CVE-2023-31277Network attack vector

Credential disclosure via plaintext network transmission

Published Jul 6, 2023 · Updated Nov 14, 2024

Unprotected credential transport in PiiGAB M-Bus SoftwarePack 900S allows man-in-the-middle attackers to read credentials. The software sends authentication credentials without transport protection from the 900S gateway, exposing plaintext to observers on the communication path. Exploitation requires network-path visibility; published sources do not identify the protocol or request locus, and the reported impact is limited to credential disclosure.

CVSS severity7.5
High
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unprotected credential transport in PiiGAB M-Bus SoftwarePack 900S allows man-in-the-middle attackers to read credentials. The software sends authentication credentials without transport protection from the 900S gateway, exposing plaintext to observers on the communication path. Exploitation requires network-path visibility; published sources do not identify the protocol or request locus, and the reported impact is limited to credential disclosure.

The record

CVE
CVE-2023-31277
Published
Jul 6, 2023
Updated
Nov 14, 2024
Vendor
PiiGAB
Product
M-Bus SoftwarePack
Classifications
CWE-523, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 14, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=900S

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PiiGAB · M-Bus SoftwarePackversion=900S
PiiGAB · PiiGAB M-Bus 900Sversion=900s

Published CVSS scores

7.5CISA ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-523Unprotected Transport of Credentials
T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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