Vulnerability · Published Jan 22, 2025 · Assigned by GitHub_M
CVE-2025-23028DoS in Cilium agent DNS proxy from crafted DNS responses
Medium 5.3
In plain English
A medium-severity resource allocation without limits in cilium from cilium. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Cilium is a networking, observability, and security solution with an eBPF-based dataplane. A denial of service vulnerability affects versions 1.14.0 through 1.14.7, 1.15.0 through 1.15.11, and 1.16.0 through 1.16.4. In a Kubernetes cluster where Cilium is configured to proxy DNS traffic, an attacker can crash Cilium agents by sending a crafted DNS response to workloads from outside the cluster. For traffic that is allowed but without using DNS-based policy, the dataplane will continue to pass traffic as configured at the time of the DoS. For workloads that have DNS-based policy configured, existing connections may continue to operate, and new connections made without relying on DNS resolution may continue to be established, but new connections which rely on DNS resolution may be disrupted. Any configuration changes that affect the impacted agent may not be applied until the agent is able to restart. This issue is fixed in Cilium v1.14.18, v1.15.12, and v1.16.5. No known workarounds are available.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/cilium/cilium | 1.14.18 | GHSA-9m5p-c77c-f9j7 |
| Go | github.com/cilium/cilium | 1.15.12 | GHSA-9m5p-c77c-f9j7 |
| Go | github.com/cilium/cilium | 1.16.5 | GHSA-9m5p-c77c-f9j7 |
| Go | github.com/cilium/cilium | 1.14.18, 1.15.12, 1.16.5 | GO-2025-3415 |
Affected products (as reported)
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References
- https://github.com/cilium/cilium/security/advisories/GHSA-9m5p-c77c-f9j7 x_refsource_CONFIRM
- https://github.com/cilium/cilium/pull/36252 x_refsource_MISC