CVE-2025-5520: open5gs — Exploit & Fix

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.

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CVSS v3.1 Score

5.3

MEDIUM

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

Weakness Type (CWE)

CWE-617 CWE-617

Affected Products

Vendor	Product	Versions
open5gs	open5gs	2.7.0 — 2.7.3

References

Advisories & Patches

https://github.com/open5gs/open5gs/commit/9f5d133657850e6167231527514ee1364d37a884

Exploits

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/issues/3910

Other References

https://vuldb.com/?ctiid.310956 https://vuldb.com/?id.310956 https://vuldb.com/?submit.582269

Frequently Asked Questions

What is CVE-2025-5520? +

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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-5520? +

CVE-2025-5520 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-5520? +

CVE-2025-5520 affects products from open5gs, specifically: open5gs. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-5520? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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