CVE-2025-5520: Open5GS AMF/MME emm_state_authentication assertion

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-06-03 · updated 2026-06-17
Weakness: CWE-617

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.

Affected products

Open5GS: from 2.7.0 through 2.7.3

References

https://github.com/open5gs/open5gs/commit/9f5d133657850e6167231527514ee1364d37a884
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://vuldb.com/?ctiid.310956
https://vuldb.com/?id.310956
https://vuldb.com/?submit.582269
https://github.com/open5gs/open5gs/issues/3910

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