CVE-2026-9636

mediumpriority · track · 0EPSS 0.002 · 12 %ileDEEURUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.22% (12th) EPSS
CVSS 5.9 · medium
Is it mine?
20 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-24

A security issue exists within CompactLogix® 5380, ControlLogix® 5580, and EN4 communication modules related to CIP Security certificate revocation handling. The security issue stems from the controller failing to properly reject certificates signed by an intermediate certificate that has been revoked via a Certificate Revocation List (CRL). This could allow a network-based attacker to establish a connection using a certificate that should be untrusted, potentially bypassing CIP Security protections.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • Fixed1756-EN4TRcisa_csaf_ot

    1756-EN4TR: Update to V8.001

  • FixedCompact GuardLogix 5380cisa_csaf_ot

    Compact GuardLogix 5380: Update to V38.011

  • FixedCompactLogix 5380cisa_csaf_ot

    CompactLogix 5380: Update to V38.011

  • FixedControlLogix 5580cisa_csaf_ot

    Rockwell Automation recommend users update to the following versions: ControlLogix 5580: Update to V38.011

  • FixedGuardLogix 5580cisa_csaf_ot

    GuardLogix 5580: Update to V38.011

02

cvss

Technical severity, 0–10. One row per scoring source.

8.2
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.6–8.2

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · CISA US
v3.15.9mediumAV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU
v4.08.2highCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:Nsecondary · ENISA EU
v4.08.2highCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · PSIRT@rockwellautomation.com
v4.04.6mediumCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-299USCWE-299USCWE-299US
05

affected products (20)

Products and version ranges known to be affected.

06

advisories (2)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2026-2338Rockwell Automation CompactLogix und ControlLogix: Mehrere SchwachstellenDeutsch2026-07-14csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in Rockwell Automation CompactLogix und Rockwell Automation ControlLogix ausnutzen, um einen Denial of Service Angriff durchzuführen oder vertrauliche Informationen offenzulegen.

  • ICSA-26-211-05Rockwell Automation CompactLogix 5380 ControlLogix 5580 / 1756-EN4TR Communications Module2026-07-30icsa · cisa_csaf_otUS

    Successful exploitation of this vulnerability could allow an attacker to cause a denial-of-service condition.

07

also known as (4)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducert_bundcisa_csaf_otNVDCVE.orgMITRE
published 2026-07-14modified 2026-10-24
09

references (3)

External citations — patches, advisories, analysis.

scry

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