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Fencer Vulns
medium 6.5

CVE-2021-45117 json

The OPC autogenerated ANSI C stack stubs (in the NodeSets) do not handle all error cases.

published 2022-03-21 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-31899

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

The OPC autogenerated ANSI C stack stubs (in the NodeSets) do not handle all error cases. This can lead to a NULL pointer dereference.

Patch / fix

  • opcfoundation ua-nodeset 1.05.01

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-22-132-08 updated cvss 6.5

Siemens Industrial Products with OPC UA

  • Siemens SIMATIC HMI Comfort Outdoor Panels (incl. SIPLUS variants) <V17_Update_5 Siemens SIMATIC HMI Comfort Panels (incl. SIPLUS variants) <V17_Update_5 Siemens SIMATIC HMI KTP Mobile Panels KTP400F, KTP700, KTP700F, KTP900 and KTP900F <V17_Update_5
    affected: fixed in V17, mitigation support.industry.siemens.com
  • Siemens SIMATIC NET PC Software V14 <V14_SP1_Update_14
    affected: fixed in V14, mitigation support.industry.siemens.com
  • Siemens SIMATIC NET PC Software V15
    affected: mitigation, no fix planned
  • Siemens SIMATIC NET PC Software V16 <V16_Update_6
    affected: fixed in V16, mitigation support.industry.siemens.com
  • Siemens SIMATIC NET PC Software V17 <V17_SP_1
    affected: fixed in V17, mitigation
  • Siemens SITOP Manager <V1.2.4
    affected: fixed in V1.2.4, mitigation support.industry.siemens.com
  • Siemens TeleControl Server Basic V3 <V3.1.1
    affected: fixed in V3.1.1, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

1.42% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • youtube.com https://www.youtube.com/watch?v=qv-RBdCaV4k referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.