4.3
MEDIUM
CVE-2025-20151
Cisco SNMPv3 Authentication Bypass Vulnerability
Description

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.

INFO

Published Date :

May 7, 2025, 6:15 p.m.

Last Modified :

Aug. 5, 2025, 2:33 p.m.

Remotely Exploitable :

Yes !

Impact Score :

1.4

Exploitability Score :

2.8
Affected Products

The following products are affected by CVE-2025-20151 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Cisco ios_xe_sd-wan
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-20151.

URL Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmpv3-qKEYvzsy Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-20151 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2025-20151 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Aug. 05, 2025

    Action Type Old Value New Value
    Added CWE CWE-1284
    Added CPE Configuration OR *cpe:2.3:o:cisco:ios_xe_sd-wan:16.10.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.9.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.9.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.9.3:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.9.4:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.10.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.10.6:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.10.4:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.10.5:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.10.3:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.10.3a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.10.3b:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.11.1s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.11.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.11.1d:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.11.1f:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.11.1b:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.11.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.12.3:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.12.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.12.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.12.4a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.12.2r:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.12.1c:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.12.1b1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.12.4:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.12.1b:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.12.1d:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.12.1e:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe_sd-wan:16.12.5:*:*:*:*:*:*:*
    Added Reference Type Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmpv3-qKEYvzsy Types: Vendor Advisory
  • New CVE Received by [email protected]

    May. 07, 2025

    Action Type Old Value New Value
    Added Description 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.
    Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
    Added CWE CWE-16
    Added Reference https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmpv3-qKEYvzsy
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-20151 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-20151 weaknesses.

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability