A vulnerability has been identified in CP-8031 MASTER MODULE (All versions < CPCI85 V05), CP-8050 MASTER MODULE (All versions < CPCI85 V05).

published 2023-06-13 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-38071

cvss: 6.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits: 0; none known

A vulnerability has been identified in CP-8031 MASTER MODULE (All versions < CPCI85 V05), CP-8050 MASTER MODULE (All versions < CPCI85 V05). The affected devices contain an exposed UART console login interface. An attacker with direct physical access could try to bruteforce or crack the root password to login to the device.

Patch / fix

fixed in 1 links 1

siemens cpci85_firmware v05

cert-portal.siemens.com/productcert/pdf/ssa-731916.pdf advisory

Vendor advisories

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

cisa ICSA-23-166-13 updated 2023-06-13 cvss 6.8

Siemens SICAM A8000 Devices

Siemens CP-8031 MASTER MODULE (6MF2803-1AA00) <vers:/_CPCI85_V05 Siemens CP-8050 MASTER MODULE (6MF2805-0AA00) <vers:/_CPCI85_V05
affected: vendor fix 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: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 22 mo ago (2025-01-02)

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.8	CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
CNA	3.1	6.8	CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	6.8	CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Siemens CP-8031 MASTER MODULE
Siemens CP-8050 MASTER MODULE

Classification

Weakness

CWE-749 Exposed Dangerous Method or Function

References

Sources

CVE List CVE-2023-33921
NVD CVE-2023-33921

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