What’s Vulnerable › Vulnerabilities

CVE-2019-1672: Cisco Web Security Appliance Decryption Policy Bypass Vulnerability

• Severity: medium (CVSS 5.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-02-08 · updated 2026-06-17
• Weakness: CWE-400

Description

A vulnerability in the Decryption Policy Default Action functionality of the Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to bypass a configured drop policy and allow traffic onto the network that should have been denied. The vulnerability is due to the incorrect handling of SSL-encrypted traffic when Decrypt for End-User Notification is disabled in the configuration. An attacker could exploit this vulnerability by sending a SSL connection through the affected device. A successful exploit could allow the attacker to bypass a configured drop policy to block specific SSL connections. Releases 10.1.x and 10.5.x are affected.

Affected products

• Cisco Web Security Appliance (WSA): 10.1.0-204, 10.5.2-072, 11.5.1-fcs-115

References

• http://www.securityfocus.com/bid/106904
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190206-wsa-bypass
• http://www.securityfocus.com/bid/106904
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190206-wsa-bypass

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