What’s Vulnerable › Vulnerabilities

CVE-2021-20201

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-28 · updated 2026-06-17
• Weakness: CWE-400

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.

Affected products

• Red Hat Enterprise Linux: 6.0, 7.0, 8.0
• The SPICE Project spice: before 0.14.92 — fixed in 0.14.92

How to fix

Upgrade to a fixed version: The SPICE Project spice 0.14.92. Check the vendor advisory for mitigations.

References

• https://blog.qualys.com/product-tech/2011/10/31/tls-renegotiation-and-denial-of-service-attacks
• https://bugzilla.redhat.com/show_bug.cgi?id=1921846
• https://security.gentoo.org/glsa/202208-10
• https://blog.qualys.com/product-tech/2011/10/31/tls-renegotiation-and-denial-of-service-attacks
• https://bugzilla.redhat.com/show_bug.cgi?id=1921846
• https://security.gentoo.org/glsa/202208-10

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