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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-20201
• 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