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

What is CVE-2019-18625?

CVE-2019-18625 is a high-severity vulnerability in Debian Debian Linux, published on 6 Jan 2020.

Official 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.

Which versions are affected by CVE-2019-18625?

It affects 2 products.

Products include Debian Debian Linux, Oisf Suricata.

How do I fix CVE-2019-18625?

Upgrade to a fixed version.

Is CVE-2019-18625 being exploited?

There is no known exploitation of CVE-2019-18625 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2019-18625, GHSA-h726-j7j2-xhpf, UBUNTU-CVE-2019-18625.