How severe is CVE-2025-65566?

CVE-2025-65566 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-2025-65566 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-65566?

CVE-2025-65566 affects Linuxfoundation Upf. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-65566?

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-2025-65566 have an EU (EUVD) identifier?

Yes. CVE-2025-65566 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204335.

When was CVE-2025-65566 published?

CVE-2025-65566 was published on 2025-12-18 and last updated on 2026-06-17.

CVE-2025-65566

CVE-2025-65566 is a high-severity vulnerability in Linuxfoundation Upf 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-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-204335
Weakness: CWE-476
Affected product: Linuxfoundation Upf
Published: 2025-12-18
Last modified: 2026-06-17

Description

A denial-of-service vulnerability exists in the omec-project UPF (pfcpiface component) in version upf-epc-pfcpiface:2.1.3-dev. When the UPF receives a PFCP Session Report Response that is missing the mandatory Cause Information Element, the session report handler dereferences a nil pointer instead of rejecting the malformed message. This triggers a panic and terminates the UPF process. An attacker who can send PFCP Session Report Response messages to the UPF's N4/PFCP endpoint can exploit this flaw to repeatedly crash the UPF and disrupt user-plane services.

Frequently asked questions

What is CVE-2025-65566?: A denial-of-service vulnerability exists in the omec-project UPF (pfcpiface component) in version upf-epc-pfcpiface:2.1.3-dev. When the UPF receives a PFCP Session Report Response that is missing the mandatory Cause Information Element, the session report handler dereferences a nil pointer instead of rejecting the malformed message. This triggers a panic and terminates the UPF process. An attacker who can send PFCP Session Report Response messages to the UPF's N4/PFCP endpoint can exploit this flaw to repeatedly crash the UPF and disrupt user-plane services.
How severe is CVE-2025-65566?: CVE-2025-65566 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-2025-65566 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-65566?: CVE-2025-65566 affects Linuxfoundation Upf. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-65566?: 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-2025-65566 have an EU (EUVD) identifier?: Yes. CVE-2025-65566 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204335.
When was CVE-2025-65566 published?: CVE-2025-65566 was published on 2025-12-18 and last updated on 2026-06-17.

References

https://github.com/omec-project/upf/issues/958

Affected products (1)

cpe:2.3:a:linuxfoundation:upf:2.1.3:dev:*:*:*:*:*:*

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