{"id":"CVE-2025-20151","title":"Cisco IOS and IOS XE Software SNMPv3 Configuration Restriction Vulnerability (CVE-2025-20151)","summary":"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,…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","cvssSource":"vendor","vendor":"Cisco","product":"IOS","affected":["ios 15.1(2)T","ios 12.2(46)EY","ios 12.2(25)SW9","ios 12.2(31)XN2","ios 12.2(31)SB1a","ios 12.2(50)SG3","ios 12.3(14)YQ5","ios 12.2(25)EWA5","ios 12.2(18)SXD7b","ios 12.3(4)XD4","ios 12.3(11)YF2","ios 12.2(2)XT2","ios 12.2(2)XH1","ios 12.2(28)SB10","ios 12.4(21a)JHA","ios 12.4(21a)M1","ios 12.4(4)T8","ios 12.2(15)CZ1","ios 12.2(20)S10","ios 12.2(15)MC1c","ios 12.4(20)T1","ios 12.2(33)IRC","ios 12.2(4)MB7","ios 12.3(8)YG7","ios 12.4(22)XR5","ios 12.2(55)EY","ios 12.4(15)XY4","ios 12.2(25)EWA1","ios 12.2(31)SB10c","ios 12.2(31)SB9b","ios 12.3(8)T9","ios 12.3(8)XY3","ios 12.2(4)XV1","ios 12.2(15)MC2g","ios 12.2(33)SCB9","ios 12.4(24)MDA","ios 12.2(33)ZI","ios 12.2(4)B7a","ios 12.2(8)MC2","ios 12.2(13)JA2"],"published":"2025-05-07","updated":"2025-05-07","sourceUpdated":"2025-05-07T16:00:00+00:00","source":"CSAF","sourceUrl":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmpv3-qKEYvzsy","references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmpv3-qKEYvzsy"},{"url":"https://software.cisco.com"}],"tags":["csaf","vendor-advisory","cisco"],"epss":0.00394,"epssPercentile":0.33431,"ingestedAt":"2026-09-08T15:58:18.536Z","slug":"CVE-2025-20151","body":"## Overview\n\nA 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.\r\n\r\nThis 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.\r\n\r\nNote: The attacker has no control of the SNMPv3 configuration. To exploit this vulnerability, the attacker must have valid SNMPv3 user credentials.\r\n\r\nFor more information, see the Details [\"#details\"] section of this advisory.\r\n\r\nCisco has not released software updates that address this vulnerability. However, there is a new method for configuring SNMPv3 so that it will not be affected by this vulnerability. There are workarounds that address this vulnerability.\r\n\r\n\r\n\r\nThis advisory is part of the May 2025 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: May 2025 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication [\"https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75279\"].\n\n## Vendor advisories\n\n- **cisco-sa-snmpv3-qKEYvzsy** · Cisco · affected: IOS (3503 versions), Cisco 1000 Series Integrated Services Routers, Cisco ASR 1000 Series Aggregation Services Routers, Cisco 4000 Series Integrated Services Routers, Cisco Integrated Services Virtual Router, Cisco Cloud Services Router 1000V Series, … · updated 2025-05-07 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmpv3-qKEYvzsy)\n\n**Cisco IOS and IOS XE Software SNMPv3 Configuration Restriction Vulnerability**. Released 2025-05-07.\n\nAffected:\n\n- IOS 15.1(2)T\n- IOS 12.2(46)EY\n- IOS 12.2(25)SW9\n- IOS 12.2(31)XN2\n- IOS 12.2(31)SB1a\n- IOS 12.2(50)SG3\n- IOS 12.3(14)YQ5\n- IOS 12.2(25)EWA5\n- IOS 12.2(18)SXD7b\n- IOS 12.3(4)XD4\n- IOS 12.3(11)YF2\n- IOS 12.2(2)XT2\n- IOS 12.2(2)XH1\n- IOS 12.2(28)SB10\n- IOS 12.4(21a)JHA\n- IOS 12.4(21a)M1\n- IOS 12.4(4)T8\n- IOS 12.2(15)CZ1\n- IOS 12.2(20)S10\n- IOS 12.2(15)MC1c\n- IOS 12.4(20)T1\n- IOS 12.2(33)IRC\n- IOS 12.2(4)MB7\n- IOS 12.3(8)YG7\n- IOS 12.4(22)XR5\n- IOS 12.2(55)EY\n- IOS 12.4(15)XY4\n- IOS 12.2(25)EWA1\n- IOS 12.2(31)SB10c\n- IOS 12.2(31)SB9b\n- IOS 12.3(8)T9\n- IOS 12.3(8)XY3\n- IOS 12.2(4)XV1\n- IOS 12.2(15)MC2g\n- IOS 12.2(33)SCB9\n- IOS 12.4(24)MDA\n- IOS 12.2(33)ZI\n- IOS 12.2(4)B7a\n- IOS 12.2(8)MC2\n- IOS 12.2(13)JA2\n\n## Remediation\n\nCisco has released software updates that address this vulnerability. https://software.cisco.com","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}