CVE-2019-18625

Name: CVE-2019-18625
Creator: NVD / NIST
Published: 2020-01-06T21:15:11.427+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.71%

Last modified Jun 17, 2026

CVE-2019-18625 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 1.71% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

1.71%

74.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Oisf	Suricata	5.0.0
Debian	Debian Linux	8.0

References

https://github.com/OISF/suricata/commit/9f0294fadca3dcc18c919424242a41e01f3e8318Patch, Third Party Advisory
https://github.com/OISF/suricata/commit/ea0659de7640cf6a51de5bbd1dbbb0414e4623a0Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/01/msg00032.htmlMailing List, Third Party Advisory
https://redmine.openinfosecfoundation.org/issues/3286Third Party Advisory
https://redmine.openinfosecfoundation.org/issues/3395Third Party Advisory
https://github.com/OISF/suricata/commit/9f0294fadca3dcc18c919424242a41e01f3e8318Patch, Third Party Advisory
https://github.com/OISF/suricata/commit/ea0659de7640cf6a51de5bbd1dbbb0414e4623a0Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/01/msg00032.htmlMailing List, Third Party Advisory
https://redmine.openinfosecfoundation.org/issues/3286Third Party Advisory
https://redmine.openinfosecfoundation.org/issues/3395Third Party Advisory

Timeline

Published: Jan 6, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-18625?

How severe is CVE-2019-18625?

CVE-2019-18625 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.71% probability of exploitation in the next 30 days.

How do I fix CVE-2019-18625?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-18625?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST