What’s Vulnerable › Vulnerabilities

CVE-2025-32793: Cilium packets from terminating endpoints may not be encrypted in Wireguard-enabled clusters

• Severity: medium (CVSS 4.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-21 · updated 2026-06-17
• Weakness: CWE-319

Description

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Versions 1.15.0 to 1.15.15, 1.16.0 to 1.16.8, and 1.17.0 to 1.17.2, are vulnerable when using Wireguard transparent encryption in a Cilium cluster, packets that originate from a terminating endpoint can leave the source node without encryption due to a race condition in how traffic is processed by Cilium. This issue has been patched in versions 1.15.16, 1.16.9, and 1.17.3. There are no workarounds available for this issue.

Affected products

• cilium: from 1.13.0 before 1.15.16; from 1.16.0 before 1.16.9; from 1.17.0 before 1.17.3 — fixed in 1.15.16, 1.16.9, 1.17.3

How to fix

Upgrade to a fixed version: cilium 1.15.16, 1.16.9, 1.17.3. Check the vendor advisory for mitigations.

References

• https://github.com/cilium/cilium/pull/38592
• https://github.com/cilium/cilium/security/advisories/GHSA-5vxx-c285-pcq4

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