CVE-2021-25740 is a vulnerability in Kubernetes
Published on September 20, 2021
Holes in EndpointSlice Validation Enable Host Network Hijack
A security issue was discovered with Kubernetes that could enable users to send network traffic to locations they would otherwise not have access to via a confused deputy attack.
Vulnerability Analysis
CVE-2021-25740 is exploitable with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
What is a Confused Deputy Vulnerability?
The product receives a request, message, or directive from an upstream component, but the product does not sufficiently preserve the original source of the request before forwarding the request to an external actor that is outside of the product's control sphere. This causes the product to appear to be the source of the request, leading it to act as a proxy or other intermediary between the upstream component and the external actor.
CVE-2021-25740 has been classified to as a Confused Deputy vulnerability or weakness.
Products Associated with CVE-2021-25740
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Affected Versions
Kubernetes:- Version unspecified, <= 1.20.11 is affected.
- Version next of 1.20.11 and below unspecified is unknown.
- Version unspecified, <= 1.21.5 is affected.
- Version next of 1.21.5 and below unspecified is unknown.
- Version unspecified, <= 1.22.2 is affected.
- Version next of 1.22.2 and below unspecified is unknown.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.