CVE-2020-27836

Name: CVE-2020-27836
Creator: NVD / NIST
Published: 2022-08-22T15:15:12.8+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.00%

Last modified Jun 17, 2026

CVE-2020-27836 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A flaw was found in cluster-ingress-operator. A change to how the router-default service allows only certain IP source ranges could allow an attacker to access resources that would otherwise be restricted to specified IP ranges. EPSS estimates a 1.00% chance of exploitation in the next 30 days.

Description

A flaw was found in cluster-ingress-operator. A change to how the router-default service allows only certain IP source ranges could allow an attacker to access resources that would otherwise be restricted to specified IP ranges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability..

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.00%

58.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Redhat	Openshift Container Platform	4.6

References

https://access.redhat.com/security/cve/CVE-2020-27836Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1905490Issue Tracking, Permissions Required, Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1906267Issue Tracking, Patch, Vendor Advisory
https://github.com/openshift/cluster-ingress-operator/pull/507/commits/92c83f281ba5fb6a1d91ecc3beaa4bcf2647a729Patch, Third Party Advisory
https://access.redhat.com/security/cve/CVE-2020-27836Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1905490Issue Tracking, Permissions Required, Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1906267Issue Tracking, Patch, Vendor Advisory
https://github.com/openshift/cluster-ingress-operator/pull/507/commits/92c83f281ba5fb6a1d91ecc3beaa4bcf2647a729Patch, Third Party Advisory

Timeline

Published: Aug 22, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-27836?

How severe is CVE-2020-27836?

CVE-2020-27836 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.00% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27836?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-27836?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST