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Fencer Vulns
high 7.5

CVE-2022-33138 json

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-2022-36189

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

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). Affected devices do not perform authentication for several web API endpoints. This could allow an unauthenticated remote attacker to read and download data from the device.

Patch / fix

  • 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

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 cvss 7.5

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

1.35% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

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-306 Missing Authentication for Critical Functionality

References

Sources

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.