cache Pinning via etcd Lease ID Confusion
- State
- Published
- Severity
- 7.1 High
- Published
- Sep 9, 2025
- Updated
- Sep 10, 2025
- Reserved
- Aug 22, 2025
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.1 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H | GitHub_M |
Weaknesses
- CWE-681 Incorrect Conversion between Numeric Types
Affected Products
| Product | Versions |
|---|---|
corednscoredns |
|
References
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