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CVE-2019-18792

CRITICAL
9.1
CVSS Score
Published: January 6, 2020 at 05:52 PM UTC
Updated: June 17, 2026 at 02:25 AM UTC
2 products affected across 2 vendorsDebian LinuxSuricata

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Severity
CRITICAL9.1
Exploit prediction
EPSS 3%

Description

An issue was discovered in Suricata 5.0.0. It is possible to bypass/evade any tcp based signature by overlapping a TCP segment with a fake FIN packet. The fake FIN packet is injected just before the PUSH ACK packet we want to bypass. The PUSH ACK packet (containing the data) will be ignored by Suricata because it overlaps the FIN packet (the sequence and ack number are identical in the two packets). The client will ignore the fake FIN packet because the ACK flag is not set. Both linux and windows clients are ignoring the injected packet.

Affected

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

Debian Linux· Debiandrupal
95%
8.0
Suricata· Oisf
95%
4.1.5 ≤ v < 4.1.65.0.0
Affected range stops below 4.1.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

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

Patch and advisory references

References (5)

x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://github.com/OISF/suricata/commit/1c63d3905852f746ccde7e2585600b2199cefb4b
x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://github.com/OISF/suricata/commit/fa692df37a796c3330c81988d15ef1a219afc006
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2020/01/msg00032.html
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://redmine.openinfosecfoundation.org/issues/3324
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://redmine.openinfosecfoundation.org/issues/3394

CVSS

9.1CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-436

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