What’s Vulnerable › Vulnerabilities

CVE-2020-3370: Cisco Content Security Management Appliance Filter Bypass Vulnerability

• Severity: medium (CVSS 5.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-07-16 · updated 2026-06-17
• Weakness: CWE-20

Description

A vulnerability in URL filtering of Cisco Content Security Management Appliance (SMA) could allow an unauthenticated, remote attacker to bypass URL filtering on an affected device. The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending a crafted, malicious HTTP request to an affected device. A successful exploit could allow the attacker to redirect users to malicious sites.

Affected products

• Cisco Email Security Appliance (ESA): before 13.0.1; from 13.5.0 before 13.5.1 — fixed in 13.0.1, 13.5.1

How to fix

Upgrade to a fixed version: Cisco Email Security Appliance (ESA) 13.0.1, 13.5.1. Check the vendor advisory for mitigations.

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ESA-filt-39jXvMfM
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ESA-filt-39jXvMfM

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