CVE-2021-25669: 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 ...

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.13%

79.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Siemens	Scalance X200-4p Irt Firmware	< 5.5.1
Siemens	Scalance X201-3p Irt Firmware	< 5.5.1
Siemens	Scalance X201-3p Irt Pro Firmware	< 5.5.1
Siemens	Scalance X202-2 Irt Firmware	< 5.5.1
Siemens	Scalance X202-2p Irt Pro Firmware	< 5.5.1
Siemens	Scalance X204 Irt Firmware	< 5.5.1
Siemens	Scalance X204 Irt Pro Firmware	< 5.5.1
Siemens	Scalance X204-2 Firmware	< 5.2.5
Siemens	Scalance X204-2fm Firmware	< 5.2.5
Siemens	Scalance X204-2ld Firmware	< 5.2.5
Siemens	Scalance X204-2ld Ts Firmware	< 5.2.5
Siemens	Scalance X204-2ts Firmware	< 5.2.5
Siemens	Scalance X206-1 Firmware	< 5.2.5
Siemens	Scalance X206-1ld Firmware	< 5.2.5
Siemens	Scalance X208 Firmware	< 5.2.5
Siemens	Scalance X208pro Firmware	< 5.2.5
Siemens	Scalance X212-2 Firmware	< 5.2.5
Siemens	Scalance X212-2ld Firmware	< 5.2.5
Siemens	Scalance X216 Firmware	< 5.2.5
Siemens	Scalance X224 Firmware	< 5.2.5
Siemens	Scalance Xf201-3p Irt Firmware	< 5.5.1
Siemens	Scalance Xf202-2p Irt Firmware	< 5.5.1
Siemens	Scalance Xf204 Firmware	< 5.2.5
Siemens	Scalance Xf204 Irt Firmware	< 5.5.1
Siemens	Scalance Xf204-2 Firmware	< 5.2.5
Siemens	Scalance Xf204-2ba Irt Firmware	< 5.5.1
Siemens	Scalance Xf206-1 Firmware	< 5.2.5
Siemens	Scalance Xf208 Firmware	< 5.2.5
Siemens	Scalance X202-2p Irt Firmware	< 5.5.1

References

https://cert-portal.siemens.com/productcert/pdf/ssa-187092.pdfPatch, Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-187092.pdfPatch, Vendor Advisory

Timeline

Published: Apr 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-25669?

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.

How severe is CVE-2021-25669?

CVE-2021-25669 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.13% probability of exploitation in the next 30 days.

How do I fix CVE-2021-25669?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.