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Full vulnerability report · 2023
CVE-2023-43503High confidence

A vulnerability has been identified in COMOS (All versions < V10.4.4)

Siemens · COMOS

Official source article: Siemens SSA-137900 ↗. Check the applicable product and release in the original source.

3.5LowCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

Low technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityLowOperational priority:Low, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 0.31% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Siemens COMOS and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: No default targetRemediation target: Normal maintenance

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
SSA-137900 · CSAF 2.0 · revision 1 · finalSiemens ProductCERTSSA-137900: Multiple Vulnerabilities in COMOS
1 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • COMOS
Summary
Caching system in the affected application leaks sensitive information such as user and project information in cleartext via UDP.
Remediation
For CVE-2023-43503, update to V10.4.4 or later version and update the COMOS database to version 25. (See “Data maintenance: Modifying the version” in the user manual. Warning: After the update, the database cannot be used by older COMOS versions)
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2023-47909

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

Low technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

A vulnerability has been identified in COMOS (All versions < V10.4.4). Caching system in the affected application leaks sensitive information such as user and project information in cleartext via UDP.

What

A vulnerability has been identified in COMOS (All versions < V10.4.4). Caching system in the affected application leaks sensitive information such as user and project information in cleartext via UDP.

Why

The product transmits sensitive or security-critical data in cleartext in a communication channel that can be sniffed by unauthorized actors.

How

An attacker operating through an adjacent network may attempt exploitation with low privileges. If successful, the issue may obtain information outside the intended access boundary.

What

A vulnerability has been identified in COMOS (All versions < V10.4.4). Caching system in the affected application leaks sensitive information such as user and project information in cleartext via UDP.

Why

The product transmits sensitive or security-critical data in cleartext in a communication channel that can be sniffed by unauthorized actors.

How

An attacker operating through an adjacent network may attempt exploitation with low privileges. If successful, the issue may obtain information outside the intended access boundary.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
an adjacent network → Cleartext Transmission of Sensitive Information → obtain information outside the intended access boundary
Attack surface
Adjacent
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-319 ↗

CWE-319: Cleartext Transmission of Sensitive Information. The product transmits sensitive or security-critical data in cleartext in a communication channel that can be sniffed by unauthorized actors.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVAdjacentAttack vector: The attacker must be on an adjacent or logically close network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CLowConfidentiality impact: A successful attack can cause a limited loss.INoneIntegrity impact: No direct loss is represented by this metric.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
CWE-319
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

Cyber Security Agency of Singapore · English · CSA-SB-20231115Security Bulletin 15 Nov 2023

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 15 Nov 2023, published on 15 November 2023. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2023-AVI-0935Multiples vulnérabilités dans les produits Siemens

ecord?id=CVE-2023-38072 Référence CVE CVE-2023-38073 https://www.cve.org/CVERecord?id=CVE-2023-38073 Référence CVE CVE-2023-38074 https://www.cve.org/CVERecord?id=CVE-2023-38074 Référence CVE CVE-2023-38075 https://www.cve.org/CVERecord?id=CVE-2023-38075 Référence CVE CVE-2023-38076 https://www.cve.org/CVERecord?id=CVE-2023-38076 Référence CVE CVE-2023-3817 https://www.cve.org/CVERecord?id=CVE-2023-3817 Référence CVE CVE-2023-3935 https://www.cve.org/CVERecord?id=CVE-2023-3935 Référence CVE CVE-2023-41032 https://www.cve.org/CVERecord?id=CVE-2023-41032 Référence CVE CVE-2023-41033 https://www.cve.org/CVERecord?id=CVE-2023-41033 Référence CVE CVE-2023-43503 https://www.cve.org/CVERecord?id=CVE-2023-43503 Référence CVE CVE-2023-43504 https://www.cve.org/CVERecord?id=CVE-2023-43504 Référence CVE CVE-2023-43505 https://www.cve.org/CVERecord?id=CVE-2023-43505 Référence CVE CVE-2023-44317 https://www.cve.org/CVERecord?id=CVE-2023-44317 Référence CVE CVE-2023-44318 https://www.cve.org/CVERecord?id=CVE-2023-44318 Référence CVE CVE-2023-44319 https://www.cve.org/CVERecord?id=CVE-2023-44319 Référence CVE CVE-2023-44320 https://www.cve.org/CVERecord?id=CVE-2023-44320 Référence CVE CVE-2023-44321 https://www.cve.org/CVERecord?id=CVE-2023-44321 Référence CVE CVE-2023-44322 https://www.cve.org/CVERecord?id=

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2023-017419シーメンスの COMOS における重要な情報の平文での送信に関する脆弱性

シーメンスの COMOS には、重要な情報の平文での送信に関する脆弱性が存在します。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix availability varies by product
Affected
COMOS
Fixed
For CVE-2023-43503, update to V10.4.4 or later version and update the COMOS database to version 25. (See “Data maintenance: Modifying the version” in the user manual. Warning: After the update, the database cannot be used by older COMOS versions)
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 14 Nov 2023 · Last source change 8 Jan 2025, 16:41 UTC · CWE-319 · Cleartext Transmission of Sensitive Information

CVE recordCVE.org · 5.1
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2023-47909
Product sourceVendor CSAF · Siemens ProductCERT
Remediation sourceVendor CSAF · Siemens ProductCERT
CWE sourceCNA
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    All versions < V10.4.4 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    All versions < V10.4.4 · Fixed: For CVE-2023-43503, update to V10.4.4 or later version and update the COMOS database to version 25. (See “Data maintenance: Modifying the version” in the user manual. Warning: After the update, the database cannot be used by older COMOS versions)
    Siemens ProductCERT ↗
  2. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    Siemens ProductCERT ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2023-47909↗Siemens ProductCERT security advisory · Siemens SSA-137900↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2023-43503 · cve.blacktree.nl