{"api_version":"1","generated_at":"2026-08-20T14:29:10+00:00","cve":"CVE-2026-20124","urls":{"html":"https://cve.report/CVE-2026-20124","api":"https://cve.report/api/cve/CVE-2026-20124.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-20124","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-20124"},"summary":{"title":"Cisco IOS XE Software SNMP Denial of Service Vulnerability","description":"A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS XE Software could allow an authenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition.\r\n\r\nThis vulnerability is due to improper error handling when parsing SNMP requests. This vulnerability affects all versions of SNMP — Versions 1, 2c, and 3. An attacker could exploit this vulnerability by sending a malformed SNMP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly. The attacker must have the SNMPv1 or v2c read-only or read-write community string or valid SNMPv3 user credentials on the affected device.","state":"PUBLISHED","assigner":"cisco","published_at":"2026-08-05 17:16:46","updated_at":"2026-08-06 15:44:56"},"problem_types":["CWE-772","CWE-772 Missing Release of Resource after Effective Lifetime"],"metrics":[{"version":"3.1","source":"psirt@cisco.com","type":"Secondary","score":"7.7","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","baseScore":7.7,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"CVSSV3_1","score":"7.7","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.7,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-snmp-dos-ZAqNm4MD","name":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-snmp-dos-ZAqNm4MD","refsource":"psirt@cisco.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-20124","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20124","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Cisco","product":"Cisco IOS XE Software","version":"affected 17.2.1a","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco IOS XE Software","version":"affected 3.18.7SP","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco IOS XE Software","version":"affected 16.12.1y","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco IOS XE Software","version":"affected 16.12.3s","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco IOS XE Software","version":"affected 16.7.1b","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco IOS XE Software","version":"affected 16.6.2","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco IOS XE Software","version":"affected 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vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS XE Software could allow an authenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition.\r\n\r\nThis vulnerability is due to improper error handling when parsing SNMP requests. This vulnerability affects all versions of SNMP — Versions 1, 2c, and 3. An attacker could exploit this vulnerability by sending a malformed SNMP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly. The attacker must have the SNMPv1 or v2c read-only or read-write community string or valid SNMPv3 user credentials on the affected device."}],"exploits":[{"lang":"en","value":"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."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.7,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","version":"3.1"},"format":"cvssV3_1"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-772","description":"Missing Release of Resource after Effective Lifetime","lang":"en","type":"cwe"}]}],"providerMetadata":{"dateUpdated":"2026-08-05T16:18:21.590Z","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","shortName":"cisco"},"references":[{"name":"cisco-sa-iosxe-snmp-dos-ZAqNm4MD","url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-snmp-dos-ZAqNm4MD"}],"source":{"advisory":"cisco-sa-iosxe-snmp-dos-ZAqNm4MD","defects":["CSCws90638"],"discovery":"EXTERNAL"},"title":"Cisco IOS XE Software SNMP Denial of Service Vulnerability"}},"cveMetadata":{"assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","assignerShortName":"cisco","cveId":"CVE-2026-20124","datePublished":"2026-08-05T16:18:21.590Z","dateReserved":"2025-10-08T11:59:15.378Z","dateUpdated":"2026-08-05T17:20:47.421Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-05 17:16:46","lastModifiedDate":"2026-08-06 15:44:56","problem_types":["CWE-772","CWE-772 Missing Release of Resource after Effective Lifetime"],"metrics":{"cvssMetricV31":[{"source":"psirt@cisco.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","baseScore":7.7,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.1,"impactScore":4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-08-05T17:20:40.573517Z","id":"CVE-2026-20124","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"20124","Ordinal":"1","Title":"Cisco IOS XE Software SNMP Denial of Service Vulnerability","CVE":"CVE-2026-20124","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"20124","Ordinal":"1","NoteData":"A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS XE Software could allow an authenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition.\r\n\r\nThis vulnerability is due to improper error handling when parsing SNMP requests. This vulnerability affects all versions of SNMP — Versions 1, 2c, and 3. An attacker could exploit this vulnerability by sending a malformed SNMP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly. The attacker must have the SNMPv1 or v2c read-only or read-write community string or valid SNMPv3 user credentials on the affected device.","Type":"Description","Title":"Cisco IOS XE Software SNMP Denial of Service Vulnerability"}]}}}