Vulnerability Database

328,409

Total vulnerabilities in the database

CVE-2025-20196

A vulnerability in the Cisco IOx application hosting environment of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the Cisco IOx application hosting environment to stop responding, resulting in a denial of service (DoS) condition.

This vulnerability is due to the improper handling of HTTP requests. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to cause the Cisco IOx application hosting environment to stop responding. The IOx process will need to be manually restarted to recover services.

  • Published: May 7, 2025
  • Updated: Nov 16, 2025
  • CVE: CVE-2025-20196
  • Severity: Medium
  • Exploit:

CVSS v3:

  • Severity: Medium
  • Score: 5.3
  • AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CWEs:

Software From Fixed in
cisco / ios_xe 16.2.1 16.2.1.x
cisco / ios_xe 16.1.3 16.1.3.x
cisco / ios_xe 16.1.2 16.1.2.x
cisco / ios_xe 16.1.1 16.1.1.x
cisco / ios_xe 16.4.1 16.4.1.x
cisco / ios_xe 16.2.2 16.2.2.x
cisco / ios_xe 16.3.1 16.3.1.x
cisco / ios_xe 16.3.2 16.3.2.x
cisco / ios_xe 16.3.3 16.3.3.x
cisco / ios_xe 16.3.1a 16.3.1a.x
cisco / ios_xe 16.3.4 16.3.4.x
cisco / ios_xe 16.3.5 16.3.5.x
cisco / ios_xe 16.3.5b 16.3.5b.x
cisco / ios_xe 16.3.6 16.3.6.x
cisco / ios_xe 16.4.2 16.4.2.x
cisco / ios_xe 16.5.1 16.5.1.x
cisco / ios_xe 16.5.1a 16.5.1a.x
cisco / ios_xe 16.5.1b 16.5.1b.x
cisco / ios_xe 16.3.7 16.3.7.x
cisco / ios_xe 16.3.8 16.3.8.x
cisco / ios_xe 16.3.9 16.3.9.x
cisco / ios_xe 16.3.10 16.3.10.x
cisco / ios_xe 16.3.11 16.3.11.x
cisco / ios_xe 16.4.3 16.4.3.x
cisco / ios_xe 16.5.2 16.5.2.x
cisco / ios_xe 16.5.3 16.5.3.x
cisco / ios_xe 17.1.1 17.1.1.x
cisco / ios_xe 17.1.1a 17.1.1a.x
cisco / ios_xe 17.1.1s 17.1.1s.x
cisco / ios_xe 17.1.1t 17.1.1t.x
cisco / ios_xe 17.1.3 17.1.3.x
cisco / ios_xe 17.2.1 17.2.1.x
cisco / ios_xe 17.2.1r 17.2.1r.x
cisco / ios_xe 17.2.1a 17.2.1a.x
cisco / ios_xe 17.2.1v 17.2.1v.x
cisco / ios_xe 17.2.2 17.2.2.x
cisco / ios_xe 17.3.1 17.3.1.x
cisco / ios_xe 17.3.2 17.3.2.x
cisco / ios_xe 17.3.1a 17.3.1a.x
cisco / ios_xe 17.4.1 17.4.1.x
cisco / ios_xe 17.4.1a 17.4.1a.x
cisco / ios_xe 17.4.1b 17.4.1b.x
cisco / ios_xe 17.2.3 17.2.3.x
cisco / ios_xe 17.3.3 17.3.3.x
cisco / ios_xe 17.3.1w 17.3.1w.x
cisco / ios_xe 17.3.2a 17.3.2a.x
cisco / ios_xe 17.3.1x 17.3.1x.x
cisco / ios_xe 17.3.1z 17.3.1z.x
cisco / ios_xe 17.3.4 17.3.4.x
cisco / ios_xe 17.3.5 17.3.5.x
cisco / ios_xe 17.3.4a 17.3.4a.x
cisco / ios_xe 17.3.6 17.3.6.x
cisco / ios_xe 17.3.4b 17.3.4b.x
cisco / ios_xe 17.3.4c 17.3.4c.x
cisco / ios_xe 17.3.5a 17.3.5a.x
cisco / ios_xe 17.3.5b 17.3.5b.x
cisco / ios_xe 17.3.7 17.3.7.x
cisco / ios_xe 17.4.2 17.4.2.x
cisco / ios_xe 17.4.2a 17.4.2a.x
cisco / ios_xe 17.5.1 17.5.1.x
cisco / ios_xe 17.5.1a 17.5.1a.x
cisco / ios_xe 17.6.1 17.6.1.x
cisco / ios_xe 17.6.2 17.6.2.x
