CVE-2020-27836Network attack vector

Unauthorized resource access via overwritten source ranges

Published Aug 22, 2022 · Updated Aug 4, 2024

Authorization bypass in Red Hat OpenShift Ingress Operator 4.6 allows remote attackers to access IP-restricted resources. The reconciliation loop overwrites user-set loadBalancerSourceRanges on the router-default Service with a default that admits all IP ranges. Exposure requires a LoadBalancer Service whose source restrictions were configured directly in that field; clients outside the intended ranges can then reach routed resources.

CVSS severity7.5
High
EPSS probability1.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Red Hat OpenShift Ingress Operator 4.6 allows remote attackers to access IP-restricted resources. The reconciliation loop overwrites user-set loadBalancerSourceRanges on the router-default Service with a default that admits all IP ranges. Exposure requires a LoadBalancer Service whose source restrictions were configured directly in that field; clients outside the intended ranges can then reach routed resources.

The record

CVE
CVE-2020-27836
Published
Aug 22, 2022
Updated
Aug 4, 2024
Vendor
Red Hat
Product
OpenShift Ingress Operator
Classifications
CWE-732, T1190
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Fixed in ose-cluster-ingress-operator-container-v4.6.0-202012161211.p0.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Red Hat · OpenShift Ingress Operatorversion=Fixed in ose-cluster-ingress-operator-container-v4.6.0-202012161211.p0.

Published CVSS scores

7.5Red HatCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-732Incorrect Permission Assignment for Critical Resource
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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