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Fencer Vulns
high 7.5

CVE-2026-8047 json

Out-of-bounds Write in CODESYS Control

published 2026-05-26 5 mo ago modified 2026-07-23 3 mo ago also EUVD-2026-31800

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits
0
none known

Summary

The affected products perform improper length checking when parsing incoming HTTP requests, resulting in a size-limited out-of-bounds write. An unauthenticated remote attacker can exploit this flaw to cause a denial of service via a system crash on the affected device.

Patch / fix

  • CODESYS CODESYS Control RTE (SL) 3.5.22.20
  • CODESYS CODESYS Control RTE (for Beckhoff CX) SL 3.5.22.20
  • CODESYS CODESYS Control Win (SL) 3.5.22.20
  • CODESYS CODESYS HMI (SL) 3.5.22.20
  • CODESYS CODESYS Runtime Toolkit 3.5.22.20
  • CODESYS CODESYS Control for BeagleBone SL 4.21.0.0
  • CODESYS CODESYS Control for emPC-A/iMX6 SL 4.21.0.0
  • CODESYS CODESYS Control for IOT2000 SL 4.21.0.0
  • CODESYS CODESYS Control for Linux ARM SL 4.21.0.0
  • CODESYS CODESYS Control for Linux SL 4.21.0.0
  • CODESYS CODESYS Control for PFC100 SL 4.21.0.0
  • CODESYS CODESYS Control for PFC200 SL 4.21.0.0
  • CODESYS CODESYS Control for PLCnext SL 4.21.0.0
  • CODESYS CODESYS Control for Raspberry Pi SL 4.21.0.0
  • CODESYS CODESYS Control for WAGO Touch Panels 600 SL 4.21.0.0
  • CODESYS CODESYS Virtual Control SL 4.21.0.0

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.45% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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

Affected products

  • CODESYS CODESYS Control RTE (SL)
  • CODESYS CODESYS Control RTE (for Beckhoff CX) SL
  • CODESYS CODESYS Control Win (SL)
  • CODESYS CODESYS HMI (SL)
  • CODESYS CODESYS Runtime Toolkit
  • CODESYS CODESYS Control for BeagleBone SL
  • CODESYS CODESYS Control for emPC-A/iMX6 SL
  • CODESYS CODESYS Control for IOT2000 SL
  • CODESYS CODESYS Control for Linux ARM SL
  • CODESYS CODESYS Control for Linux SL
  • CODESYS CODESYS Control for PFC100 SL
  • CODESYS CODESYS Control for PFC200 SL
  • CODESYS CODESYS Control for PLCnext SL
  • CODESYS CODESYS Control for Raspberry Pi SL
  • CODESYS CODESYS Control for WAGO Touch Panels 600 SL
  • CODESYS CODESYS Virtual Control SL

Classification

Weakness
  • CWE-1284 Improper Validation of Specified Quantity in Input

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.