CVE-2021-3655

Name: CVE-2021-3655
Creator: NVD / NIST
Published: 2021-08-05T21:15:13.707+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.3/10EPSS 0.31%

Last modified Jun 17, 2026

CVE-2021-3655 is a low-severity vulnerability rated 3.3/10 on the CVSS scale. A vulnerability was found in the Linux kernel in versions prior to v5.14-rc1. Missing size validations on inbound SCTP packets may allow the kernel to read uninitialized memory.. EPSS estimates a 0.31% chance of exploitation in the next 30 days.

Description

A vulnerability was found in the Linux kernel in versions prior to v5.14-rc1. Missing size validations on inbound SCTP packets may allow the kernel to read uninitialized memory.

Metrics

CVSS 3.1

3.3/10

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

EPSS Probability

0.31%

22.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	< 5.14
Linux	Linux Kernel	5.14
Redhat	Enterprise Linux	8.0
Debian	Debian Linux	9.0

References

https://bugzilla.redhat.com/show_bug.cgi?id=1984024Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.htmlMailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1984024Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.htmlMailing List, Third Party Advisory

Timeline

Published: Aug 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3655?

A vulnerability was found in the Linux kernel in versions prior to v5.14-rc1. Missing size validations on inbound SCTP packets may allow the kernel to read uninitialized memory.

How severe is CVE-2021-3655?

CVE-2021-3655 has a CVSS score of 3.3/10 (LOW severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3655?

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-2021-3655?

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

Scan your code now

Source: NVD / NIST