# CVE-2025-70123: Denial of service in n/a

> Remote attackers can cause denial of service in free5GC UPF by sending malformed PFCP requests, disrupting SMF connections and service availability.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Feb 2026
- **Updated:** 13 Feb 2026
- **Also known as:** GHSA-j98c-62jj-x3h3

## What is CVE-2025-70123?

CVE-2025-70123 is a high-severity denial of service vulnerability in Free5gc Free5gc, published on 13 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2025-70123?

It affects 1 product.


Products: Free5gc Free5gc.

## How do I fix CVE-2025-70123?

No fix has been published for CVE-2025-70123 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-70123 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-70123 exists.

## Other vulnerabilities in Free5gc Free5gc

- [CVE-2026-44327](https://insights.sbomify.com/CVE-2026-44327/): free5GC: NEF nnef-oam route group is unauthenticated; no-token requests reach the OAM handler (critical 10.0)
- [CVE-2026-44329](https://insights.sbomify.com/CVE-2026-44329/): free5GC's SMF UPI management interface lacks auth middleware; unauthenticated topology read/write requests reach handlers (critical 10.0)
- [CVE-2026-44330](https://insights.sbomify.com/CVE-2026-44330/): free5GC's NEF nnef-pfdmanagement API is unauthenticated; forged bearer tokens can read PFD data and create/delete PFD subscriptions (critical 10.0)
- [CVE-2025-63679](https://insights.sbomify.com/CVE-2025-63679/): Memory corruption in n/a (critical 9.8)
- [CVE-2026-44315](https://insights.sbomify.com/CVE-2026-44315/): free5GC's NEF 3gpp-pfd-management API is unauthenticated; forged bearer tokens can create, read, and delete PFD transactions (critical 9.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-70123 and fix it if it is affected.

What it is: CVE-2025-70123 is a high-severity denial of service vulnerability in Free5gc Free5gc, published on 13 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-70123 exists.

Affected product: Free5gc Free5gc. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-70123/ (Markdown: https://insights.sbomify.com/CVE-2025-70123/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-70123
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-70123
- OSV: https://osv.dev/vulnerability/CVE-2025-70123

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-70123/
Summaries are generated and may contain mistakes; the official description above is the record.