{"cve":"CVE-2023-27593","nvd":{"published":"2023-03-17T20:15:13.430","modified":"2026-06-17T05:45:32.587","status":"Modified","description":"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.\n\nThe 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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-276"],"references":["https://github.com/cilium/cilium/pull/24075","https://github.com/cilium/cilium/releases/tag/v1.11.15","https://github.com/cilium/cilium/releases/tag/v1.12.8","https://github.com/cilium/cilium/releases/tag/v1.13.1","https://github.com/cilium/cilium/security/advisories/GHSA-4hc4-pgfx-3mrx"],"products":["cilium:cilium"],"source":"nvd","synced_at":"2026-10-19T21:37:48.383111019+00:00"},"epss":{"cve":"CVE-2023-27593","score":0.00217,"percentile":0.12166,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-4hc4-pgfx-3mrx","url":"https://osv.dev/vulnerability/GHSA-4hc4-pgfx-3mrx","summary":"cilium-agent container can access the host via `hostPath` mount","modified":"2026-09-10T03:49:52.397237390Z","packages":[{"ecosystem":"Go","name":"github.com/cilium/cilium","purl":"pkg:golang/github.com/cilium/cilium","ranges":["<1.11.15"],"fixed":["1.11.15"]},{"ecosystem":"Go","name":"github.com/cilium/cilium","purl":"pkg:golang/github.com/cilium/cilium","ranges":[">=1.12.0 <1.12.8"],"fixed":["1.12.8"]},{"ecosystem":"Go","name":"github.com/cilium/cilium","purl":"pkg:golang/github.com/cilium/cilium","ranges":[">=1.13.0 <1.13.1"],"fixed":["1.13.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}