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Vulnerability · Published Mar 17, 2023 · Assigned by GitHub_M

CVE-2023-27594Cilium vulnerable to potential network policy bypass when routing IPv6 traffic

Medium 4.2

In plain English

A medium-severity security flaw in cilium from cilium. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.2Medium
Exploit odds (30 days)0.6%top 53.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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, under specific conditions, Cilium may misattribute the source IP address of traffic to a cluster, identifying external traffic as coming from the host on which Cilium is running. As a consequence, network policies for that cluster might be bypassed, depending on the specific network policies enabled. This issue only manifests when Cilium is routing IPv6 traffic and NodePorts are used to route traffic to pods. IPv6 and endpoint routes are both disabled by default. The problem has been fixed and is available on versions 1.11.15, 1.12.8, and 1.13.1. As a workaround, disable IPv6 routing.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/cilium/cilium1.11.15GHSA-8fg8-jh2h-f2hc
Gogithub.com/cilium/cilium1.12.8GHSA-8fg8-jh2h-f2hc
Gogithub.com/cilium/cilium1.13.1GHSA-8fg8-jh2h-f2hc
Gogithub.com/cilium/cilium1.11.15, 1.12.8, 1.13.1GO-2023-1643

Affected products (as reported)

VendorProductVersions
cilium cilium < 1.11.15>= 1.12.0, < 1.12.8>= 1.13.0, < 1.13.1

Weakness: CWE-285 · Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

References