CVE-2026-3509: CWE-134 Use of Externally-Controlled Format String in CODESYS CODESYS Control RTE (SL)
CVE-2026-3509 is a high-severity vulnerability in CODESYS Control RTE (SL) version 3.5.17.0. It involves an unauthenticated remote attacker potentially controlling the format string of messages processed by the Audit Log, which can lead to a denial-of-service (DoS) condition. The vulnerability does not impact confidentiality or integrity but affects availability. No patch or official fix information is provided in the available data.
AI Analysis
Technical Summary
This vulnerability (CWE-134) in CODESYS Control RTE (SL) version 3.5.17.0 allows an unauthenticated remote attacker to manipulate the format string used in Audit Log message processing. Such control over format strings can cause the system to crash or become unresponsive, resulting in a denial-of-service condition. The CVSS 3.1 base score is 7.5, reflecting network attack vector, low attack complexity, no privileges or user interaction required, and impact limited to availability.
Potential Impact
An attacker can cause a denial-of-service (DoS) by exploiting the format string vulnerability in the Audit Log processing component. There is no impact on confidentiality or integrity according to the CVSS vector. The system availability is affected, potentially disrupting operations relying on CODESYS Control RTE (SL) 3.5.17.0.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch information is available in the provided data. Until a patch is available, monitor vendor communications for updates and consider restricting network access to the affected system to reduce exposure.
CVE-2026-3509: CWE-134 Use of Externally-Controlled Format String in CODESYS CODESYS Control RTE (SL)
Description
CVE-2026-3509 is a high-severity vulnerability in CODESYS Control RTE (SL) version 3.5.17.0. It involves an unauthenticated remote attacker potentially controlling the format string of messages processed by the Audit Log, which can lead to a denial-of-service (DoS) condition. The vulnerability does not impact confidentiality or integrity but affects availability. No patch or official fix information is provided in the available data.
CVSS v3.1
Score 7.5high
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
This vulnerability (CWE-134) in CODESYS Control RTE (SL) version 3.5.17.0 allows an unauthenticated remote attacker to manipulate the format string used in Audit Log message processing. Such control over format strings can cause the system to crash or become unresponsive, resulting in a denial-of-service condition. The CVSS 3.1 base score is 7.5, reflecting network attack vector, low attack complexity, no privileges or user interaction required, and impact limited to availability.
Potential Impact
An attacker can cause a denial-of-service (DoS) by exploiting the format string vulnerability in the Audit Log processing component. There is no impact on confidentiality or integrity according to the CVSS vector. The system availability is affected, potentially disrupting operations relying on CODESYS Control RTE (SL) 3.5.17.0.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch information is available in the provided data. Until a patch is available, monitor vendor communications for updates and consider restricting network access to the affected system to reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- CERTVDE
- Date Reserved
- 2026-03-04T09:24:19.745Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 69c244c0f4197a8e3b01d2db
Added to database: 03/24/2026, 08:01:04 UTC
Last enriched: 06/18/2026, 18:30:31 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 204
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.