Dashboard / CVE-2023-35921

CVE-2023-35921

HIGH
MEDIUM Priority: 0.06 BB Relevance: 75/100
Published: 2023-07-11 Modified: 2026-10-23 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Unchanged
C: None
I: None
A: High

Description

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 Ethernet frames 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.

Weakness Classification (1)

Affected Software (6)

VendorProductVersion
siemens simatic_mv540_h_firmware < 3.3.4
siemens simatic_mv540_s_firmware < 3.3.4
siemens simatic_mv550_h_firmware < 3.3.4
siemens simatic_mv550_s_firmware < 3.3.4
siemens simatic_mv560_u_firmware < 3.3.4
siemens simatic_mv560_x_firmware < 3.3.4

References & Advisories (1)

Bug Bounty Relevance

75 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

7.5 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploitation Probability

0.87%
Raw Score 0.008660
Percentile 58.6%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00866
2026-10-28
0.00866

Intelligence Sources

nvd ref →

External Links