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. There are no known exploits in the wild and no official patch or remediation guidance has been provided yet.
AI Analysis
Technical Summary
This vulnerability arises from improper validation of specified quantity in input (CWE-1284) within CODESYS Control RTE (SL) 3.5.21.0. Specifically, the product does not correctly check the length of incoming HTTP request data, resulting in a size-limited out-of-bounds write condition. This can be triggered remotely without authentication, causing the device to crash and resulting in denial of service. The CVSS 4.0 base score is 8.7, reflecting high severity with network attack vector, no required privileges or user interaction, and high impact on availability.
Potential Impact
Successful exploitation results in denial of service via system crash of the affected device. There is no indication of data confidentiality or integrity impact. The vulnerability can be triggered remotely by an unauthenticated attacker, making it a significant availability risk for systems running the affected version.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider limiting exposure of affected devices to untrusted networks to reduce risk. Monitor vendor channels for updates and apply patches promptly 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. There are no known exploits in the wild and no official patch or remediation guidance has been provided yet.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability arises from improper validation of specified quantity in input (CWE-1284) within CODESYS Control RTE (SL) 3.5.21.0. Specifically, the product does not correctly check the length of incoming HTTP request data, resulting in a size-limited out-of-bounds write condition. This can be triggered remotely without authentication, causing the device to crash and resulting in denial of service. The CVSS 4.0 base score is 8.7, reflecting high severity with network attack vector, no required privileges or user interaction, and high impact on availability.
Potential Impact
Successful exploitation results in denial of service via system crash of the affected device. There is no indication of data confidentiality or integrity impact. The vulnerability can be triggered remotely by an unauthenticated attacker, making it a significant availability risk for systems running the affected version.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider limiting exposure of affected devices to untrusted networks to reduce risk. Monitor vendor channels for updates and apply patches promptly 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: 5/26/2026, 7:55:14 AM
Last enriched: 5/26/2026, 7:55:38 AM
Last updated: 5/26/2026, 7:55:41 AM
Views: 1
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.