cisco / ios_xe 17.6.1w 17.6.1w.x
cisco / ios_xe 17.6.1a 17.6.1a.x
cisco / ios_xe 17.6.1x 17.6.1x.x
cisco / ios_xe 17.6.3 17.6.3.x
cisco / ios_xe 17.6.1y 17.6.1y.x
cisco / ios_xe 17.6.1z 17.6.1z.x
cisco / ios_xe 17.6.3a 17.6.3a.x
cisco / ios_xe 17.6.4 17.6.4.x
cisco / ios_xe 17.6.1z1 17.6.1z1.x
cisco / ios_xe 17.6.5 17.6.5.x
cisco / ios_xe 17.7.1 17.7.1.x
cisco / ios_xe 17.7.1a 17.7.1a.x
cisco / ios_xe 17.7.1b 17.7.1b.x
cisco / ios_xe 17.7.2 17.7.2.x
cisco / ios_xe 17.10.1 17.10.1.x
cisco / ios_xe 17.10.1a 17.10.1a.x
cisco / ios_xe 17.10.1b 17.10.1b.x
cisco / ios_xe 17.8.1 17.8.1.x
cisco / ios_xe 17.8.1a 17.8.1a.x
cisco / ios_xe 17.9.1 17.9.1.x
cisco / ios_xe 17.9.1w 17.9.1w.x
cisco / ios_xe 17.9.2 17.9.2.x
cisco / ios_xe 17.9.1a 17.9.1a.x
cisco / ios_xe 17.9.1x 17.9.1x.x
cisco / ios_xe 17.9.1y 17.9.1y.x
cisco / ios_xe 17.9.3 17.9.3.x
cisco / ios_xe 17.11.1 17.11.1.x
cisco / ios_xe 17.3.8 17.3.8.x
cisco / ios_xe 17.3.8a 17.3.8a.x
cisco / ios_xe 17.6.6 17.6.6.x
cisco / ios_xe 17.6.6a 17.6.6a.x
cisco / ios_xe 17.6.5a 17.6.5a.x
cisco / ios_xe 17.6.7 17.6.7.x
cisco / ios_xe 17.6.8 17.6.8.x
cisco / ios_xe 17.6.8a 17.6.8a.x
cisco / ios_xe 17.9.2a 17.9.2a.x
cisco / ios_xe 17.9.1x1 17.9.1x1.x
cisco / ios_xe 17.9.3a 17.9.3a.x
cisco / ios_xe 17.9.4 17.9.4.x
cisco / ios_xe 17.9.1y1 17.9.1y1.x
cisco / ios_xe 17.9.5 17.9.5.x
cisco / ios_xe 17.9.4a 17.9.4a.x
cisco / ios_xe 17.9.5a 17.9.5a.x
cisco / ios_xe 17.9.5b 17.9.5b.x
cisco / ios_xe 17.9.6 17.9.6.x
cisco / ios_xe 17.9.6a 17.9.6a.x
cisco / ios_xe 17.9.5e 17.9.5e.x
cisco / ios_xe 17.9.5f 17.9.5f.x
cisco / ios_xe 17.11.1a 17.11.1a.x
cisco / ios_xe 17.12.1 17.12.1.x
cisco / ios_xe 17.12.1w 17.12.1w.x
cisco / ios_xe 17.12.1a 17.12.1a.x
cisco / ios_xe 17.12.1x 17.12.1x.x
cisco / ios_xe 17.12.2 17.12.2.x
cisco / ios_xe 17.12.3 17.12.3.x
cisco / ios_xe 17.12.2a 17.12.2a.x
cisco / ios_xe 17.12.1y 17.12.1y.x
cisco / ios_xe 17.12.1z 17.12.1z.x
cisco / ios_xe 17.12.4 17.12.4.x
cisco / ios_xe 17.12.3a 17.12.3a.x
cisco / ios_xe 17.12.1z1 17.12.1z1.x
cisco / ios_xe 17.12.1z2 17.12.1z2.x
cisco / ios_xe 17.12.4a 17.12.4a.x
cisco / ios_xe 17.12.4b 17.12.4b.x
cisco / ios_xe 17.12.1z4 17.12.1z4.x
cisco / ios_xe 17.13.1 17.13.1.x
cisco / ios_xe 17.13.1a 17.13.1a.x
cisco / ios_xe 17.14.1 17.14.1.x
cisco / ios_xe 17.14.1a 17.14.1a.x
cisco / ios_xe 17.11.99sw 17.11.99sw.x
cisco / ios_xe 17.15.2 17.15.2.x
cisco / ios_xe 17.15.2c 17.15.2c.x
cisco / ios_xe 17.15.2a 17.15.2a.x
cisco / ios_xe 17.15.2b 17.15.2b.x
cisco / cgr1000_firmware - 15.9\(3\)m12
cisco / ic3000_industrial_compute_gateway_firmware - 1.5.2
cisco / 807_industrial_integrated_services_router_firmware - 15.9\(3\)m11
cisco / 809_industrial_integrated_services_router_firmware - 15.9\(3\)m11
cisco / 829_industrial_integrated_services_router_firmware - 15.9\(3\)m11
cisco / ios_xe - 17.15.2

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.