Denial of service via Kubernetes annotations in specific Cilium configurations
Key facts
- Attack vector
- Adjacent network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
Cilium is a networking, observability, and security solution with an eBPF-based dataplane. In Cilium clusters where Cilium's Layer 7 proxy has been disabled, creating workloads with `policy.cilium.io/proxy-visibility` annotations (in Cilium >= v1.13) or `io.cilium.proxy-visibility` annotations (in Cilium <= v1.12) causes the Cilium agent to segfault on the node to which the workload is assigned. Existing traffic on the affected node will continue to flow, but the Cilium agent on the node will not able to process changes to workloads running on the node. This will also prevent workloads from being able to start on the affected node. The denial of service will be limited to the node on which the workload is scheduled, however an attacker may be able to schedule workloads on the node of their choosing, which could lead to targeted attacks. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. Users unable to upgrade can avoid this denial of service attack by enabling the Layer 7 proxy.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| cilium | cilium | 1.14.0 to before 1.14.2; 1.13.0 to before 1.13.7; before 1.12.14 | 1.14.2, 1.13.7, 1.12.14 | Patch available | CNA |
| — | github.com/cilium/cilium (Go) | 1.14.0 to before 1.14.2 | 1.14.2 | Patch available | GHSA-24m5-r6hv-ccgp |
| — | github.com/cilium/cilium (Go) | before 1.12.14 | 1.12.14 | Patch available | GHSA-24m5-r6hv-ccgp |
| — | github.com/cilium/cilium (Go) | 1.13.0 to before 1.13.7 | 1.13.7 | Patch available | GHSA-24m5-r6hv-ccgp |
- cilium Vendorcilium Affected 1.14.0 to before 1.14.2; 1.13.0 to before 1.13.7; before 1.12.14 Fixed in 1.14.2, 1.13.7, 1.12.14 Patch available CNA
- github.com/cilium/cilium (Go) Vendor— Affected 1.14.0 to before 1.14.2 Fixed in 1.14.2 Patch available GHSA-24m5-r6hv-ccgp
- github.com/cilium/cilium (Go) Vendor— Affected before 1.12.14 Fixed in 1.12.14 Patch available GHSA-24m5-r6hv-ccgp
- github.com/cilium/cilium (Go) Vendor— Affected 1.13.0 to before 1.13.7 Fixed in 1.13.7 Patch available GHSA-24m5-r6hv-ccgp
Remediation
- Fix · CNA cilium (cilium) Fixed in 1.14.2, 1.13.7, 1.12.14
- Fix · GHSA-24m5-r6hv-ccgp github.com/cilium/cilium (Go) Fixed in 1.14.2 Advisory →
- Fix · GHSA-24m5-r6hv-ccgp github.com/cilium/cilium (Go) Fixed in 1.12.14 Advisory →
- Fix · GHSA-24m5-r6hv-ccgp github.com/cilium/cilium (Go) Fixed in 1.13.7 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2023-41332
- 2026-10-03 Alias added: GHSA-24m5-r6hv-ccgp
References
More Cilium vulnerabilities
- TI-2024-32092 CIDR deny policies may not take effect when a more narrow CIDR allow is present CVSS 3.1HIGH 8.7
- TI-2023-12305 Cilium eBPF filters may be temporarily removed during agent restart CVSS 3.1CRITICAL 9.8
- TI-2023-20486 Cilium NetworkPolicy bypass via pod labels CVSS 3.1CRITICAL 9.0
- TI-2022-11721 Incorrect Default Permissions in Cilium CVSS 3.1HIGH 8.8
- TI-2026-36600 Cilium: Sensitive information disclosure and cluster disruption via local Envoy admin socket access CVSS 3.1CRITICAL 9.2
- TI-2026-40915 Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces CVSS 3.1HIGH 8.9
Sources
- CVE-2023-41332 · CVE Program
- CVE-2023-41332 · NVD
- FIRST EPSS
- GHSA-24m5-r6hv-ccgp · GitHub Advisory Database · CC BY 4.0
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