Access of Memory Location After End of Buffer in Siemens products - CVE-2021-25661

Vulnerability identifier: #VU53142

CSH Severity: Medium

CVSS v4: 5.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-25661

CWE-ID: CWE-788

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error. A remote authenticated attacker can send a specially crafted data and cause a denial of service condition on the target system.

SIMATIC HMI Comfort Outdoor Panels 7” & 15”
SIMATIC HMI Comfort Panels 4”-22”
SIMATIC HMI KTP400F
SIMATIC HMI KTP700
SIMATIC HMI KTP700F
SIMATIC HMI KTP900
SIMATIC HMI KTP900F
SIMATIC WinCC Runtime Advanced

Install updates from vendor's website.

SIMATIC HMI Comfort Outdoor Panels 7” & 15” - update to 16 Update 4
SIMATIC HMI Comfort Panels 4”-22” - update to 16 Update 4
SIMATIC HMI KTP400F - update to 16 Update 4
SIMATIC HMI KTP700 - update to 16 Update 4
SIMATIC HMI KTP700F - update to 16 Update 4
SIMATIC HMI KTP900 - update to 16 Update 4
SIMATIC HMI KTP900F - update to 16 Update 4
SIMATIC WinCC Runtime Advanced - update to 16 Update 4

• https://ics-cert.us-cert.gov/advisories/icsa-21-131-12
• https://cert-portal.siemens.com/productcert/pdf/ssa-538778.pdf

• Multiple vulnerabilities in Siemens SIMATIC SmartVNC HMI WinCC Products