Cyber Resilience

CVE-2023-31277

Piigab M-Bus 900S Firmware

Published
06 July 2023
Modified
21 November 2024
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS Score 0.0057 44th percentile
Risk Priority 58 floored blend · peak EPSS

Summary

CVE-2023-31277 is a high-severity Unprotected Transport of Credentials (CWE-523) vulnerability in Piigab M-Bus 900S Firmware. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Network Sniffing (T1040); ranked at the 44th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A04:2025 Cryptographic Failures

EU & UK References

Vulnerability Data

PiiGAB M-Bus transmits credentials in plaintext format.

CWE(s)
CWE-523

Related Threats

MITRE ATT&CK Enterprise Techniques

T1040 Network Sniffing Credential Access
Adversaries may passively sniff network traffic to capture information about an environment, including authentication material passed over the network.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-35987Same product: Piigab M-Bus 900S
CVE-2023-34995Same product: Piigab M-Bus 900S
CVE-2023-34433Same product: Piigab M-Bus 900S
CVE-2023-33868Same product: Piigab M-Bus 900S
CVE-2023-35120Same product: Piigab M-Bus 900S
CVE-2023-32652Same product: Piigab M-Bus 900S
CVE-2023-36859Same product: Piigab M-Bus 900S
CVE-2023-35765Same product: Piigab M-Bus 900S
CVE-2026-23635Shared CWE-523
CVE-2026-56587Shared CWE-523

Affected Assets

piigab
m-bus 900s firmware
all versions

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

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Detect
Catch it (NIST detect / respond)

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Harden
Shrink the surface (DISA STIG)
  • 5 hardening rules · 3 OS baselines
Validate
Prove the fix (OWASP ASVS)

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Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-37 Out-of-band Channels
addresses: CWE-523

Using a distinct channel for credential transmission prevents unprotected transport over the application's normal communication path.

SC-8 Transmission Confidentiality and Integrity
addresses: CWE-523

Requiring protected transport for credentials directly mitigates unprotected credential transmission over networks.

SC-9 Transmission Confidentiality
addresses: CWE-523

Prevents unprotected transport of credentials by mandating confidentiality mechanisms such as TLS for all sensitive data flows.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.DS-02 full match
prevents

Encryption of data-in-transit directly prevents exposure of credentials during login.

PR.AA-04 mostly match
prevents

Protecting identity assertions in transit covers credential transport but is narrower than the full control scope.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.24 Use of cryptography mostly match
prevents

Requires use of cryptography, directly enabling encryption of credentials in transit.

A.5.14 Information transfer partial match
prevents

Requires secure information transfer, which can include protecting credentials in transit.

A.5.17 Authentication information partial match
degrades

Addresses management of authentication information, indirectly supporting protection during transmission.

A.8.20 Networks security partial match
prevents

Requires network security controls that can protect credential transmission.

A.8.21 Security of network services partial match
prevents

Addresses security of network services, which may include protecting authentication traffic.

A.8.26 Application security requirements partial match
prevents

Specifies application security requirements that can include secure credential transmission.

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (authoritative rows only; rows rated `none` are excluded).

RHEL 8 (2 rules)
  • V-230487 RHEL 8 must not have the telnet-server package installed. prevents CWE-523
  • V-230492 RHEL 8 must not have the rsh-server package installed. prevents CWE-523

References