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Free5gcApplication

CVE-2025-65562

HIGH · 7.5 CVSS v3.1 Published 2025-12-18
No fix yet
No fix has been published. The vendor has not shipped a fixed release or patch. You remain exposed.
See remediation →
84/100
Remediation priority · High
Public exploit Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Free5gcApplication
Affected:= 4.1.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Recommended fix Moderate confidence

Latest free5GC release after v4.1.0 (check GitHub releases for v4.1.1 or later)

  1. 1. Obtain the latest stable release of free5GC from the official GitHub repository (github.com/free5gc/free5gc)
  2. 2. Review the release notes and changelog for CVE-2025-65562 to confirm the fix is included
  3. 3. Backup the current free5GC configuration and database
  4. 4. Stop the free5GC services
  5. 5. Replace the UPF binary/component with the updated version containing the bounds checking fix
  6. 6. Verify that the fix in internal/pfcp/node.go includes proper validation of SEID before index arithmetic (e.g., check that SEID is within valid range before conversion from uint64 to int)
  7. 7. Restart the free5GC services
  8. 8. Test PFCP Session Deletion Request handling with edge case SEID values to confirm the vulnerability is mitigated
Caveat Minor version upgrades in free5GC typically maintain backward compatibility for 3GPP interfaces, but review release notes for any schema or configuration changes

Generated from the published advisory — verify against the referenced sources before acting.

No vendor fix exists Free5gc has not published a patch for this.

There is no version to upgrade to and no patch to apply. Every affected install stays exposed until the vendor ships a fix — or somebody else builds one.

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Free · runs locally
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-65562 in production — separate from our analysis above.

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