CVE-2021-20201

Name: CVE-2021-20201
Creator: NVD / NIST
Published: 2021-05-28T11:15:07.9+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 2.70%

Last modified Jun 17, 2026

CVE-2021-20201 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. A flaw was found in spice in versions before 0.14.92. A DoS tool might make it easier for remote attackers to cause a denial of service (CPU consumption) by performing many renegotiations within a single connection.. EPSS estimates a 2.70% chance of exploitation in the next 30 days.

Description

A flaw was found in spice in versions before 0.14.92. A DoS tool might make it easier for remote attackers to cause a denial of service (CPU consumption) by performing many renegotiations within a single connection.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

2.70%

84.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Spice Project	Spice	< 0.14.92
Redhat	Enterprise Linux	6.0
Redhat	Enterprise Linux	7.0
Redhat	Enterprise Linux	8.0

References

https://blog.qualys.com/product-tech/2011/10/31/tls-renegotiation-and-denial-of-service-attacksExploit, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1921846Issue Tracking, Third Party Advisory
https://security.gentoo.org/glsa/202208-10Third Party Advisory
https://blog.qualys.com/product-tech/2011/10/31/tls-renegotiation-and-denial-of-service-attacksExploit, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1921846Issue Tracking, Third Party Advisory
https://security.gentoo.org/glsa/202208-10Third Party Advisory

Timeline

Published: May 28, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20201?

How severe is CVE-2021-20201?

CVE-2021-20201 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 2.70% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20201?

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-2021-20201?

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

Scan your code now

Source: NVD / NIST