CVE-2020-26082: cisco asyncos Improper Input Validation

Vulnerability summary

CVE-2020-26082 is a medium (CVSS 5.8) Improper Input Validation vulnerability in cisco asyncos. EPSS estimates a 0.63% chance of exploitation in the next 30 days, higher than 49.1% of scored vulnerabilities.

Timeline

1. 04-08-2023
   PublishedVulnerability first disclosed.
2. 09-07-2025
   Last modifiedVulnerability information updated.

Description

A vulnerability in the zip decompression engine of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass content filters that are configured on an affected device. The vulnerability is due to improper handling of password-protected zip files. An attacker could exploit this vulnerability by sending a malicious file inside a crafted zip-compressed file to an affected device. A successful exploit could allow the attacker to bypass configured content filters that would normally drop the email.

• CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.