Vulnerability Database

326,214

Total vulnerabilities in the database

CVE-2024-20256

A vulnerability in the web-based management interface of Cisco AsyncOS Software for Cisco Secure Email and Web Manager and Secure Web Appliance could allow an authenticated, remote attacker to conduct an XSS attack against a user of the interface.

This vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user of an affected interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

  • Published: May 15, 2024
  • Updated: Nov 16, 2025
  • CVE: CVE-2024-20256
  • Severity: Low
  • Exploit:

CVSS v3:

  • Severity: Low
  • Score: 4.8
  • AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Software From Fixed in
cisco / asyncos 11.7.0-406 11.7.0-406.x
cisco / asyncos 11.7.0-418 11.7.0-418.x
cisco / asyncos 11.7.1-006 11.7.1-006.x
cisco / asyncos 11.7.1-020 11.7.1-020.x
cisco / asyncos 11.7.1-049 11.7.1-049.x
cisco / asyncos 11.7.2-011 11.7.2-011.x
cisco / asyncos 11.8.0-414 11.8.0-414.x
cisco / asyncos 11.8.1-023 11.8.1-023.x
cisco / asyncos 11.8.3-018 11.8.3-018.x
cisco / asyncos 11.8.3-021 11.8.3-021.x
cisco / asyncos 12.0.1-268 12.0.1-268.x
cisco / asyncos 12.0.3-007 12.0.3-007.x
cisco / asyncos 12.5.1-011 12.5.1-011.x
cisco / asyncos 12.5.2-007 12.5.2-007.x
cisco / asyncos 12.5.4-005 12.5.4-005.x
cisco / asyncos 12.5.5-004 12.5.5-004.x
cisco / asyncos 12.5.6-008 12.5.6-008.x
cisco / asyncos 14.0.2-012 14.0.2-012.x
cisco / asyncos 14.0.3-014 14.0.3-014.x
cisco / asyncos 14.0.4-005 14.0.4-005.x
cisco / asyncos 14.5.0-498 14.5.0-498.x
cisco / asyncos 14.5.1-016 14.5.1-016.x
cisco / asyncos 15.0.0-322 15.0.0-322.x
cisco / asyncos 9.0.0-087 9.0.0-087.x
cisco / asyncos 11.0.0-115 11.0.0-115.x
cisco / asyncos 11.0.1-161 11.0.1-161.x
cisco / asyncos 11.5.1-105 11.5.1-105.x
cisco / asyncos 12.0.0-452 12.0.0-452.x
cisco / asyncos 12.0.1-011 12.0.1-011.x
cisco / asyncos 12.5.0-636 12.5.0-636.x
cisco / asyncos 12.5.0-658 12.5.0-658.x
cisco / asyncos 12.5.0-670 12.5.0-670.x
cisco / asyncos 12.5.0-678 12.5.0-678.x
cisco / asyncos 12.8.1-002 12.8.1-002.x
cisco / asyncos 12.8.1-021 12.8.1-021.x
cisco / asyncos 13.0.0-277 13.0.0-277.x
cisco / asyncos 13.6.2-078 13.6.2-078.x
cisco / asyncos 13.8.1-068 13.8.1-068.x
cisco / asyncos 13.8.1-074 13.8.1-074.x
cisco / asyncos 13.8.1-108 13.8.1-108.x
cisco / asyncos 14.0.0-404 14.0.0-404.x
cisco / asyncos 14.1.0-223 14.1.0-223.x
cisco / asyncos 14.1.0-227 14.1.0-227.x
cisco / asyncos 14.2.0-212 14.2.0-212.x
cisco / asyncos 14.2.0-224 14.2.0-224.x
cisco / asyncos 14.2.1-020 14.2.1-020.x
cisco / asyncos 14.3.0-120 14.3.0-120.x
cisco / asyncos 15.0.0-334 15.0.0-334.x

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.