PT-2021-3738 · Red Hat · Red Hat Openshift Container Platform

Cj Cullen + 1 · Published 2021-07-15 · Updated 2026-05-22 · CVE-2021-25740

Positive Technologies (AI Summary)

CVSS v2.0

3.5

Low

Base vector

AV:N/AC:M/Au:S/C:P/I:N/A:N

Name of the Vulnerable Software and Affected Versions Kubernetes (affected versions not specified)

Description A security issue exists in Kubernetes that could allow users to send network traffic to locations they would not normally have access to. This is due to a confused deputy attack. The issue involves permissions related to Endpoint and EndpointSlice resources, potentially enabling cross-Namespace forwarding. A confused deputy attack occurs when a program with certain privileges is tricked into performing actions on behalf of another program, potentially granting unauthorized access or causing unintended consequences.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Incorrect Authorization

Weakness Enumeration

CWE-863

CWE-441

CWE-610

Related Identifiers

BDU:2021-03991

CVE-2021-25740

GHSA-VW47-MR44-3JF9

OESA-2022-2139

Affected Products

Red Hat Openshift Container Platform

References · 25

• https://nvd.nist.gov/vuln/detail/CVE-2021-25740 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-25740 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-vw47-mr44-3jf9 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-25740 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-03991 · Security Note
• https://osv.dev/vulnerability/OESA-2022-2139 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-25740 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-25740 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-25740 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-25740 · Vendor Advisory
• https://github.com/kubernetes/kubernetes · Note
• https://github.com/kubernetes/kubernetes/issues/103675 · Note
• https://twitter.com/Cyb3rR3s34rch/status/2057664139355640263 · Twitter Post
• https://openwall.com/lists/oss-security/2021/07/14/1 · Note
• https://access.redhat.com/security/cve/cve-2021-25740 · Note