CVE-2026-27664 Memory corruption in CPCI85 Central Processing/Communication
An unauthenticated attacker can cause a denial-of-service condition in Siemens CPCI85 and SICORE systems by sending malicious XML requests that trigger an out-of-bounds write.
- 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-2026-27664?
CVE-2026-27664 is a high-severity memory corruption vulnerability in Siemens CPCI85 Central Processing/Communication, published on 26 Mar 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 CPCI85 Central Processing/Communication (All versions < V26.10), SICORE Base system (All versions < V26.10.0). The affected application contains an out-of-bounds write vulnerability while parsing specially crafted XML inputs. This could allow an unauthenticated attacker to exploit this issue by sending a malicious XML request, which may cause the service to crash, resulting in a denial-of-service condition.
Weakness: CWE-787
Which versions are affected by CVE-2026-27664?
How do I fix CVE-2026-27664?
No fix has been published for CVE-2026-27664 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-27664 being exploited?
There is no known exploitation of CVE-2026-27664 in the wild and no public exploit code.
Sources
Also known as GHSA-4m3q-v5m4-mc2x.