CVE-2025-5520 Open5GS AMF/MME emm_state_authentication assertion
Remote attackers can trigger a reachable assertion in Open5GS AMF/MME components, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-5520?
CVE-2025-5520 is a medium-severity denial of service vulnerability in Open5gs Open5gs, published on 3 Jun 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-617
Which versions are affected by CVE-2025-5520?
It affects 1 product.
Products include Open5gs Open5gs.
How do I fix CVE-2025-5520?
No fix has been published for CVE-2025-5520 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-5520 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-5520 exists.
Other vulnerabilities in Open5gs Open5gs
Sources
Also known as GHSA-mqmr-5x7c-pxxx.