CVE-2021-35063

Name: CVE-2021-35063
Creator: NVD / NIST
Published: 2021-07-22T18:15:23.21+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.97%

Last modified Jun 17, 2026

CVE-2021-35063 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Suricata before 5.0.7 and 6.x before 6.0.3 has a "critical evasion.". EPSS estimates a 1.97% chance of exploitation in the next 30 days.

Description

Suricata before 5.0.7 and 6.x before 6.0.3 has a "critical evasion."

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.97%

77.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Oisf	Suricata	< 5.0.7
Oisf	Suricata	>= 6.0.0, < 6.0.3
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Fedoraproject	Fedora	34
Fedoraproject	Fedora	35

References

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=990835Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1980453Issue Tracking, Third Party Advisory
https://forum.suricata.io/t/suricata-6-0-3-and-5-0-7-released/1489Release Notes, Vendor Advisory
https://github.com/OISF/suricata/releasesThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JU27J2ZYG6FBDL5CERE6FBB4ZFGHOROE/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XEP7PWY4LRT2R4MFLV7JIJRYZEZ7RQFL/
https://security-tracker.debian.org/tracker/CVE-2021-35063Third Party Advisory
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=990835Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1980453Issue Tracking, Third Party Advisory
https://forum.suricata.io/t/suricata-6-0-3-and-5-0-7-released/1489Release Notes, Vendor Advisory
https://github.com/OISF/suricata/releasesThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JU27J2ZYG6FBDL5CERE6FBB4ZFGHOROE/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XEP7PWY4LRT2R4MFLV7JIJRYZEZ7RQFL/
https://security-tracker.debian.org/tracker/CVE-2021-35063Third Party Advisory

Timeline

Published: Jul 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-35063?

Suricata before 5.0.7 and 6.x before 6.0.3 has a "critical evasion."

How severe is CVE-2021-35063?

CVE-2021-35063 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.97% probability of exploitation in the next 30 days.

How do I fix CVE-2021-35063?

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-2021-35063?

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

Scan your code now

Source: NVD / NIST