How severe is CVE-2025-65562?

CVE-2025-65562 has a CVSS 3.x base score of 7.5, rated high 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 high.

Is CVE-2025-65562 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-65562?

CVE-2025-65562 affects Free5gc. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-65562?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-65562 have an EU (EUVD) identifier?

Yes. CVE-2025-65562 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204374.

When was CVE-2025-65562 published?

CVE-2025-65562 was published on 2025-12-18 and last updated on 2026-06-17.

CVE-2025-65562

CVE-2025-65562 is a high-severity vulnerability in Free5gc with a CVSS 3.x base score of 7.5. 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-129.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-204374
Weakness: CWE-129
Affected product: Free5gc
Published: 2025-12-18
Last modified: 2026-06-17

Description

The free5GC UPF suffers from a lack of bounds checking on the SEID when processing PFCP Session Deletion Requests. An unauthenticated remote attacker can send a request with a very large SEID (e.g., 0xFFFFFFFFFFFFFFFF) that causes an integer conversion/underflow in LocalNode.DeleteSess() / LocalNode.Sess() when a uint64 SEID is converted to int and used in index arithmetic. This leads to a negative index into n.sess and a Go runtime panic, resulting in a denial of service (UPF crash). The issue has been reproduced on free5GC v4.1.0 with crashes observed in the session lookup/deletion path in internal/pfcp/node.go; other versions may also be affected. No authentication is required.

Frequently asked questions

What is CVE-2025-65562?: The free5GC UPF suffers from a lack of bounds checking on the SEID when processing PFCP Session Deletion Requests. An unauthenticated remote attacker can send a request with a very large SEID (e.g., 0xFFFFFFFFFFFFFFFF) that causes an integer conversion/underflow in LocalNode.DeleteSess() / LocalNode.Sess() when a uint64 SEID is converted to int and used in index arithmetic. This leads to a negative index into n.sess and a Go runtime panic, resulting in a denial of service (UPF crash). The issue has been reproduced on free5GC v4.1.0 with crashes observed in the session lookup/deletion path in internal/pfcp/node.go; other versions may also be affected. No authentication is required.
How severe is CVE-2025-65562?: CVE-2025-65562 has a CVSS 3.x base score of 7.5, rated high 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 high.
Is CVE-2025-65562 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-65562?: CVE-2025-65562 affects Free5gc. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-65562?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-65562 have an EU (EUVD) identifier?: Yes. CVE-2025-65562 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204374.
When was CVE-2025-65562 published?: CVE-2025-65562 was published on 2025-12-18 and last updated on 2026-06-17.

References

https://github.com/free5gc/free5gc/issues/731

Affected products (1)

cpe:2.3:a:free5gc:free5gc:4.1.0:*:*:*:*:*:*:*

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