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CVE-2025-20151

Cisco IOS and IOS XE Software SNMPv3 Configuration Restriction Vulnerability

Medium4.3EPSS 0.42%
Published
Updated
Reserved
Assigned by
cisco

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.

Timeline

  1. ID reserved

    By cisco

  2. · 7 months later

    Published

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-20151, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1Medium4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
NVDNVD · Analyzed3.1Medium4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
EPSS (exploitation in 30 days)
0.42% · top 64% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.

Weakness

Affected products

  • Cisco · Cisco IOS XE Catalyst SD-WAN

    • affected 16.10.6
    • affected 16.12.3
    • affected 16.12.1
    • affected 16.12.1a
    • affected 16.12.4a
    • affected 16.12.2r
    • affected 16.12.1c
    • affected 16.10.4
    • affected 16.12.1b1
    • affected 16.10.5
    • affected 16.12.4
    • affected 16.10.3
    • affected 16.10.3a
    • affected 16.12.1b
    • affected 16.10.3b
    • affected 16.12.1d
    • affected 16.11.1s
    • affected 16.9.1
    • affected 16.11.1a
    • affected 16.11.1d
    • affected 16.9.2
    • affected 16.10.1
    • affected 16.11.1f
    • affected 16.9.4
    • affected 16.9.3
    • affected 16.10.2
    • affected 16.12.1e
    • affected 16.11.1b
    • affected 16.11.1
    • affected 16.12.5

What to do

Exploitation: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

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Record last updated .