Skip to content
Fencer Vulns
high 7.5

CVE-2023-35920 json

A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3.4), SIMATIC MV540 S (All versions < V3.3.4), SIMATIC MV550 H (A…

published 2023-07-11 3 y ago modified 2026-10-23 16 d ago also EUVD-2023-39911

cvss
7.5
version 3.1, CNA
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

Summary

A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3.4), SIMATIC MV540 S (All versions < V3.3.4), SIMATIC MV550 H (All versions < V3.3.4), SIMATIC MV550 S (All versions < V3.3.4), SIMATIC MV560 U (All versions < V3.3.4), SIMATIC MV560 X (All versions < V3.3.4). Affected devices cannot properly process specially crafted IP packets sent to the devices. This could allow an unauthenticated remote attacker to cause a denial of service condition. The affected devices must be restarted manually.

Patch / fix

  • siemens simatic_mv540_h V3.3.4
  • siemens simatic_mv540_s V3.3.4
  • siemens simatic_mv550_h V3.3.4
  • siemens simatic_mv550_s V3.3.4
  • siemens simatic_mv560_u V3.3.4
  • siemens simatic_mv560_x V3.3.4

Vendor advisories

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

cisa ICSA-23-194-04 updated cvss 7.5

Siemens SIMATIC MV500 Devices

  • Siemens SIMATIC MV540 H (6GF3540-0GE10) <V3.3.4 Siemens SIMATIC MV540 S (6GF3540-0CD10) <V3.3.4 Siemens SIMATIC MV550 H (6GF3550-0GE10) <V3.3.4 Siemens SIMATIC MV550 S (6GF3550-0CD10) <V3.3.4 Siemens SIMATIC MV560 U (6GF3560-0LE10) <V3.3.4 Siemens SIMATIC MV560 X (6GF3560-0HE10) <V3.3.4
    affected: fixed in V3.3.4 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

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
23 mo ago

Exploit prediction

0.87% 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
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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
  • 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-400 Uncontrolled Resource Consumption

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.