CVE-2025-32793Network attack vector

Cleartext packet exposure via missing endpoint identity

Published Apr 21, 2025 · Updated Apr 21, 2025

Race condition in Cilium allows remote attackers to expose packets from terminating endpoints as cleartext in WireGuard-enabled clusters. The to-netdev WireGuard hook looks up the source IP in ipcache after endpoint teardown, obtains WORLD_ID, and skips tunnel redirection instead of using the identity stored in the packet mark. Reachability requires WireGuard transparent encryption and a packet racing with endpoint teardown; the resulting inter-node packet can leave its source node unencrypted.

CVSS severity4.0
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Race condition in Cilium allows remote attackers to expose packets from terminating endpoints as cleartext in WireGuard-enabled clusters. The to-netdev WireGuard hook looks up the source IP in ipcache after endpoint teardown, obtains WORLD_ID, and skips tunnel redirection instead of using the identity stored in the packet mark. Reachability requires WireGuard transparent encryption and a packet racing with endpoint teardown; the resulting inter-node packet can leave its source node unencrypted.

The record

CVE
CVE-2025-32793
Published
Apr 21, 2025
Updated
Apr 21, 2025
Vendor
Cilium
Product
Cilium
Classifications
T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= v1.13.0, < v1.15.16
  2. Affected versionversion=>= v1.16.0, < v1.16.9
  3. Affected versionversion=>= v1.17.0, < v1.17.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cilium · Ciliumversion=>= v1.13.0, < v1.15.16; version=>= v1.16.0, < v1.16.9; version=>= v1.17.0, < v1.17.3

Published CVSS scores

4.0GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo