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Fencer Vulns
critical 9.8

CVE-2020-27836 json

A flaw was found in cluster-ingress-operator.

published 2022-08-22 4 y ago modified 2026-06-17 4 mo ago also EUVD-2020-20335

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

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..

Patch / fix

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-27836 updated cvss 7.5

cluster-ingress-operator: changes to loadBalancerSourceRanges overwritten by operator

  • Red Hat OpenShift Container Platform 4.6 openshift4/ose-cluster-ingress-operator v4.6.0-202012161211.p0
    fixed: vendor fix RHSA-2020:5614
  • Red Hat OpenShift Container Platform 4.6 openshift4/ose-cli v4.6.0-202012160125.p0, openshift4/ose-pod v4.6.0-202012160125.p0, openshift4/ose-etcd v4.6.0-202012160125.p0, openshift4/ose-tests v4.6.0-202012161211.p0, openshift4/ose-console v4.6.0-202012161211.p0, openshift4/ose-coredns v4.6.0-202012161211.p0, +119 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.28% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • n/a cluster-ingress-operator

Classification

Weakness
  • CWE-732 Incorrect Permission Assignment for Critical Resource

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.