CVE-2022-26647 Weak cryptography in SCALANCE X200-4P IRT

Q: Is CVE-2022-26647 being exploited?

There is no known exploitation of CVE-2022-26647 in the wild and no public exploit code.

Q: How do I fix CVE-2022-26647?

No fix has been published for CVE-2022-26647 yet. Limit exposure of the affected software until one is available.

High 8.8 Published 12 Jul 2022 Updated 21 Apr 2025

An attacker can brute-force insecurely generated session IDs to hijack existing sessions on Siemens SCALANCE industrial switches.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2022-26647?

CVE-2022-26647 is a high-severity vulnerability in Siemens SCALANCE X200-4P IRT, published on 12 Jul 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

A vulnerability has been identified in SCALANCE X200-4P IRT (All versions < V5.5.2), SCALANCE X201-3P IRT (All versions < V5.5.2), SCALANCE X201-3P IRT PRO (All versions < V5.5.2), SCALANCE X202-2IRT (All versions < V5.5.2), SCALANCE X202-2IRT (All versions < V5.5.2), SCALANCE X202-2P IRT (All versions < V5.5.2), SCALANCE X202-2P IRT PRO (All versions < V5.5.2), SCALANCE X204-2 (All versions < V5.2.6), SCALANCE X204-2FM (All versions < V5.2.6), SCALANCE X204-2LD (All versions < V5.2.6), SCALANCE X204-2LD TS (All versions < V5.2.6), SCALANCE X204-2TS (All versions < V5.2.6), SCALANCE X204IRT (All versions < V5.5.2), SCALANCE X204IRT (All versions < V5.5.2), SCALANCE X204IRT PRO (All versions < V5.5.2), SCALANCE X206-1 (All versions < V5.2.6), SCALANCE X206-1LD (All versions < V5.2.6), SCALANCE X208 (All versions < V5.2.6), SCALANCE X208PRO (All versions < V5.2.6), SCALANCE X212-2 (All versions < V5.2.6), SCALANCE X212-2LD (All versions < V5.2.6), SCALANCE X216 (All versions < V5.2.6), SCALANCE X224 (All versions < V5.2.6), SCALANCE XF201-3P IRT (All versions < V5.5.2), SCALANCE XF202-2P IRT (All versions < V5.5.2), SCALANCE XF204 (All versions < V5.2.6), SCALANCE XF204-2 (All versions < V5.2.6), SCALANCE XF204-2BA IRT (All versions < V5.5.2), SCALANCE XF204IRT (All versions < V5.5.2), SCALANCE XF206-1 (All versions < V5.2.6), SCALANCE XF208 (All versions < V5.2.6). The webserver of affected devices calculates session ids and nonces in an insecure manner. This could allow an unauthenticated remote attacker to brute-force session ids and hijack existing sessions.

Weakness: CWE-330

Which versions are affected by CVE-2022-26647?

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 X202-2irt Firmware, Siemens Scalance X202-2p Irt Firmware, Siemens Scalance X202-2p Irt Pro Firmware and 23 more.

How do I fix CVE-2022-26647?

No fix has been published for CVE-2022-26647 yet. Limit exposure of the affected software until one is available.

Is CVE-2022-26647 being exploited?

There is no known exploitation of CVE-2022-26647 in the wild and no public exploit code.

Sources

Also known as GHSA-q6mm-xfgf-gjr7.