Vulnerability Database

326,214

Total vulnerabilities in the database

CVE-2025-20183

A vulnerability in a policy-based Cisco Application Visibility and Control (AVC) implementation of Cisco AsyncOS Software for Cisco Secure Web Appliance could allow an unauthenticated, remote attacker to evade the antivirus scanner and download a malicious file onto an endpoint. 

The vulnerability is due to improper handling of a crafted range request header. An attacker could exploit this vulnerability by sending an HTTP request with a crafted range request header through the affected device. A successful exploit could allow the attacker to evade the antivirus scanner and download malware onto the endpoint without detection by Cisco Secure Web Appliance.

  • Published: Feb 5, 2025
  • Updated: Nov 16, 2025
  • CVE: CVE-2025-20183
  • Severity: Medium
  • Exploit:

CVSS v3:

  • Severity: Medium
  • Score: 5.8
  • AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

CWEs:

Software From Fixed in
cisco / asyncos 11.8.0-414 11.8.0-414.x
cisco / asyncos 11.8.0-429 11.8.0-429.x
cisco / asyncos 11.8.0-453 11.8.0-453.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 11.8.4-004 11.8.4-004.x
cisco / asyncos 12.0.1-268 12.0.1-268.x
cisco / asyncos 12.0.1-334 12.0.1-334.x
cisco / asyncos 12.0.2-004 12.0.2-004.x
cisco / asyncos 12.0.2-012 12.0.2-012.x
cisco / asyncos 12.0.3-005 12.0.3-005.x
cisco / asyncos 12.0.3-007 12.0.3-007.x
cisco / asyncos 12.0.4-002 12.0.4-002.x
cisco / asyncos 12.0.5-011 12.0.5-011.x
cisco / asyncos 12.5.1-011 12.5.1-011.x
cisco / asyncos 12.5.1-043 12.5.1-043.x
cisco / asyncos 12.5.2-007 12.5.2-007.x
cisco / asyncos 12.5.2-011 12.5.2-011.x
cisco / asyncos 12.5.3-002 12.5.3-002.x
cisco / asyncos 12.5.4-005 12.5.4-005.x
cisco / asyncos 12.5.4-011 12.5.4-011.x
cisco / asyncos 12.5.5-004 12.5.5-004.x
cisco / asyncos 12.5.5-005 12.5.5-005.x
cisco / asyncos 12.5.5-008 12.5.5-008.x
cisco / asyncos 12.5.6-008 12.5.6-008.x
cisco / asyncos 14.0.1-014 14.0.1-014.x
cisco / asyncos 14.0.1-040 14.0.1-040.x
cisco / asyncos 14.0.1-053 14.0.1-053.x
cisco / asyncos 14.0.1-503 14.0.1-503.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 14.0.5-007 14.0.5-007.x
cisco / asyncos 14.1.0-032 14.1.0-032.x
cisco / asyncos 14.1.0-041 14.1.0-041.x
cisco / asyncos 14.1.0-047 14.1.0-047.x
cisco / asyncos 14.5.0-498 14.5.0-498.x
cisco / asyncos 14.5.0-537 14.5.0-537.x
cisco / asyncos 14.5.0-673 14.5.0-673.x
cisco / asyncos 14.5.1-008 14.5.1-008.x
cisco / asyncos 14.5.1-016 14.5.1-016.x
cisco / asyncos 14.5.1-510 14.5.1-510.x
cisco / asyncos 14.5.1-607 14.5.1-607.x
cisco / asyncos 14.5.2-011 14.5.2-011.x
cisco / asyncos 14.5.3-033 14.5.3-033.x
cisco / asyncos 15.0.0-322 15.0.0-322.x
cisco / asyncos 15.0.0-355 15.0.0-355.x
cisco / asyncos 15.1.0-287 15.1.0-287.x
cisco / asyncos 15.2.0-116 15.2.0-116.x
cisco / asyncos 15.2.0-164 15.2.0-164.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.