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Fencer Vulns
high 7.5

CVE-2021-30195 json

CODESYS V2 runtime system before 2.4.7.55 has Improper Input Validation.

published 2021-05-25 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-17127

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.6%
EPSS 7.6% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

CODESYS V2 runtime system before 2.4.7.55 has Improper Input Validation.

Patch / fix

  • codesys plcwinnt 2.4.7.55
  • codesys runtime_toolkit 2.4.7.55
  • wago 750-893_firmware fw08
  • wago 750-891_firmware fw08
  • wago 750-890_firmware fw08
  • wago 750-889_firmware fw15
  • wago 750-885_firmware fw15
  • wago 750-882_firmware fw15
  • wago 750-881_firmware fw15
  • wago 750-880_firmware fw16
  • wago 750-862_firmware fw08
  • wago 750-852_firmware fw15
  • wago 750-832_firmware fw08
  • wago 750-831_firmware fw15
  • wago 750-829_firmware fw15
  • wago 750-8202_firmware 03.06.19_\(18\)
  • wago 750-8203_firmware 03.06.19_\(18\)
  • wago 750-8204_firmware 03.06.19_\(18\)
  • wago 750-8206_firmware 03.06.19_\(18\)
  • wago 750-8207_firmware 03.06.19_\(18\)

Vendor advisories

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

cisa ICSA-26-076-01 updated cvss 7.5

CODESYS in Festo Automation Suite

  • CODESYS Development System 3.0 Festo Automation Suite 2.8.0.137, Festo Automation Suite < 2.8.0.138 CODESYS Development System 3.5.16.10 Festo Automation Suite 2.8.0.137, Festo Automation Suite < 2.8.0.138
    affected: mitigation
  • Festo Automation Suite 2.8.0.138 CODESYS Development System 3.5.21.20
    fixed

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

cisa ICSA-21-173-03 updated cvss 7.5

CODESYS Control V2 communication

  • CODESYS, GmbH CODESYS PLCWinNT < 2.4.7.55 CODESYS, GmbH CODESYS Runtime Toolkit 32-bit full < 2.4.7.55
    affected: vendor fix, mitigation “Please visit the CODESYS update area for more information on how to obtain the software updates.” codesys.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

7.55% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/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.