CVE-2021-25669: Siemens Scalance x200-4p Irt Firmware

Critical severity, CVSS 9.8. EPSS: 2.1% chance of exploitation in the next 30 days.

A vulnerability has been identified in SCALANCE X200-4P IRT (All versions < 5.5.1), SCALANCE X201-3P IRT (All versions < 5.5.1), SCALANCE X201-3P IRT PRO (All versions < 5.5.1), SCALANCE X202-2 IRT (All versions < 5.5.1), SCALANCE X202-2P IRT (incl. SIPLUS NET variant) (All versions < 5.5.1), SCALANCE X202-2P IRT PRO (All versions < 5.5.1), SCALANCE X204 IRT (All versions < 5.5.1), SCALANCE X204 IRT PRO (All versions < 5.5.1), SCALANCE X204-2 (incl. SIPLUS NET variant) (All versions < V5.2.5), SCALANCE X204-2FM (All versions < V5.2.5), SCALANCE X204-2LD (incl. SIPLUS NET variant) (All versions < V5.2.5), SCALANCE X204-2LD TS (All versions < V5.2.5), SCALANCE X204-2TS (All versions < V5.2.5), SCALANCE X206-1 (All versions < V5.2.5), SCALANCE X206-1LD (All versions < V5.2.5), SCALANCE X208 (incl. SIPLUS NET variant) (All versions < V5.2.5), SCALANCE X208PRO (All versions < V5.2.5), SCALANCE X212-2 (incl. SIPLUS NET variant) (All versions < V5.2.5), SCALANCE X212-2LD (All versions < V5.2.5), SCALANCE X216 (All versions < V5.2.5), SCALANCE X224 (All versions < V5.2.5), SCALANCE XF201-3P IRT (All versions < 5.5.1), SCALANCE XF202-2P IRT (All versions < 5.5.1), SCALANCE XF204 (All versions < V5.2.5), SCALANCE XF204 IRT (All versions < 5.5.1), SCALANCE XF204-2 (incl. SIPLUS NET variant) (All versions < V5.2.5), SCALANCE XF204-2BA IRT (All versions < 5.5.1), SCALANCE XF206-1 (All versions < V5.2.5), SCALANCE XF208 (All versions < V5.2.5). Incorrect processing of POST requests in the web server may write out of bounds in stack. An attacker might leverage this to denial-of-service of the device or remote code execution.

Affected products

Siemens Scalance x200-4p Irt Firmware: before 5.5.1 (fixed in 5.5.1)
Siemens Scalance x201-3p Irt Firmware: before 5.5.1 (fixed in 5.5.1)
Siemens Scalance x201-3p Irt Pro Firmware: before 5.5.1 (fixed in 5.5.1)
Siemens Scalance x202-2 Irt Firmware: before 5.5.1 (fixed in 5.5.1)
Siemens Scalance x202-2p Irt Firmware: before 5.5.1 (fixed in 5.5.1)
Siemens Scalance x202-2p Irt Pro Firmware: before 5.5.1 (fixed in 5.5.1)
Siemens Scalance x204-2 Firmware: before 5.2.5 (fixed in 5.2.5)
Siemens Scalance x204-2fm Firmware: before 5.2.5 (fixed in 5.2.5)
Siemens Scalance x204-2ld Firmware: before 5.2.5 (fixed in 5.2.5)
Siemens Scalance x204-2ld Ts Firmware: before 5.2.5 (fixed in 5.2.5)
Siemens Scalance x204-2ts Firmware: before 5.2.5 (fixed in 5.2.5)
Siemens Scalance x204 Irt Firmware: before 5.5.1 (fixed in 5.5.1)
Siemens Scalance x204 Irt Pro Firmware: before 5.5.1 (fixed in 5.5.1)
Siemens Scalance x206-1 Firmware: before 5.2.5 (fixed in 5.2.5)
Siemens Scalance x206-1ld Firmware: before 5.2.5 (fixed in 5.2.5)
Siemens Scalance x208 Firmware: before 5.2.5 (fixed in 5.2.5)
Siemens Scalance x208pro Firmware: before 5.2.5 (fixed in 5.2.5)
Siemens Scalance x212-2 Firmware: before 5.2.5 (fixed in 5.2.5)
Siemens Scalance x212-2ld Firmware: before 5.2.5 (fixed in 5.2.5)
Siemens Scalance x216 Firmware: before 5.2.5 (fixed in 5.2.5)
Siemens Scalance x224 Firmware: before 5.2.5 (fixed in 5.2.5)
Siemens Scalance XF201-3p Irt Firmware: before 5.5.1 (fixed in 5.5.1)
Siemens Scalance XF202-2p Irt Firmware: before 5.5.1 (fixed in 5.5.1)
Siemens Scalance XF204-2 Firmware: before 5.2.5 (fixed in 5.2.5)
Siemens Scalance XF204-2ba Irt Firmware: before 5.5.1 (fixed in 5.5.1)
and 4 more

Published 2021-04-22. Last modified 2026-06-17.