{"cve":"CVE-2023-27595","nvd":{"published":"2023-03-17T22:15:11.317","modified":"2026-06-17T05:45:32.873","status":"Modified","description":"Cilium is a networking, observability, and security solution with an eBPF-based dataplane. In version 1.13.0, when Cilium is started, there is a short period when Cilium eBPF programs are not attached to the host. During this period, the host does not implement any of Cilium's featureset. This can cause disruption to newly established connections during this period due to the lack of Load Balancing, or can cause Network Policy bypass due to the lack of Network Policy enforcement during the window. This vulnerability impacts any Cilium-managed endpoints on the node (such as Kubernetes Pods), as well as the host network namespace (including Host Firewall). This vulnerability is fixed in Cilium 1.13.1 or later. Cilium releases 1.12.x, 1.11.x, and earlier are not affected. There are no known workarounds.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-755"],"references":["https://github.com/cilium/cilium/pull/24336","https://github.com/cilium/cilium/releases/tag/v1.13.1","https://github.com/cilium/cilium/security/advisories/GHSA-r5x6-w42p-jhpp","https://github.com/cilium/cilium/pull/24336","https://github.com/cilium/cilium/releases/tag/v1.13.1"],"products":["cilium:cilium"],"source":"nvd","synced_at":"2026-10-19T21:37:48.383111019+00:00"},"epss":{"cve":"CVE-2023-27595","score":0.00734,"percentile":0.54418,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-r5x6-w42p-jhpp","url":"https://osv.dev/vulnerability/GHSA-r5x6-w42p-jhpp","summary":"Cilium eBPF filters may be temporarily removed during agent restart","modified":"2026-09-10T03:49:56.904629113Z","packages":[{"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"]}]},{"id":"GO-2023-1644","url":"https://osv.dev/vulnerability/GO-2023-1644","summary":"Cilium eBPF filters may be temporarily removed during agent restart in github.com/cilium/cilium","modified":"2026-03-03T04:53:34.350436Z","packages":[{"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."]}