Is there a public exploit for CVE-2026-110021?

No public exploit for CVE-2026-110021 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-110021?

CVE-2026-110021 scores CVSS 6.9 (v4.0), rated medium.

What does CVE-2026-110021 affect?

CVE-2026-110021 affects PHOENIX CONTACT PLCnext Engineer.

6.9 Medium

PLCnext Engineer checks GSDX manifest reference digests but does not cryptographically verify the XML SignatureValue over canonicalized…

CVE-2026-110021

PLCnext Engineer checks GSDX manifest reference digests but does not cryptographically verify the XML SignatureValue over canonicalized SignedInfo. An unauthenticated local attacker can modify signed GSDML content, update its manifest digest, retain the public certificate data, and leave an invalid nonempty SignatureValue. PLCnext Engineer prior to 2026.6 reports the package as Valid and selects the modified device description for import under the default policy.

Assessment

CVSS: 6.9 (v4.0)
Severity: Medium
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 4 November 2026
Last updated: 4 November 2026
Affected: PHOENIX CONTACT · PLCnext Engineer
Assigner: CERTVDE

CVSS vectorCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

https://www.certvde.com/en/advisories/VDE-2026-121/

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