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CVE-2021-3636

MEDIUM
4.6
CVSS Score
Published: July 30, 2021 at 07:27 PM UTC
Updated: June 17, 2026 at 04:05 AM UTC
1 product affected across 1 vendorOpenshift

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Severity
MEDIUM4.6
Exploit prediction
EPSS 0.3%

Description

It was found in OpenShift, before version 4.8, that the generated certificate for the in-cluster Service CA, incorrectly included additional certificates. The Service CA is automatically mounted into all pods, allowing them to safely connect to trusted in-cluster services that present certificates signed by the trusted Service CA. The incorrect inclusion of additional CAs in this certificate would allow an attacker that compromises any of the additional CAs to masquerade as a trusted in-cluster service.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Openshift· Red Hat
95%
v < 4.84.8
Affected range stops below 4.8, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_MISCExploitIssue TrackingPatchThird Party Advisory
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=1978621

CVSS

4.6MEDIUM[email protected]
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-295CWE-287

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