GHSA-3fcv-jvfp-m4q9
CRITICALCilium vulnerable to sensitive information disclosure and cluster disruption via local Envoy admin socket access
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
github.com/cilium/cilium🐹github.com/cilium/cilium🐹github.com/cilium/ciliumReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Impact
When Cilium L7 functionality is enabled on a cluster, the Envoy instance supporting this functionality creates a world-accessible socket on cluster nodes. A local attacker would be able to access Envoy admin endpoints. Depending on deployment configuration, this can expose sensitive information or allow disruptive administrative operations, such as:
- Exposing TLS secrets
- Disrupting traffic in the cluster
- Terminating the Envoy process
This issue affects both the embedded and standalone Envoy deployment models.
Patches
This issue affects:
- Cilium v1.19 between v1.19.0 and v1.19.1 inclusive
- Cilium v1.18 between v1.18.0 and v1.18.7 inclusive
- All versions of Cilium prior to v1.17.14
This issue has been patched in https://github.com/cilium/cilium/pull/44512, included in:
- Cilium v1.19.2
- Cilium v1.18.8
- Cilium v1.17.14
Workarounds
There is no known workaround to this issue.
Acknowledgements
The Cilium community has worked together with members of Isovalent to prepare these mitigations. Special thanks to moemen for reporting the issue and 0xch4z for their work on triaging and remediating this issue.
For more information
If there are any questions or comments about this advisory, please reach out on [Slack (https://docs.cilium.io/en/latest/community/community/).
If anyone thinks they have found a vulnerability affecting Cilium, it is strongly encouraged to report it to the security mailing list at [email protected]. This is a private mailing list for the Cilium security team, and the report will be treated as a top priority.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/cilium/cilium | ≥ 1.19.0&&< 1.19.2 | 1.19.2 |
| 🐹Go | github.com/cilium/cilium | ≥ 1.18.0&&< 1.18.8 | 1.18.8 |
| 🐹Go | github.com/cilium/cilium | all versions | 1.17.14 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/cilium/cilium. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update github.com/cilium/cilium to 1.19.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-3fcv-jvfp-m4q9 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-3fcv-jvfp-m4q9 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-3fcv-jvfp-m4q9. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-3fcv-jvfp-m4q9 in your dependencies?
O3 detects GHSA-3fcv-jvfp-m4q9 across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.