Quick answers
- Is CVE-2026-12661 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-12661 being exploited in the wild.
- How severe is CVE-2026-12661?
- Informational severity, with a CVSS score of 4.5, published 1 September 2026.
- Which products and versions are affected?
- Rockwell Automation FactoryTalk Historian Machine Edition Series B 5.202, Series C 7.101.
- Is there a fix for CVE-2026-12661?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-12661 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-12661?
- Check whether you run Rockwell Automation FactoryTalk Historian Machine Edition at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
This vulnerability is a stack-based buffer overflow (CWE-121) in FactoryTalk Historian Machine Edition's web interface. An attacker with low-level authentication credentials and network adjacency can send specially crafted requests that trigger the overflow condition. The overflow causes a denial-of-service condition, crashing the device and making it unresponsive until manually recovered. The vulnerability affects Historian ME Series B (version 5.202) and Series C (version 7.101), with fixes available in Series B version 5.203 and Series C version 7.102. No public exploit code is known, and patches are available.
Affected products
- Rockwell Automation FactoryTalk Historian Machine Edition Series B 5.202, Series C 7.101
Timeline
- 2026-09-01: disclosed: Security advisory SD1796 published