CVE-2023-35987Network attack vector

Unauthenticated access via hard-coded credentials

Published Jul 6, 2023 · Updated Nov 13, 2024

Hard-coded credentials in PiiGAB M-Bus SoftwarePack 900S allow remote attackers to authenticate over the network. The public advisory does not identify the credential, its storage locus, or the authentication path that accepts it. Network reachability is sufficient, no prior account or user interaction is required, and successful authentication grants the embedded account's access.

CVSS severity9.8
Critical
EPSS probability0.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded credentials in PiiGAB M-Bus SoftwarePack 900S allow remote attackers to authenticate over the network. The public advisory does not identify the credential, its storage locus, or the authentication path that accepts it. Network reachability is sufficient, no prior account or user interaction is required, and successful authentication grants the embedded account's access.

The record

CVE
CVE-2023-35987
Published
Jul 6, 2023
Updated
Nov 13, 2024
Vendor
PiiGAB
Product
M-Bus SoftwarePack
Classifications
CWE-798, T0859
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 13, 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

9.8ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T0859Valid Accounts

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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