CVE-2026-8047: CWE-1284 Improper Validation of Specified Quantity in Input in CODESYS CODESYS Control RTE (SL)
CVE-2026-8047 is a high-severity vulnerability in CODESYS Control RTE (SL) version 3.5.21.0. It involves improper length checking when parsing incoming HTTP requests, leading to a size-limited out-of-bounds write. An unauthenticated remote attacker can exploit this flaw to cause a denial of service by crashing the affected device.
AI Analysis
Technical Summary
The vulnerability in CODESYS Control RTE (SL) version 3.5.21.0 arises from improper validation of the specified quantity in input during HTTP request parsing. This results in a size-limited out-of-bounds write condition. Because the flaw can be triggered remotely without authentication, it allows an attacker to cause a denial of service by crashing the system.
Potential Impact
An unauthenticated remote attacker can exploit this vulnerability to cause a denial of service via a system crash on devices running the affected version of CODESYS Control RTE (SL). There is no indication of code execution or data disclosure, but the service disruption impact is high.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Users should monitor vendor communications for updates and apply patches once available.
CVE-2026-8047: CWE-1284 Improper Validation of Specified Quantity in Input in CODESYS CODESYS Control RTE (SL)
Description
CVE-2026-8047 is a high-severity vulnerability in CODESYS Control RTE (SL) version 3.5.21.0. It involves improper length checking when parsing incoming HTTP requests, leading to a size-limited out-of-bounds write. An unauthenticated remote attacker can exploit this flaw to cause a denial of service by crashing the affected device.
CVSS v4.0
Score 8.7high
Affected software
pkg:github/codesys/CODESYS-Control-RTE-SLRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in CODESYS Control RTE (SL) version 3.5.21.0 arises from improper validation of the specified quantity in input during HTTP request parsing. This results in a size-limited out-of-bounds write condition. Because the flaw can be triggered remotely without authentication, it allows an attacker to cause a denial of service by crashing the system.
Potential Impact
An unauthenticated remote attacker can exploit this vulnerability to cause a denial of service via a system crash on devices running the affected version of CODESYS Control RTE (SL). There is no indication of code execution or data disclosure, but the service disruption impact is high.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Users should monitor vendor communications for updates and apply patches once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- CERTVDE
- Date Reserved
- 2026-05-06T17:12:05.142Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1551e2891d628fdccaabd2
Added to database: 05/26/2026, 07:55:14 UTC
Last enriched: 06/18/2026, 18:30:21 UTC
Last updated: 07/31/2026, 19:23:00 UTC
Views: 108
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