CVE-2021-34741

A vulnerability in the email scanning algorithm of Cisco AsyncOS software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to perform a denial of service (DoS) attack against an affected device. This vulnerability is due to insufficient input validation of incoming emails. An attacker could exploit this vulnerability by sending a crafted email through Cisco ESA. A successful exploit could allow the attacker to exhaust all the available CPU resources on an affected device for an extended period of time, preventing other emails from being processed and resulting in a DoS condition.

Score

CVSS 3.1 7.5 High

Status

Modified - psirt@cisco.com

Published

2021-11-04

Last modified

2024-11-07

Weaknesses

CWE-770

Affected products

• Asyncos (Cisco)
• Cisco Email Security Appliance Esa (Cisco)

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-dos-JOm9ETfO