Skip to main content
Public proof of conceptFix available

CVE-2023-33921

A public proof of concept exists; no exploitation attested.

  • Published2023-06-13
  • Fixed inv05
  • WeaknessCWE-749

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2023-06-1309:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-33921?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-33921?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Siemens cpci85 firmwareversion to verify
BranchAffectedFixed in
5.x< v05v05

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • ICSA-23-166-13 CISA2 known affected

    Siemens SICAM A8000 Devices

    CP-8031 MASTER MODULE (6MF2803-1AA00) · CP-8050 MASTER MODULE (6MF2805-0AA00)

Full record on NVD

Fix

  1. Update Siemens cpci85 firmware to v05
  2. Vendor fix CISA ICSA-23-166-13 · 1 productUpdate to CPCI85 V05 or later version

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionpoc2025-01-02
  • OpenCVESSVC decisionpoc—
  • CNACVSS 3.16.8read 2026-10-23
  • NVDCVSS 3.16.8read 2026-10-23
  • CNAweakness (CWE)CWE-749read 2026-10-23
  • FIRST EPSSEPSS score0.4 %2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2023-06-13
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2023-33921?

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.

Is CVE-2023-33921 actively exploited?

A proof-of-concept exploit exists for CVE-2023-33921, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2023-33921?

CVE-2023-33921 has a CVSS v3 base score of 6.8 (MEDIUM severity), with vector string CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Running CP-8031 MASTER MODULE (All? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, October 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database