CVE-2021-25737

NameCVE-2021-25737
DescriptionA security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium
Debian Bugs990793

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
kubernetes (PTS)bullseye1.20.5+really1.20.2-1fixed
bookworm, sid1.20.5+really1.20.2-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
kubernetessourcebullseye(not affected)
kubernetessource(unstable)(unfixed)990793

Notes

[bullseye] - kubernetes <not-affected> (Kubernetes in Bullseye only ships the client)
https://www.openwall.com/lists/oss-security/2021/05/18/4
Server components no longer built since 1.20.5+really1.20.2-1

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