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 Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Cisco IOS Software to the latest version.
- Update Cisco IOS XE Software to the latest version.
- Review and reapply SNMP access controls.
- Monitor SNMP traffic for unauthorized access attempts.
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 |
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.
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