CVE-2021-25661 Memory corruption in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants)
A malicious VNC server can trigger an out-of-bounds memory access in the client, causing a Denial-of-Service condition on Siemens HMI panels.
- 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-2021-25661?
CVE-2021-25661 is a high-severity memory corruption vulnerability in Siemens SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants), published on 12 May 2021. 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 SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Outdoor Panels V16 7\" & 15\" (incl. SIPLUS variants) (All versions < V16 Update 4), SIMATIC HMI Comfort Panels V15 4\" - 22\" (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Panels V16 4\" - 22\" (incl. SIPLUS variants) (All versions < V16 Update 4), SIMATIC HMI KTP Mobile Panels V15 KTP400F, KTP700, KTP700F, KTP900 and KTP900F (All versions < V15.1 Update 6), SIMATIC HMI KTP Mobile Panels V16 KTP400F, KTP700, KTP700F, KTP900 and KTP900F (All versions < V16 Update 4), SIMATIC WinCC Runtime Advanced V15 (All versions < V15.1 Update 6), SIMATIC WinCC Runtime Advanced V16 (All versions < V16 Update 4). SmartVNC has an out-of-bounds memory access vulnerability that could be triggered on the client side when sending data from the server, which could result in a Denial-of-Service condition.
Weakness: CWE-788
Which versions are affected by CVE-2021-25661?
It affects 10 products.
Products include Siemens Simatic Hmi Comfort Outdoor Panels 15\" Firmware, Siemens Simatic Hmi Comfort Outdoor Panels 7\" Firmware, Siemens Simatic Hmi Comfort Panels 22\" Firmware, Siemens Simatic Hmi Comfort Panels 4\" Firmware, Siemens Simatic Hmi Ktp Mobile Panels Ktp400f Firmware, Siemens Simatic Hmi Ktp Mobile Panels Ktp700 Firmware and 4 more.
How do I fix CVE-2021-25661?
No fix has been published for CVE-2021-25661 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-2021-25661 being exploited?
There is no known exploitation of CVE-2021-25661 in the wild and no public exploit code.
Other vulnerabilities in Siemens SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants)
- CVE-2021-27384 Memory corruption in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants)
- CVE-2021-25660 Memory corruption in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants)
- CVE-2021-25662 Denial of service in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants)
- CVE-2021-27383 Denial of service in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants)
- CVE-2021-27385 Denial of service in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants)
Sources
Also known as GHSA-vjhx-rh6c-wf22.