Buffer overflow in Siemens products - CVE-2021-27386

Vulnerability identifier: #VU53147

CSH Severity: Medium

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2021-27386

CWE-ID: CWE-119

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
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

Software vendor:
Siemens

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

The vulnerability exists due to a boundary error in the device layout handler on client side. A remote attacker can trigger memory corruption and cause a denial of service condition on the target system.

Install updates from vendor's website.

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