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CVE-2021-37592

Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a client with a crafted TCP/IP...

9.8 CriticalFix available

Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a client with a crafted TCP/IP stack that can send a certain sequence of segments.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

1.60%Up 0.8 points since Nov 20, 2021
90%50%10%1%

What each source reports

NVD Score used 9.8

Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a client with a crafted TCP/IP stack that can send a certain sequence of segments.

Record
CVE-2021-37592
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness
CWE-787
Updated
2026-11-02
CVE List No score

Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a client with a crafted TCP/IP stack that can send a certain sequence of segments.

Record
CVE-2021-37592
Updated
2026-11-02
EUVDEUVD-2021-24150 No score

Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a client with a crafted TCP/IP stack that can send a certain sequence of segments.

Record
EUVD-2021-24150
Updated
2026-11-03
GitHub AdvisoriesGHSA-hxgj-p44f-9x32 9.8

Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a client with a crafted TCP/IP...

Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a client with a crafted TCP/IP stack that can send a certain sequence of segments.

Record
GHSA-hxgj-p44f-9x32
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-787
Updated
2026-11-02
OSVALPINE-CVE-2021-37592 9.8

Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a client with a crafted TCP/IP stack that can send a certain sequence of segments.

Record
ALPINE-CVE-2021-37592
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-03
OSV 9.8

Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a client with a crafted TCP/IP stack that can send a certain sequence of segments.

Record
CVE-2021-37592
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2021-37592 9.8

Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a client with a crafted TCP/IP stack that can send a certain sequence of segments.

Record
DEBIAN-CVE-2021-37592
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-37592 9.8

Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a client with a crafted TCP/IP stack that can send a certain sequence of segments.

Record
UBUNTU-CVE-2021-37592
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
suricata
Alpine:v3.15
 6.0.0 up to 6.0.4-r0
6.0.4-r0
suricata
Alpine:v3.16
 6.0.0 up to 6.0.4-r0
6.0.4-r0
suricata
Alpine:v3.17
 6.0.0 up to 6.0.4-r0
6.0.4-r0
suricata
Alpine:v3.18
 6.0.0 up to 6.0.4-r0
6.0.4-r0
suricata
Alpine:v3.19
 6.0.0 up to 6.0.4-r0
6.0.4-r0
suricata
Alpine:v3.20
 6.0.0 up to 6.0.4-r0
6.0.4-r0
suricata
Alpine:v3.21
 6.0.0 up to 6.0.4-r0
6.0.4-r0
suricata
Alpine:v3.22
 6.0.0 up to 6.0.4-r0
6.0.4-r0
suricata
Alpine:v3.23
 6.0.0 up to 6.0.4-r0
6.0.4-r0
suricata
Alpine:v3.24
 6.0.0 up to 6.0.4-r0
6.0.4-r0
Show 4 moreShow less
Affected packages
PackageAffectedFixed
suricata
Debian:13
 before 1:6.0.4-1
1:6.0.4-1
suricata
Debian:14
 before 1:6.0.4-1
1:6.0.4-1
suricata
Ubuntu:16.04:LTS
 All versions, plus listed versions
2.0.8-1build12.0.9-12.0.10-12.0.10-22.0.11-13.0-1
 None known
suricata
Ubuntu:18.04:LTS
 All versions, plus listed versions
3.2-2ubuntu3
 None known

History

History
RecordedChangedSources
affected, aliases, referencesOSV
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-37592 is a critical vulnerability (CVSS 9.8) in Oisf Suricata, published November 19, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.60%, the 75th percentile. Fixed in suricata 6.0.4-r0.

References

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