Vulnerability Database

328,409

Total vulnerabilities in the database

CVE-2025-20151

A vulnerability in the implementation of the Simple Network Management Protocol Version 3 (SNMPv3) feature of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to poll an affected device using SNMP, even if the device is configured to deny SNMP traffic from an unauthorized source or the SNMPv3 username is removed from the configuration.

This vulnerability exists because of the way that the SNMPv3 configuration is stored in the Cisco IOS Software and Cisco IOS XE Software startup configuration. An attacker could exploit this vulnerability by polling an affected device from a source address that should have been denied. A successful exploit could allow the attacker to perform SNMP operations from a source that should be denied. Note: The attacker has no control of the SNMPv3 configuration. To exploit this vulnerability, the attacker must have valid SNMPv3 user credentials. For more information, see the section of this advisory.

  • Published: May 7, 2025
  • Updated: Nov 16, 2025
  • CVE: CVE-2025-20151
  • Severity: Low
  • Exploit:

CVSS v3:

  • Severity: Low
  • Score: 4.3
  • AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Software From Fixed in
cisco / ios_xe_sd-wan 16.10.1 16.10.1.x
cisco / ios_xe_sd-wan 16.9.1 16.9.1.x
cisco / ios_xe_sd-wan 16.9.2 16.9.2.x
cisco / ios_xe_sd-wan 16.9.3 16.9.3.x
cisco / ios_xe_sd-wan 16.9.4 16.9.4.x
cisco / ios_xe_sd-wan 16.10.2 16.10.2.x
cisco / ios_xe_sd-wan 16.10.6 16.10.6.x
cisco / ios_xe_sd-wan 16.10.4 16.10.4.x
cisco / ios_xe_sd-wan 16.10.5 16.10.5.x
cisco / ios_xe_sd-wan 16.10.3 16.10.3.x
cisco / ios_xe_sd-wan 16.10.3a 16.10.3a.x
cisco / ios_xe_sd-wan 16.10.3b 16.10.3b.x
cisco / ios_xe_sd-wan 16.11.1s 16.11.1s.x
cisco / ios_xe_sd-wan 16.11.1a 16.11.1a.x
cisco / ios_xe_sd-wan 16.11.1d 16.11.1d.x
cisco / ios_xe_sd-wan 16.11.1f 16.11.1f.x
cisco / ios_xe_sd-wan 16.11.1b 16.11.1b.x
cisco / ios_xe_sd-wan 16.11.1 16.11.1.x
cisco / ios_xe_sd-wan 16.12.3 16.12.3.x
cisco / ios_xe_sd-wan 16.12.1 16.12.1.x
cisco / ios_xe_sd-wan 16.12.1a 16.12.1a.x
cisco / ios_xe_sd-wan 16.12.4a 16.12.4a.x
cisco / ios_xe_sd-wan 16.12.2r 16.12.2r.x
cisco / ios_xe_sd-wan 16.12.1c 16.12.1c.x
cisco / ios_xe_sd-wan 16.12.1b1 16.12.1b1.x
cisco / ios_xe_sd-wan 16.12.4 16.12.4.x
cisco / ios_xe_sd-wan 16.12.1b 16.12.1b.x
cisco / ios_xe_sd-wan 16.12.1d 16.12.1d.x
cisco / ios_xe_sd-wan 16.12.1e 16.12.1e.x
cisco / ios_xe_sd-wan 16.12.5 16.12.5.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.