CVE-2023-31238 — A vulnerability has been identified in POWER METER SICAM Q200 family (All versions < V2.70)....
A vulnerability has been identified in SICAM P850 (7KG8500-0AA00-0AA0) (All versions < V3.11), SICAM P850 (7KG8500-0AA00-2AA0) (All versions < V3.11), SICAM P850 (7KG8500-0AA10-0AA0) (All versions < V3.11), SICAM P850 (7KG8500-0AA10-2AA0) (All versions < V3.11), SICAM P850 (7KG8500-0AA30-0AA0) (All versions < V3.11), SICAM P850 (7KG8500-0AA30-2AA0) (All versions < V3.11), SICAM P850 (7KG8501-0AA01-0AA0) (All versions < V3.11), SICAM P850 (7KG8501-0AA01-2AA0) (All versions < V3.11), SICAM P850 (7KG8501-0AA02-0AA0) (All versions < V3.11), SICAM P850 (7KG8501-0AA02-2AA0) (All versions < V3.11), SICAM P850 (7KG8501-0AA11-0AA0) (All versions < V3.11), SICAM P850 (7KG8501-0AA11-2AA0) (All versions < V3.11), SICAM P850 (7KG8501-0AA12-0AA0) (All versions < V3.11), SICAM P850 (7KG8501-0AA12-2AA0) (All versions < V3.11), SICAM P850 (7KG8501-0AA31-0AA0) (All versions < V3.11), SICAM P850 (7KG8501-0AA31-2AA0) (All versions < V3.11), SICAM P850 (7KG8501-0AA32-0AA0) (All versions < V3.11), SICAM P850 (7KG8501-0AA32-2AA0) (All versions < V3.11), SICAM P855 (7KG8550-0AA00-0AA0) (All versions < V3.11), SICAM P855 (7KG8550-0AA00-2AA0) (All versions < V3.11), SICAM P855 (7KG8550-0AA10-0AA0) (All versions < V3.11), SICAM P855 (7KG8550-0AA10-2AA0) (All versions < V3.11), SICAM P855 (7KG8550-0AA30-0AA0) (All versions < V3.11), SICAM P855 (7KG8550-0AA30-2AA0) (All versions < V3.11), SICAM P855 (7KG8551-0AA01-0AA0) (All versions < V3.11), SICAM P855 (7KG8551-0AA01-2AA0) (All versions < V3.11), SICAM P855 (7KG8551-0AA02-0AA0) (All versions < V3.11), SICAM P855 (7KG8551-0AA02-2AA0) (All versions < V3.11), SICAM P855 (7KG8551-0AA11-0AA0) (All versions < V3.11), SICAM P855 (7KG8551-0AA11-2AA0) (All versions < V3.11), SICAM P855 (7KG8551-0AA12-0AA0) (All versions < V3.11), SICAM P855 (7KG8551-0AA12-2AA0) (All versions < V3.11), SICAM P855 (7KG8551-0AA31-0AA0) (All versions < V3.11), SICAM P855 (7KG8551-0AA31-2AA0) (All versions < V3.11), SICAM P855 (7KG8551-0AA32-0AA0) (All versions < V3.11), SICAM P855 (7KG8551-0AA32-2AA0) (All versions < V3.11), SICAM T (All versions < V3.0). Affected devices are missing cookie protection flags when using the default settings. An attacker who gains access to a session token can use it to impersonate a legitimate application user.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- EPSS 0.4% (30-day exploitation probability)+6
- 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.
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.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
- Documented patch — cert-portal.siemens.com (NIST National Vulnerability Database)
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 Q200 Firmware, Siemens SICAM P850, Siemens SICAM P855…).
- The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
- Apply the fixed version or the patch documented under Remediation.
- Search available logs for exploit probes matching the vulnerability class (access control), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Siemens | Q200 Firmware | < 2.70 | Vulnerable | NIST National Vulnerability Database |
| Siemens | SICAM P850 | < V3.11 | Vulnerable | CVE Program (cve.org) e CISA ADP |
| Siemens | SICAM P855 | < V3.11 | Vulnerable | CVE Program (cve.org) e CISA ADP |
| Siemens | SICAM T | < V3.0 | Vulnerable | CVE Program (cve.org) e CISA ADP |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
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 |
|---|---|---|---|---|---|
| 5.5 | CVSS 3.1 | Medium | 1.3 | 3.7 | productcert@siemens.com via NIST National Vulnerability Database |
| 5.5 | CVSS 3.1 | Medium | — | — | GitHub, Inc. via GitHub Security Advisories |
| 5.5 | CVSS 3.1 | Medium | — | — | siemens via CVE Program (cve.org) e CISA ADP |
| 4.8 | CVSS 3.1 | Medium | 2.2 | 2.5 | nvd@nist.gov via NIST National Vulnerability Database |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N (score shown at the top: nvd@nist.gov) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
CWE-732 · Incorrect Permission Assignment for Critical Resource
EPSS over time FIRST
Oct 23, 2026 → Oct 25, 2026 · 3 reading(s) · max 0.43%
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).
- Audit administrative actions and access to resources outside each user’s normal pattern.
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · siemens/sicam p850, siemens/sicam p855, siemens/sicam t
- SSVC assessment updated
- Record published
- Fix documented
- Affected products added · siemens/q200 firmware
- CVSS changed · 4.8
- Source status changed · → Modified
- Record created in this database
- 2023
- CVE published
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
8 on the record
- cert-portal.siemens.com/productcert/pdf/ssa-887249.pdf
- cert-portal.siemens.com/productcert/html/ssa-480095.html
- cert-portal.siemens.com/productcert/html/ssa-887249.html
- cert-portal.siemens.com/productcert/html/ssa-201498.html
- github.com/advisories/GHSA-3gq4-h9hg-9898
- cert-portal.siemens.com/productcert/pdf/ssa-480095.pdf
- cert-portal.siemens.com/productcert/html/ssa-471761.html
- nvd.nist.gov/vuln/detail/CVE-2023-31238
Elsewhere on this site
Related CVEs (same products)
- High CVE-2023-30901 A vulnerability has been identified in POWER METER SICAM Q200 family (All versions < V2.70). The... Jun 13, 2023
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 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-2023-31238 is "A vulnerability has been identified in POWER METER SICAM Q200 family (All versions < V2.70)....", rated Medium. It affects Q200 Firmware (Siemens); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 4.8 describes technical severity. EPSS 0.43% 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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