How severe is CVE-2025-70123?

CVE-2025-70123 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-2025-70123 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-70123?

CVE-2025-70123 affects Free5gc. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-70123?

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-2025-70123 have an EU (EUVD) identifier?

Yes. CVE-2025-70123 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-207535.

When was CVE-2025-70123 published?

CVE-2025-70123 was published on 2026-02-13 and last updated on 2026-06-17.

CVE-2025-70123

CVE-2025-70123 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-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-207535
Weakness: CWE-20
Affected product: Free5gc
Published: 2026-02-13
Last modified: 2026-06-17

Description

An improper input validation and protocol compliance vulnerability in free5GC v4.0.1 allows remote attackers to cause a denial of service. The UPF incorrectly accepts a malformed PFCP Association Setup Request, violating 3GPP TS 29.244. This places the UPF in an inconsistent state where a subsequent valid PFCP Session Establishment Request triggers a cascading failure, disrupting the SMF connection and causing service degradation.

Frequently asked questions

What is CVE-2025-70123?: An improper input validation and protocol compliance vulnerability in free5GC v4.0.1 allows remote attackers to cause a denial of service. The UPF incorrectly accepts a malformed PFCP Association Setup Request, violating 3GPP TS 29.244. This places the UPF in an inconsistent state where a subsequent valid PFCP Session Establishment Request triggers a cascading failure, disrupting the SMF connection and causing service degradation.
How severe is CVE-2025-70123?: CVE-2025-70123 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-2025-70123 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-70123?: CVE-2025-70123 affects Free5gc. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-70123?: 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-2025-70123 have an EU (EUVD) identifier?: Yes. CVE-2025-70123 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-207535.
When was CVE-2025-70123 published?: CVE-2025-70123 was published on 2026-02-13 and last updated on 2026-06-17.

References

https://github.com/free5gc/free5gc/issues/745

Affected products (1)

cpe:2.3:a:free5gc:free5gc:4.0.1:*:*:*:*:*:*:*

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