DoS via SAML configuration in Guardian/CMC before 22.6.2

Last update: 2023-11-16

Advisory IDNN-2023:7-01
TopicDoS via SAML configuration in Guardian/CMC before 22.6.2
CWE ImpactCWE-20: Improper Input Validation
Issue date2023-08-09
AffectsGuardian, CMC < v22.6.2
CVE Name(s)CVE-2023-23903
CVSS detailsCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CVSS Score4.9
CVE Risk LevelMedium
Risk Level for Nozomi customersMedium


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.

Affected Products

Guardian, CMC < v22.6.2

Workarounds and Mitigations

Use internal firewall features to limit access to the web management interface.


Upgrade to v22.6.2 or later.

Modification History

2023-08-09: Initial revision
2023-09-04: Minor updates to format and metadata to improve the CSAF implementation
2023-11-13: Migrated to CSAF VEX format
2023-11-16: CSAF vers improvements

Related Links


We thank the following parties for their efforts:

  • Stefano Libero of Nozomi Networks Product Security team for finding this issue during a scheduled internal VAPT testing session


Nozomi Networks Product Security team can be reached at prodsec@nozominetworks.com.
More contact details on the PSIRT page.