What is CVE-2023-31277?

CVE-2023-31277 is a high-severity vulnerability in Piigab M-Bus 900s, classified under Unprotected Transport of Credentials. CVSS score: 7.5/10. Published 2023-07-06.

How severe is CVE-2023-31277?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Piigab M-Bus 900s

CVE-2023-31277

PiiGAB M-Bus transmits credentials in plaintext format.

Published 2023-07-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (46.5th percentile), scored 2026-10-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Piigab M-Bus 900s
Piigab M-Bus 900s Firmware
Piigab M-Bus Softwarepack — versions 900S

Weakness classification (CWE)

CWE-523 — Unprotected Transport of Credentials

References

www.cisa.gov/news-events/ics-advisories/icsa-23-187-01 (US Government Resource, Third Party Advisory)

Frequently asked questions

What is CVE-2023-31277?: CVE-2023-31277 is a high-severity vulnerability in Piigab M-Bus 900s, classified under Unprotected Transport of Credentials. CVSS score: 7.5/10. Published 2023-07-06.
How severe is CVE-2023-31277?: High severity. CVSS v3 base score is 7.5 out of 10.