CVE-2024-28250: Cilium has possible unencrypted traffic between nodes when using WireGuard and L7 policies

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-18 · updated 2026-06-17
Weakness: CWE-311

Description

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Starting in version 1.14.0 and prior to versions 1.14.8 and 1.15.2, In Cilium clusters with WireGuard enabled and traffic matching Layer 7 policies Wireguard-eligible traffic that is sent between a node's Envoy proxy and pods on other nodes is sent unencrypted and Wireguard-eligible traffic that is sent between a node's DNS proxy and pods on other nodes is sent unencrypted. This issue has been resolved in Cilium 1.14.8 and 1.15.2 in in native routing mode (`routingMode=native`) and in Cilium 1.14.4 in tunneling mode (`routingMode=tunnel`). Not that in tunneling mode, `encryption.wireguard.encapsulate` must be set to `true`. There is no known workaround for this issue.

Affected products

cilium: from 1.14.0 before 1.14.8; from 1.15.0 before 1.15.2 — fixed in 1.14.8, 1.15.2

How to fix

Upgrade to a fixed version: cilium 1.14.8, 1.15.2. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2024-28250 or the next vulnerability affects your stack