CVE-2026-62647 Weak cryptography in Reyrolle 7SR5
An attacker can predict session identifiers due to weak random number generation, allowing unauthorized access and impersonation of legitimate users on the device.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-62647?
CVE-2026-62647 is a critical vulnerability in Siemens Reyrolle 7SR5, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability has been identified in Reyrolle 7SR5 (All versions < V2.70). A random number generator is used to generate security-relevant values (such as session identifiers used for authentication purposes) that is not initialized with a True Random Number Generator (TRNG), resulting in a predictable sequence of generated values. This could allow an unauthenticated remote attacker to more easily predict the generated values and impersonate a legitimate authenticated user, potentially gaining unauthorized access to the device.
Weakness: CWE-20
Which versions are affected by CVE-2026-62647?
How do I fix CVE-2026-62647?
No fix has been published for CVE-2026-62647 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-62647 being exploited?
There is no known exploitation of CVE-2026-62647 in the wild and no public exploit code.
Sources
Also known as GHSA-677f-mg3g-pgv2.