Medium Input validation

CVE-2025-40935 — Improper Input Validation in Siemens RUGGEDCOM RMC8388 V5.X

A vulnerability has been identified in RUGGEDCOM RMC8388 V5.X (All versions < V5.10.1), RUGGEDCOM RS416Pv2 V5.X (All versions < V5.10.1), RUGGEDCOM RS416v2 V5.X (All versions < V5.10.1), RUGGEDCOM RS900 (32M) V5.X (All versions < V5.10.1), RUGGEDCOM RS900G (32M) V5.X (All versions < V5.10.1), RUGGEDCOM RSG2100 (32M) V5.X (All versions < V5.10.1), RUGGEDCOM RSG2100P (32M) V5.X (All versions < V5.10.1), RUGGEDCOM RSG2288 V5.X (All versions < V5.10.1), RUGGEDCOM RSG2300 V5.X (All versions < V5.10.1), RUGGEDCOM RSG2300P V5.X (All versions < V5.10.1), RUGGEDCOM RSG2488 V5.X (All versions < V5.10.1), RUGGEDCOM RSG907R (All versions < V5.10.1), RUGGEDCOM RSG908C (All versions < V5.10.1), RUGGEDCOM RSG909R (All versions < V5.10.1), RUGGEDCOM RSG910C (All versions < V5.10.1), RUGGEDCOM RSG920P V5.X (All versions < V5.10.1), RUGGEDCOM RSL910 (All versions < V5.10.1), RUGGEDCOM RST2228 (All versions < V5.10.1), RUGGEDCOM RST2228P (All versions < V5.10.1), RUGGEDCOM RST916C (All versions < V5.10.1), RUGGEDCOM RST916P (All versions < V5.10.1). Affected devices do not properly validate input during the TLS certificate upload process of the web service. This could allow an authenticated remote attacker to trigger a device crash and reboot, leading to a temporary Denial of Service on the device.

Published Dec 9, 2025 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: siemens

Low

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)+2
Technical severity (medium)+3

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

0.25%

ahead of 15% of scored CVEs · Oct 14, 2026

Affects

Siemens

RUGGEDCOM RMC8388 V5.X and 20 more

CVSS base

4.3

Medium · 2 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

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.

Identify exposed assets running the affected vendor/product/version combinations (Siemens RUGGEDCOM RMC8388 V5.X, Siemens RUGGEDCOM RS416Pv2 V5.X, Siemens RUGGEDCOM RS416v2 V5.X…).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes matching the vulnerability class (input validation), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Siemens	RUGGEDCOM RMC8388 V5.X	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RS416Pv2 V5.X	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RS416v2 V5.X	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RS900 (32M) V5.X	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RS900G (32M) V5.X	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RSG2100 (32M) V5.X	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RSG2100P (32M) V5.X	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RSG2288 V5.X	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RSG2300 V5.X	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RSG2300P V5.X	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RSG2488 V5.X	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RSG907R	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RSG908C	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RSG909R	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RSG910C	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RSG920P V5.X	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RSL910	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RST2228	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RST2228P	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RST916C	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Siemens	RUGGEDCOM RST916P	< V5.10.1	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

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

Attack vector

Network

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Every base score collected

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

Score	Version	Severity	Expl.	Impact	Scored by
5.3	CVSS 4.0	Medium	—	—	productcert@siemens.com via NIST National Vulnerability Database
5.3	CVSS 4.0	Medium	—	—	siemens via CVE Program (cve.org) e CISA ADP
4.3	CVSS 3.1	Medium	2.8	1.4	productcert@siemens.com via NIST National Vulnerability Database
4.3	CVSS 3.1	Medium	—	—	siemens via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L (score shown at the top: productcert@siemens.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-20 · Improper Input Validation

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.25%

Detection

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

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).

web/proxy/WAF logsnetwork IDS/IPS

Timeline

What happened to this CVE, newest first.

2026
Affected products added · siemens/ruggedcom rmc8388 v5.x, siemens/ruggedcom rs416pv2 v5.x, siemens/ruggedcom rs416v2 v5.x, siemens/ruggedcom rs900
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
CVSS changed · 4.3
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Deferred
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
2025
CVE published
Dec 9, 2025 · siemens

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

1 on the record

cert-portal.siemens.com/productcert/html/ssa-763474.html
NIST National Vulnerability Database

Elsewhere on this site

Siemens
every CVE for this vendor

Input validation
same class

CWE-20
other pages naming this weakness

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-2025-40935 is "Improper Input Validation in Siemens RUGGEDCOM RMC8388 V5.X", rated Medium. It affects RUGGEDCOM RMC8388 V5.X (Siemens); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 4.3 describes technical severity. EPSS 0.25% 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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