CVE-2026-9636Network attack vector

CIP Security bypass via revoked intermediate CA

Published Jul 14, 2026 · Updated Jul 14, 2026

Certificate revocation failure in Logix 5380/5580 36 through 37 and 1756-EN4TR 6.001 and 7.001 allows remote attackers to bypass CIP Security. The CIP Security validation path accepts an end-entity certificate after its issuing intermediate certificate is listed on the enabled CRL, instead of rejecting the chain. Reachability requires CRL enforcement and intermediate certificates; acceptance permits an untrusted network connection and exposes controller data.

CVSS severity8.2
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Certificate revocation failure in Logix 5380/5580 36 through 37 and 1756-EN4TR 6.001 and 7.001 allows remote attackers to bypass CIP Security. The CIP Security validation path accepts an end-entity certificate after its issuing intermediate certificate is listed on the enabled CRL, instead of rejecting the chain. Reachability requires CRL enforcement and intermediate certificates; acceptance permits an untrusted network connection and exposes controller data.

The record

CVE
CVE-2026-9636
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-299, T0886
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.2Rockwell AutomationCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
5.9Rockwell AutomationCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-299Improper Check for Certificate Revocation
T0886Remote Services

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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