Stack-based buffer overflow in Siemens products - CVE-2021-25669

Vulnerability identifier: #VU52215

CSH Severity: High

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

CVE-ID: CVE-2021-25669

CWE-ID: CWE-121

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
SCALANCE X204-2
SCALANCE X204-2FM
SCALANCE X204-2LD
SCALANCE X204-2LD TS
SCALANCE X204-2TS
SCALANCE X206-1
SCALANCE X206-1LD
SCALANCE X208
SCALANCE X208PRO
SCALANCE X212-2
SCALANCE X212-2LD
SCALANCE X216
SCALANCE X224
SCALANCE XF204
SCALANCE XF204-2
SCALANCE XF206-1
SCALANCE XF208
SCALANCE X200-4P IRT
SCALANCE X201-3P IRT
SCALANCE X201-3P IRT PRO
SCALANCE X202-2 IRT
SCALANCE X202-2P IRT
SCALANCE X202-2P IRT PRO
SCALANCE X204 IRT
SCALANCE X204 IRT PRO
SCALANCE XF201-3P IRT
SCALANCE XF202-2P IRT
SCALANCE XF204 IRT
SCALANCE XF204-2BA IRT

Software vendor:
Siemens

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing POST requests in the web server. A remote unauthenticated attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Install updates from vendor's website.

• https://ics-cert.us-cert.gov/advisories/icsa-21-103-07
• https://cert-portal.siemens.com/productcert/pdf/ssa-187092.pdf