A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3), SIMATIC MV540 S (All versions < V3.3), SIMATIC MV550 H (All v…

published 2022-07-12 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-36188

cvss: 8.0; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 58%
public exploits: 0; none known

A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3), SIMATIC MV540 S (All versions < V3.3), SIMATIC MV550 H (All versions < V3.3), SIMATIC MV550 S (All versions < V3.3), SIMATIC MV560 U (All versions < V3.3), SIMATIC MV560 X (All versions < V3.3). The web session management of affected devices does not invalidate session ids in certain logout scenarios. This could allow an authenticated remote attacker to hijack other users' sessions.

Patch / fix

fixed in 6 links 1

siemens simatic_mv540_h_firmware 3.3
siemens simatic_mv540_s_firmware 3.3
siemens simatic_mv550_h_firmware 3.3
siemens simatic_mv550_s_firmware 3.3
siemens simatic_mv560_u_firmware 3.3
siemens simatic_mv560_x_firmware 3.3

cert-portal.siemens.com/productcert/pdf/ssa-348662.pdf advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-22-195-03 updated 2022-07-12 cvss 8.0

Siemens SIMATIC MV500 Devices

Siemens SIMATIC MV540 H <V3.3 Siemens SIMATIC MV540 S <V3.3 Siemens SIMATIC MV550 H <V3.3 Siemens SIMATIC MV550 S <V3.3 Siemens SIMATIC MV560 U <V3.3 Siemens SIMATIC MV560 X <V3.3
affected: fixed in V3.3 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

0.86% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.0	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	6.0	AV:N/AC:M/Au:S/C:P/I:P/A:P

Affected products

Siemens SIMATIC MV540 H
Siemens SIMATIC MV540 S
Siemens SIMATIC MV550 H
Siemens SIMATIC MV550 S
Siemens SIMATIC MV560 U
Siemens SIMATIC MV560 X

Classification

Weakness

CWE-613 DEPRECATED: Insufficient Session Expiration

References

cert-portal.siemens.com /productcert/pdf/ssa-348662.pdf
patch, vendor-advisory

Sources

CVE List CVE-2022-33137
NVD CVE-2022-33137

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary