Description

A vulnerability was found in Open5GS up to 2.7.3. It has been classified as problematic. Affected is the function gmm_state_authentication/emm_state_authentication of the component AMF/MME. The manipulation leads to reachable assertion. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The name of the patch is 9f5d133657850e6167231527514ee1364d37a884. It is recommended to apply a patch to fix this issue. This is a different issue than CVE-2025-1893. Es wurde eine problematische Schwachstelle in Open5GS bis 2.7.3 ausgemacht. Hiervon betroffen ist die Funktion gmm_state_authentication/emm_state_authentication der Komponente AMF/MME. Durch Manipulieren mit unbekannten Daten kann eine reachable assertion-Schwachstelle ausgenutzt werden. Der Angriff kann über das Netzwerk angegangen werden. Der Exploit steht zur öffentlichen Verfügung. Der Patch wird als 9f5d133657850e6167231527514ee1364d37a884 bezeichnet. Als bestmögliche Massnahme wird Patching empfohlen.

Classification

CVE ID: CVE-2025-5520

CVSS Base Severity: MEDIUM

CVSS Base Score: 5.3

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected Products

Vendor: n/a

Product: Open5GS

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.09% (probability of being exploited)

EPSS Percentile: 27.73% (scored less or equal to compared to others)

EPSS Date: 2025-06-07 (when was this score calculated)

Stakeholder-Specific Vulnerability Categorization (SSVC)

SSVC Exploitation: poc

SSVC Technical Impact: partial

SSVC Automatable: true

References

https://nvd.nist.gov/vuln/detail/CVE-2025-5520
https://vuldb.com/?id.310956
https://vuldb.com/?ctiid.310956
https://vuldb.com/?submit.582269
https://github.com/open5gs/open5gs/issues/3910
https://github.com/open5gs/open5gs/issues/3910#issuecomment-2926719317
https://github.com/user-attachments/files/20362243/Problematic.handover.required.process.zip
https://github.com/open5gs/open5gs/commit/9f5d133657850e6167231527514ee1364d37a884

Timeline