High severity · published May 26, 2026
CVE-2026-8047
Out-of-bounds Write in CODESYS Control
7.5
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CC
CODESYS Control RTE (SL) · CODESYS
3.5.21.0 before 3.5.22.20 · source: vendor
CC
CODESYS Control RTE (for Beckhoff CX) SL · CODESYS
3.5.21.0 before 3.5.22.20 · source: vendor
CC
CODESYS Control Win (SL) · CODESYS
3.5.21.0 before 3.5.22.20 · source: vendor
CC
CODESYS Control for BeagleBone SL · CODESYS
4.15.0.0 before 4.21.0.0 · source: vendor
CC
CODESYS Control for IOT2000 SL · CODESYS
4.15.0.0 before 4.21.0.0 · source: vendor
CC
CODESYS Control for Linux ARM SL · CODESYS
4.15.0.0 before 4.21.0.0 · source: vendor
CC
CODESYS Control for Linux SL · CODESYS
4.15.0.0 before 4.21.0.0 · source: vendor
CC
CODESYS Control for PFC100 SL · CODESYS
4.15.0.0 before 4.21.0.0 · source: vendor
CC
CODESYS Control for PFC200 SL · CODESYS
4.15.0.0 before 4.21.0.0 · source: vendor
CC
CODESYS Control for PLCnext SL · CODESYS
4.15.0.0 before 4.21.0.0 · source: vendor
CC
CODESYS Control for Raspberry Pi SL · CODESYS
4.15.0.0 before 4.21.0.0 · source: vendor
CC
CODESYS Control for WAGO Touch Panels 600 SL · CODESYS
0.0.0 before 4.21.0.0 · source: vendor
Affected product
CC
CODESYS Control for BeagleBone SL
CODESYS
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CODESYS Control Audit Log Format String DoS