{"schema_version":"public-product-v1.1","generated_at":"2026-07-21T09:59:57Z","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","advisory":{"id":"cisco-sa-nxos-dsnmp-cNN39Uh","slug":"cisco-sa-nxos-dsnmp-cnn39uh","vendor":"Cisco","title":"Cisco Nexus 9000 Series Fabric Switches in ACI Mode SNMP Denial of Service Vulnerability","summary":"A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper processing when parsing SNMP requests. An attacker could exploit this vulnerability by continuously sending SNMP queries to a specific MIB of an affected device. A successful exploit could allow the attacker to cause a kernel panic on the device, resulting in a reload and a DoS condition. Note: This vulnerability affects SNMP versions 1, 2c, and 3. To exploit this vulnerability through SNMPv1 or SNMPv2c, the attacker must have a valid read-only SNMP community string for the affected system. To exploit this vulnerability through SNMPv3, the attacker must have valid SNMP user credentials for the affected system. Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-dsnmp-cNN39Uh This advisory is part of the February 2026 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: February 2026 Semiannual Cisco FXOS and NX-OS Software Security Advisory Bundled Publication.","severity":"High","published_at":"2026-02-25T16:00:00Z","updated_at":"2026-02-25T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-dsnmp-cNN39Uh","csaf_url":"https://sec.cloudapps.cisco.com/security/center/contentjson/CiscoSecurityAdvisory/cisco-sa-nxos-dsnmp-cNN39Uh/csaf/cisco-sa-nxos-dsnmp-cNN39Uh.json","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure."},"freshness":{"last_source_refreshed_at":"2026-07-21T05:16:34Z","latest_source_refresh_at":"2026-07-21T05:16:34Z","oldest_source_refresh_at":"2026-07-21T03:00:03Z","all_sources_fresh":true,"sources":[{"source":"cisco_advisories","label":"Cisco advisories","last_success_at":"2026-07-21T03:00:03Z","stale":false},{"source":"cisco_csaf","label":"Cisco CSAF","last_success_at":"2026-07-21T05:14:24Z","stale":false},{"source":"nvd_cves","label":"NVD CVEs","last_success_at":"2026-07-21T05:16:30Z","stale":false},{"source":"cisa_kev","label":"CISA KEV","last_success_at":"2026-07-21T05:16:31Z","stale":false},{"source":"first_epss","label":"EPSS","last_success_at":"2026-07-21T05:16:34Z","stale":false}]},"summary":{"cve_count":1,"visible_product_count":1,"public_evidence_count":1,"kev_count":0,"highest_epss":0.00302},"cves":[{"id":"CVE-2026-20048","kev":false,"epss":{"score":0.00302,"percentile":0.22307,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"}}],"public_evidence":[{"product":{"name":"Cisco Nexus 9000 Series Switches","slug":"cisco-nexus-9000-series-switches","vendor":"Cisco"},"cve":{"id":"CVE-2026-20048"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco CSAF","source_document_fetched_at":"2026-07-20T04:21:44Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco NX-OS System Software in ACI Mode 15.2(1g) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(2e) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(2f) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(2g) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(2h) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(3e) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(3f) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(3g) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(4d) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(4e) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(4f) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(5c) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(5d) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(5e) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(6e) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(6g) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(6h) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(7f) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(7g) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(8d) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(8e) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(8f) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(8g) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(8h) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.2(8i) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.3(1d) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.3(2a) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.3(2b) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.3(2c) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.3(2d) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.3(2e) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 15.3(2f) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(1g) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(1j) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(2h) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(2j) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(3d) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(3e) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(3g) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(4c) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(5h) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(5j) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(6c) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(6h) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(7e) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(8e) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(8f) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(8h) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(9c) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(9d) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.0(9e) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.1(1f) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.1(2f) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.1(2g) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.1(3f) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.1(3g) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS System Software in ACI Mode 16.1(4h) when installed on Cisco Nexus 9000 Series Switches","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","exposure_verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","kev":false,"epss":{"score":0.00302,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"},"published_at":"2026-02-25T16:00:00Z","updated_at":"2026-02-25T16:00:00Z","advisory_updated_at":"2026-02-25T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-dsnmp-cNN39Uh","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-dsnmp-cNN39Uh"},"row_display_order":1}]}