CVE Intelligence
Low

CVE-2023-27408 — A vulnerability has been identified in SCALANCE LPE9403 (All versions < V2.1). The `i2c` mutex...

A vulnerability has been identified in SCALANCE LPE9403 (All versions < V2.1). The `i2c` mutex file is created with the permissions bits of `-rw-rw-rw-`. This file is used as a mutex for multiple applications interacting with i2c. This could allow an authenticated attacker with access to the SSH interface on the affected device to interfere with the integrity of the mutex and the data it protects.

Published May 9, 2023 · Updated Oct 23, 2026 · Sources: CVE Program (cve.org) e CISA ADP, NIST National Vulnerability Database, GitHub Security Advisories · CNA: siemens

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
0.17%
ahead of 6% of scored CVEs · Oct 24, 2026
Affects
Siemens
SCALANCE LPE9403 and 1 more
CVSS base
3.3
Low · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
None
none · proof-of-concept · active
Automatable
No
can an attacker script the kill-chain steps
Technical impact
Partial
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Siemens SCALANCE LPE9403, Siemens Scalance Lpe9403 Firmware).
  2. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
  3. Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Siemens SCALANCE LPE9403 version All versions < V2.1 Vulnerable CVE Program (cve.org) e CISA ADP
Siemens Scalance Lpe9403 Firmware < 2.1 Vulnerable NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
3.3 CVSS 3.1 Low 1.8 1.4 productcert@siemens.com via NIST National Vulnerability Database
3.3 CVSS 3.1 Low — — GitHub, Inc. via GitHub Security Advisories
3.3 CVSS 3.1 Low — — siemens via CVE Program (cve.org) e CISA ADP
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N (score shown at the top: productcert@siemens.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-378

Other CVEs with this weakness →

EPSS over time FIRST

Oct 23, 2026 → Oct 24, 2026 · 2 reading(s) · max 0.17%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

  • 2026
  • Affected products added · siemens/scalance lpe9403 firmware
    Oct 23, 2026 · NIST National Vulnerability Database
  • Source status changed · Published → Modified
    Oct 23, 2026 · NIST National Vulnerability Database
  • Record published
    Oct 23, 2026
  • Affected products added · siemens/scalance lpe9403
    Oct 23, 2026 · CVE Program (cve.org) e CISA ADP
  • CVSS changed · 3.3
    Oct 23, 2026 · CVE Program (cve.org) e CISA ADP
  • Source status changed · → Published
    Oct 23, 2026 · CVE Program (cve.org) e CISA ADP
  • SSVC assessment updated
    Oct 23, 2026 · CVE Program (cve.org) e CISA ADP
  • Record created in this database
    Oct 23, 2026 · Alertas do Telegram
  • 2023
  • CVE published
    May 9, 2023 · siemens

Source activity

Repeated readings are counted rather than listed.

  • 2× References added · Oct 23, 2026 – Oct 23, 2026
  • 1× Official description updated · Oct 23, 2026 – Oct 23, 2026

References

3 on the record

Elsewhere on this site

Siemens
every CVE for this vendor
CWE-378
other pages naming this weakness

Related CVEs (same products)

  • CVE-2023-27407 A vulnerability has been identified in SCALANCE LPE9403 (All versions < V2.1). The web based... May 9, 2023
  • CVE-2023-27409 A vulnerability has been identified in SCALANCE LPE9403 (All versions < V2.1). A path traversal... May 9, 2023
  • CVE-2022-0847 Linux Kernel Privilege Escalation Vulnerability KEV Mar 10, 2022
  • CVE-2021-4034 Red Hat Polkit Out-of-Bounds Read and Write Vulnerability KEV Jan 28, 2022
  • CVE-2021-3449 NULL pointer deref in signature_algorithms processing Mar 25, 2021

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No fixed version, patch or mitigation documented.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2023-27408 is "A vulnerability has been identified in SCALANCE LPE9403 (All versions < V2.1). The `i2c` mutex...", rated Low. It affects SCALANCE LPE9403 (Siemens); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 3.3 describes technical severity. EPSS 0.17% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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