{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89147", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-09-11T01:23:34.216Z", "datePublished": "2026-09-11T10:46:56.944Z", "dateUpdated": "2026-09-24T14:21:35.209Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-09-24T14:21:35.209Z" }, "datePublic": "2026-09-09T00:00:00.000Z", "title": "Net-SNMP through 5.9.5.2 Denial of Service via Blocking Unauthenticated SMUX Read", "descriptions": [ { "lang": "en", "value": "Net-SNMP through 5.9.5.2 contains a denial of service vulnerability in the SMUX module where smux_accept() performs an unauthenticated blocking read without timeout on newly accepted connections. An unauthenticated remote client can connect to the SMUX listener and send no data, causing the single-threaded snmpd main loop to block indefinitely and suspend all SNMP processing." } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "cweId": "CWE-1088", "description": "CWE-1088: Synchronous Access of Remote Resource without Timeout", "type": "CWE" } ] }, { "descriptions": [ { "lang": "en", "cweId": "CWE-400", "description": "CWE-400: Uncontrolled Resource Consumption", "type": "CWE" } ] } ], "affected": [ { "defaultStatus": "unaffected", "vendor": "net-snmp", "product": "Net-SNMP", "packageURL": "pkg:github/net-snmp/net-snmp", "repo": "https://github.com/net-snmp/net-snmp", "versions": [ { "version": "0", "lessThanOrEqual": "5.9.5.2", "status": "affected", "versionType": "custom" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:a:net-snmp:net-snmp:*:*:*:*:*:*:*:*", "versionEndIncluding": "5.9.5.2" } ] } ] } ], "metrics": [ { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV3_1": { "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "version": "3.1", "baseSeverity": "HIGH", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" } }, { "format": "CVSS", "cvssV4_0": { "version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.7, "baseSeverity": "HIGH" } } ], "references": [ { "url": "https://gist.github.com/thesmartshadow/001cea595e75fed6aaea7389666dc9eb", "name": "Unauthenticated remote denial of service in Net-SNMP snmpd via blocking pre-authentication SMUX read", "tags": [ "third-party-advisory" ] }, { "url": "https://github.com/net-snmp/net-snmp/blob/v5.9.5.2/agent/mibgroup/smux/smux.c", "name": "agent/mibgroup/smux/smux.c at v5.9.5.2", "tags": [ "technical-description" ] }, { "url": "https://github.com/net-snmp/net-snmp", "name": "Product", "tags": [ "product" ] }, { "name": "VulnCheck Advisory: Net-SNMP through 5.9.5.2 Denial of Service via Blocking Unauthenticated SMUX Read", "tags": [ "third-party-advisory" ], "url": "https://www.vulncheck.com/advisories/net-snmp-through-5.9.5.2-denial-of-service-via-blocking-unauthenticated-smux-read" } ], "credits": [ { "lang": "en", "value": "Ali Firas", "type": "finder" } ], "source": { "discovery": "UNKNOWN" }, "x_generator": { "engine": "vulncheck-endgame" } }, "adp": [ { "references": [ { "url": "https://gist.github.com/thesmartshadow/001cea595e75fed6aaea7389666dc9eb", "tags": [ "exploit" ] } ], "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-09-15T16:06:21.094512Z", "id": "CVE-2026-89147", "options": [ { "Exploitation": "poc" }, { "Automatable": "yes" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-15T16:08:19.500Z" } } ] } }