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Full vulnerability report · 2023
CVE-2023-23903High confidence

DoS via SAML configuration in Guardian/CMC before 22.6.2

Nozomi Networks · Guardian

6.9MediumCVSS 4.0
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
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.

2 current
NN-2023:7-01 · CSAF 2.0 · revision 6 · finalNozomi NetworksDoS via SAML configuration in Guardian/CMC before 22.6.2
2 known affected

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

  • Nozomi Networks Guardian <22.6.2
  • Nozomi Networks CMC <22.6.2
Summary
An authenticated administrator can upload a SAML configuration file with the wrong format, with the application not checking the correct file format. Every subsequent application request will return an error.
Remediation
Upgrade to v22.6.2 or later.
SSA-647455 · CSAF 2.0 · revision 3 · finalSiemens ProductCERTSSA-647455: Multiple Vulnerabilities in Nozomi Guardian/CMC before 22.6.2 on RUGGEDCOM APE1808 devices
1 known affected

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

  • RUGGEDCOM APE1808
Summary
An authenticated administrator can upload a SAML configuration file with the wrong format, with the application not checking the correct file format. Every subsequent application request will return an error. The whole application in rendered unusable until a console intervention.
Remediation
Upgrade Nozomi Guardian / CMC to V23.4.1. Contact customer support to receive patch and update information.
Optional official sources

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

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

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-2023-27986

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 actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

An authenticated administrator can upload a SAML configuration file with the wrong format, with the application not checking the correct file format. Every subsequent application request will return an error. The whole application in rendered unusable until a console intervention.

What

An authenticated administrator can upload a SAML configuration file with the wrong format, with the application not checking the correct file format. Every subsequent application request will return an error. The whole application in rendered unusable until a console intervention.

Why

The product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax.

How

An attacker operating through a network path may attempt exploitation with elevated privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

An authenticated administrator can upload a SAML configuration file with the wrong format, with the application not checking the correct file format. Every subsequent application request will return an error. The whole application in rendered unusable until a console intervention.

Why

The product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax.

How

An attacker operating through a network path may attempt exploitation with elevated privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

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
a network path → Improper Validation of Syntactic Correctness of Input → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
High: elevated access is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Not a CVSS 4.0 base metric
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-1286 ↗

CWE-1286: Improper Validation of Syntactic Correctness of Input. The product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Common Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATNoneAttack requirements: No additional deployment or execution condition is required.PRHighPrivileges required: The attacker needs elevated or administrative privileges.UINoneUser interaction: No action by another user is required.VCNoneVulnerable-system confidentiality: No direct loss is represented by this metric.VINoneVulnerable-system integrity: No direct loss is represented by this metric.VAHighVulnerable-system availability: A successful attack can cause a major loss.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.SANoneSubsequent-system availability: 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.
NetworkCWE-1286
A

Official authority intelligence

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

CERT-FR · French · CERTFR-2023-AVI-0819Multiples vulnérabilités dans les produits Siemens

d?id=CVE-2023-22785 Référence CVE CVE-2023-22786 https://www.cve.org/CVERecord?id=CVE-2023-22786 Référence CVE CVE-2023-22787 https://www.cve.org/CVERecord?id=CVE-2023-22787 Référence CVE CVE-2023-22788 https://www.cve.org/CVERecord?id=CVE-2023-22788 Référence CVE CVE-2023-22789 https://www.cve.org/CVERecord?id=CVE-2023-22789 Référence CVE CVE-2023-22790 https://www.cve.org/CVERecord?id=CVE-2023-22790 Référence CVE CVE-2023-22791 https://www.cve.org/CVERecord?id=CVE-2023-22791 Référence CVE CVE-2023-22843 https://www.cve.org/CVERecord?id=CVE-2023-22843 Référence CVE CVE-2023-23574 https://www.cve.org/CVERecord?id=CVE-2023-23574 Référence CVE CVE-2023-23903 https://www.cve.org/CVERecord?id=CVE-2023-23903 Référence CVE CVE-2023-24015 https://www.cve.org/CVERecord?id=CVE-2023-24015 Référence CVE CVE-2023-24471 https://www.cve.org/CVERecord?id=CVE-2023-24471 Référence CVE CVE-2023-24477 https://www.cve.org/CVERecord?id=CVE-2023-24477 Référence CVE CVE-2023-30900 https://www.cve.org/CVERecord?id=CVE-2023-30900 Référence CVE CVE-2023-35796 https://www.cve.org/CVERecord?id=CVE-2023-35796 Référence CVE CVE-2023-36380 https://www.cve.org/CVERecord?id=CVE-2023-36380 Référence CVE CVE-2023-37194 https://www.cve.org/CVERecord?id=CVE-2023-37194 Référence CVE CVE-2023-37195 https://www.cve.org/CVERecord?id=

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.
Patch available
Affected
Nozomi Networks Guardian <22.6.2; Nozomi Networks CMC <22.6.2
Fixed
Nozomi Networks Guardian 22.6.2; Nozomi Networks CMC 22.6.2
Action
Upgrade to v22.6.2 or later.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 9 Aug 2023 · Last source change 20 Sept 2024, 12:09 UTC · CWE-1286 · Improper Validation of Syntactic Correctness of Input

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-2023-27986
Product sourceVendor CSAF · Nozomi Networks
Remediation sourceVendor CSAF · Nozomi Networks
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. Vendor guidanceAuthoritative vendor guidance changed from authoritative remediation link to authoritative remediation link.
    Before
    authoritative remediation link
    After
    authoritative remediation link
    Nozomi Networks ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2023-27986↗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-2023-23903 · cve.blacktree.nl