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TI-2023-12303 Aliases CVE-2023-27593GHSA-4hc4-pgfx-3mrx

cilium-agent container can access the host via `hostPath` mount

Priority LOW 24CWE-276Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Prior to versions 1.11.15, 1.12.8, and 1.13.1, an attacker with access to a Cilium agent pod can write to `/opt/cni/bin` due to a `hostPath` mount of that directory in the agent pod. By replacing the CNI binary with their own malicious binary and waiting for the creation of a new pod on the node, the attacker can gain access to the underlying node. The issue has been fixed and the fix is available on versions 1.11.15, 1.12.8, and 1.13.1. Some workarounds are available. Kubernetes RBAC should be used to deny users and service accounts `exec` access to Cilium agent pods. In cases where a user requires `exec` access to Cilium agent pods, but should not have access to the underlying node, no workaround is possible.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00217 12th percentileScored 2026-11-07
Fix Fixed cilium (cilium): 1.11.15, 1.12.8, 1.13.1github.com/cilium/cilium (Go): 1.11.15, 1.12.8, 1.13.1

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

VendorProductAffected versionsFixed inStatusSource
ciliumciliumbefore 1.11.15; 1.12.0 to before 1.12.8; 1.13.0 to before 1.13.11.11.15, 1.12.8, 1.13.1Patch availableCNA
—github.com/cilium/cilium (Go)before 1.11.151.11.15Patch availableGHSA-4hc4-pgfx-3mrx
—github.com/cilium/cilium (Go)1.12.0 to before 1.12.81.12.8Patch availableGHSA-4hc4-pgfx-3mrx
—github.com/cilium/cilium (Go)1.13.0 to before 1.13.11.13.1Patch availableGHSA-4hc4-pgfx-3mrx
  • cilium Vendorcilium Affected before 1.11.15; 1.12.0 to before 1.12.8; 1.13.0 to before 1.13.1 Fixed in 1.11.15, 1.12.8, 1.13.1 Patch available CNA
  • github.com/cilium/cilium (Go) Vendor— Affected before 1.11.15 Fixed in 1.11.15 Patch available GHSA-4hc4-pgfx-3mrx
  • github.com/cilium/cilium (Go) Vendor— Affected 1.12.0 to before 1.12.8 Fixed in 1.12.8 Patch available GHSA-4hc4-pgfx-3mrx
  • github.com/cilium/cilium (Go) Vendor— Affected 1.13.0 to before 1.13.1 Fixed in 1.13.1 Patch available GHSA-4hc4-pgfx-3mrx

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*before 1.11.15; 1.12.0 to before 1.12.8; 1.13.0 to before 1.13.1Vulnerablecilium
  • cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:* Versions before 1.11.15; 1.12.0 to before 1.12.8; 1.13.0 to before 1.13.1 Vulnerable ·cilium

Remediation

  • Fix · CNA cilium (cilium) Fixed in 1.11.15, 1.12.8, 1.13.1
  • Fix · GHSA-4hc4-pgfx-3mrx github.com/cilium/cilium (Go) Fixed in 1.11.15 Advisory →
  • Fix · GHSA-4hc4-pgfx-3mrx github.com/cilium/cilium (Go) Fixed in 1.12.8 Advisory →
  • Fix · GHSA-4hc4-pgfx-3mrx github.com/cilium/cilium (Go) Fixed in 1.13.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-27593
  2. 2026-10-03 Alias added: GHSA-4hc4-pgfx-3mrx

References

Advisory 7

Other 2

  • 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
See all 34 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences