CVE-2019-18625

HIGH
7.5
CVSS Score
Published: January 6, 2020 at 08:09 PM UTC
Updated: June 17, 2026 at 02:25 AM UTC
2 products affected across 2 vendorsDebian LinuxSuricata· also runs on 2 platforms

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Severity
HIGH7.5
Exploit prediction
EPSS 2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

linux-linux-kernel (environment) · microsoft-windows (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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