How severe is CVE-2025-5520?

CVE-2025-5520 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2025-5520 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-5520?

CVE-2025-5520 affects Open5gs. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-5520?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-5520 have an EU (EUVD) identifier?

Yes. CVE-2025-5520 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16763.

When was CVE-2025-5520 published?

CVE-2025-5520 was published on 2025-06-03 and last updated on 2026-06-17.

CVE-2025-5520

CVE-2025-5520 is a medium-severity vulnerability in Open5gs with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-617.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
CVSS v4: 6.9
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-16763
Weakness: CWE-617
Affected product: Open5gs
Published: 2025-06-03
Last modified: 2026-06-17

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.

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.
How severe is CVE-2025-5520?: CVE-2025-5520 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2025-5520 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-5520?: CVE-2025-5520 affects Open5gs. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-5520?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-5520 have an EU (EUVD) identifier?: Yes. CVE-2025-5520 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16763.
When was CVE-2025-5520 published?: CVE-2025-5520 was published on 2025-06-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:open5gs:open5gs:*:*:*:*:*:*:*:*

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