🛡️ CVE-2025-32793 — cilium

🟡 CVSS 5.0 — Medium ✅ No Known Exploit CWE-319 OSV
5.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

In Cilium, packets from terminating endpoints may not be encrypted in Wireguard-enabled clusters

Impact

When using [Wireguard transparent encryption](https://docs.cilium.io/en/stable/security/network/encryption-wireguard/#encryption-wg) 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.

Patches

This issue has been patched in https://github.com/cilium/cilium/pull/38592.

This issue affects:

  • Cilium v1.15 between v1.15.0 and v1.15.15 inclusive
  • Cilium v1.16 between v1.16.0 and v1.16.8 inclusive
  • Cilium v1.17 between v1.17.0 and v1.17.2 inclusive

This issue is fixed in:

  • Cilium v1.15.16
  • Cilium v1.16.9
  • Cilium v1.17.3

Workarounds

There is no workaround to this issue.

Acknowledgements

The Cilium community has worked together with members of Isovalent to prepare these mitigations. Special thanks to @gandro and @pippolo84 for reporting this issue and to @julianwiedmann for the patch.

For more information

If you think you have found a vulnerability affecting Cilium, we strongly encourage you to report it to our security mailing list at [[email protected]](mailto:[email protected]). This is a private mailing list for the Cilium security team, and your report will be treated as top priority.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality low, integrity none, availability none.

Weakness class

CVE-2025-32793 is classified as CWE-319: Cleartext Transmission of Sensitive Information. Sensitive data crosses the network without encryption and can be read or altered in transit.

Affected software

CVE-2025-32793 is recorded against 4 packages.

  • cilium
  • cilium-operator
  • github.com/cilium/cilium
  • hubble-relay

Timeline and source

Published on 23 April 2025 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from OSV.

References

github.com (Web)
github.com (Web)
nvd.nist.gov (Web)

Details

Severity MEDIUM
CVSS Score 5.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
CWE CWE-319
Public Exploit ✅ No
Source OSV
Published 2025-04-23
Updated 2026-08-12
Modified 2026-06-17

Affected Packages

Software From version Fixed in
cilium — —
cilium-operator — —
github.com/cilium/cilium — —
hubble-relay — —

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