Cyber Resilience

CVE-2026-9636

Published
14 July 2026
Modified
14 July 2026
CVSS Score v4 8.2
Click a component to see what it means
Raw vectorCVSS: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:X
EPSS Score 0.0014 4th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-9636 is a high-severity Improper Check for Certificate Revocation (CWE-299) vulnerability in Rockwellautomation (inferred from references). Its CVSS base score is 8.2 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A07:2025 Authentication Failures

EU & UK References

Vulnerability Data

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…

more

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.

CWE(s)
CWE-299

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
Why these techniques?

Network-based exploitation of certificate validation flaw in exposed industrial controllers enables unauthorized remote connections, directly mapping to public app and remote service exploitation techniques.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0

Likely ATT&CK TechniquesAI

Techniques this vulnerability likely enables, inferred from its description, weakness type, and attributed-actor tradecraft. Confidence is per-technique.

T1190 Exploit Public-Facing Application Initial Accessconfidence: HIGH
The certificate revocation bypass directly allows a network attacker to establish trusted CIP connections to the exposed controller.
attack.mitre.org →
inferred from description + CWE · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-4428Shared CWE-299
CVE-2026-56821Shared CWE-299
CVE-2025-36057Shared CWE-299
CVE-2025-3085Shared CWE-299
CVE-2025-11955Shared CWE-299
CVE-2024-56138Shared CWE-299
CVE-2026-6899Shared CWE-299
CVE-2023-23690Shared CWE-299

Affected Assets

Rockwellautomation
—
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V12.1.4

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.AA-03 mostly match
prevents

Certificate-based authentication requires valid, non-revoked certificates; proper revocation checking is a core implementation detail of this control.

PR.DS-02 mostly match
prevents

Protecting data-in-transit commonly relies on TLS certificate validation that includes revocation status checks.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.24 Use of cryptography mostly match
prevents

Mandates use of cryptography including certificate validation and revocation checking.

A.8.29 Security testing in development and acceptance mostly match
detects

Security testing can detect missing or incorrect certificate revocation checks.

A.8.28 Secure coding partial match
prevents

Secure coding practices should include proper certificate revocation verification.

A.8.5 Secure authentication partial match
prevents

Requires secure authentication mechanisms that rely on valid certificates.

A.8.20 Networks security none match
none

Network security controls can enforce certificate validation at network boundaries.

A.8.21 Security of network services none match
none

Security of network services includes certificate-based authentication and revocation checks.

References