CVE-2023-27594

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.

How to fix CVE-2023-27594

To remediate CVE-2023-27594, upgrade the affected package to a fixed version below.

—upgrade to 1.11.15 or later
—upgrade to 1.11.15 or later
—upgrade to 1.11.15 or later
—upgrade to 1.11.15 or later
—upgrade to 1.11.15 or later
—upgrade to 1.11.15 or later
—upgrade to 1.11.15 or later
—upgrade to 1.11.15 or later
—upgrade to 1.11.15 or later

Is CVE-2023-27594 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (9)

from 0, < 1.11.15, >= 1.12.0, < 1.12.8, >= 1.13.0, < 1.13.1
from 0, < 1.11.15, >= 1.12.0, < 1.12.8, >= 1.13.0, < 1.13.1
from 0, < 1.11.15, >= 1.12.0, < 1.12.8, >= 1.13.0, < 1.13.1
from 0, < 1.11.15, >= 1.12.0, < 1.12.8, >= 1.13.0, < 1.13.1
from 0, < 1.11.15, >= 1.12.0, < 1.12.8, >= 1.13.0, < 1.13.1
from 0, < 1.11.15, >= 1.12.0, < 1.12.8, >= 1.13.0, < 1.13.1
from 0, < 1.11.15, >= 1.12.0, < 1.12.8, >= 1.13.0, < 1.13.1
from 0, < 1.11.15, >= 1.12.0, < 1.12.8, >= 1.13.0, < 1.13.1
from 0, < 1.11.15

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	MEDIUM4.2	CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N