CVE-2021-25668 Memory corruption in SCALANCE X200-4P IRT

Q: Is CVE-2021-25668 being exploited?

There is no known exploitation of CVE-2021-25668 in the wild and no public exploit code.

Q: How do I fix CVE-2021-25668?

No fix has been published for CVE-2021-25668 yet. Limit exposure of the affected software until one is available.

Critical 9.8 Published 22 Apr 2021 Updated 3 Aug 2024

Incorrect POST request processing in Siemens SCALANCE switches allows heap out-of-bounds writes, enabling remote code execution or denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-25668?

CVE-2021-25668 is a critical memory corruption vulnerability in Siemens SCALANCE X200-4P IRT, published on 22 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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 webserver may result in write out of bounds in heap. An attacker might leverage this to cause denial-of-service on the device and potentially remotely execute code.

Weakness: CWE-787, CWE-122

Which versions are affected by CVE-2021-25668?

It affects 29 products.

Products include Siemens Scalance X200-4p Irt Firmware, Siemens Scalance X201-3p Irt Firmware, Siemens Scalance X201-3p Irt Pro Firmware, Siemens Scalance X202-2 Irt Firmware, Siemens Scalance X202-2p Irt Firmware, Siemens Scalance X202-2p Irt Pro Firmware and 23 more.

How do I fix CVE-2021-25668?

No fix has been published for CVE-2021-25668 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-25668 being exploited?

There is no known exploitation of CVE-2021-25668 in the wild and no public exploit code.

Sources

Also known as GHSA-6c9x-5xpr-57p9.