{"id":"CVE-2017-6736","published":"2017-07-17T21:29:00Z","modified":"2026-06-17T01:22:53Z","title":"Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability","vendor":"Cisco","product":"IOS and IOS XE Software","tier":"core","eol":null,"description":{"text":"The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilities that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload. An attacker could exploit these vulnerabilities by sending a crafted SNMP packet to an affected system via IPv4 or IPv6. Only traffic directed to an affected system can be used to exploit these vulnerabilities.\r\n\r The vulnerabilities are due to a buffer overflow condition in the SNMP subsystem of the affected software. The vulnerabilities affect all versions of SNMP - Versions 1, 2c, and 3. To exploit these vulnerabilities via SNMP Version 2c or earlier, the attacker must know the SNMP read-only community string for the affected system. To exploit these vulnerabilities via SNMP Version 3, the attacker must have user credentials for the affected system. A successful exploit could allow the attacker to execute arbitrary code and obtain full control of the affected system or cause the affected system to reload.\r\n\r Customers are advised to apply the workaround as contained in the Workarounds section below. Fixed software information is available via the Cisco IOS Software Checker. All devices that have enabled SNMP and have not explicitly excluded the affected MIBs or OIDs should be considered vulnerable.\r\n\r   There are workarounds that address these vulnerabilities.","provenance":"source","from":"NVD"},"summary":{"text":"The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains a buffer overflow flaw that affects SNMP Versions 1, 2c, and 3. An attacker with network access to an affected system, reachable over IPv4 or IPv6 via a crafted SNMP packet, could execute arbitrary code with full control of the device or cause it to reload, but must first hold valid credentials: the SNMP read-only community string for Versions 2c and earlier, or user credentials for Version 3.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:04:54Z"},"cvss":{"score":8.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.70354,"percentile":0.99384,"date":"2026-10-28","provenance":"source"},"kev":{"dateAdded":"2022-03-03","dueDate":"2022-03-24","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2017-6736","provenance":"source"},"vulncheckKev":{"dateAdded":"2019-04-17","exploitedFirstSeen":"2019-04-17","ransomware":false,"evidence":[{"url":"https://blog.talosintelligence.com/2019/04/seaturtle.html","date":"2019-04-17"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2022-03-03"},{"url":"https://www.cisco.com/c/en/us/support/docs/csa/cisco-sa-20170629-snmp.html","date":"2023-04-17"}],"evidenceTotal":3,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-119","name":"Improper Restriction of Operations within the Bounds of a Memory Buffer"}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170629-snmp","tags":["Vendor Advisory"]},{"url":"http://www.securityfocus.com/bid/99345","tags":["Broken Link","Third Party Advisory","VDB Entry"]},{"url":"http://www.securitytracker.com/id/1038808","tags":["Broken Link","Third Party Advisory","VDB Entry"]},{"url":"https://github.com/artkond/cisco-snmp-rce","tags":["Exploit"]},{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170629-snmp","tags":["Vendor Advisory"]},{"url":"https://www.exploit-db.com/exploits/43450/","tags":["Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-6736","tags":["US Government Resource"]}],"techniques":[{"id":"T1078","name":"Valid Accounts","tactics":["initial-access","persistence","privilege-escalation","stealth"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Requires valid SNMP community string or credentials","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"the attacker must know the SNMP read-only community string for the affected system","start":719,"end":801}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Buffer overflow yields arbitrary code execution","mappingType":"primary_impact","evidence":[{"from":"description","quote":"could allow the attacker to execute arbitrary code and obtain full control","start":942,"end":1016}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1499.004","name":"Application or System Exploitation","tactics":["impact"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Crafted packet causes device reload, denial of service","mappingType":"primary_impact","evidence":[{"from":"description","quote":"or cause the affected system to reload","start":1040,"end":1078}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[{"id":"SRC-65ab06ae92274f14e50e","title":"DNS Hijacking Abuses Trust In Core Internet Service","publisher":"blog.talosintelligence.com","url":"https://blog.talosintelligence.com/seaturtle/","date":"2019-04-17","mentions":[{"quote":"CVE-2017-6736: Remote Code Exploit (RCE) for Cisco integrated Service Router 2811","start":8820,"end":8901},{"quote":"the Shellshock CVEs)SID: 31975 - 31978, 31985, 32038, 32039, 32041 - 32043, 32069, 32335, 32336CVE-2017-3881: RCE for Cisco switchesSID: 41909 - 41910CVE-2017-6736: Remote Code Exploit (RCE) for Cisco integrated Service Router 2811SID: 43424 - 43432CVE-2017-12617: RCE affecting Apache web servers running TomcatSID:","start":20184,"end":20500}]}],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2017-15790","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2017-15790","exploited":true,"exploitedSince":"2022-03-03","provenance":"source"},"exploits":[{"id":43450,"url":"https://www.exploit-db.com/exploits/43450","title":"Cisco IOS - Remote Code Execution","type":"remote","platform":"hardware","date":"2018-01-05","verified":false,"provenance":"source"}],"exploitSources":{"exploitdb":{"count":1,"earliest":"2018-01-05"},"pocGithub":{"count":3,"skipped":0,"earliest":"2018-03-01","earliestUrl":"https://github.com/msztankowski/CiscoIOSSNMPToolkit","repos":[{"name":"msztankowski/CiscoIOSSNMPToolkit","url":"https://github.com/msztankowski/CiscoIOSSNMPToolkit","stars":0,"created":"2018-03-01"},{"name":"plyrthn/CiscoIOSSNMPToolkit","url":"https://github.com/plyrthn/CiscoIOSSNMPToolkit","stars":0,"created":"2026-02-11"},{"name":"plyrthn/CiscoSpectreTakeover","url":"https://github.com/plyrthn/CiscoSpectreTakeover","stars":0,"created":"2026-02-11"}]},"first":{"date":"2018-01-05","source":"Exploit-DB","url":"https://www.exploit-db.com/exploits/43450"},"provenance":"source"},"exploitRefs":["https://github.com/artkond/cisco-snmp-rce","https://www.exploit-db.com/exploits/43450/"],"flow":[{"stage":"exploitation","techniques":["T1078"],"provenance":"ai"},{"stage":"primary","techniques":["T1059","T1499.004"],"provenance":"ai"}],"timeline":[{"date":"2017-07-17","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-6736","provenance":"source"},{"date":"2018-01-05","kind":"exploit-public","label":"First public exploit: Exploit-DB (EDB-43450); later: PoC-in-GitHub 2018-03-01","url":"https://www.exploit-db.com/exploits/43450","provenance":"source"},{"date":"2019-04-17","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://blog.talosintelligence.com/2019/04/seaturtle.html","provenance":"source"},{"date":"2019-04-17","kind":"report","label":"Named in blog.talosintelligence.com: DNS Hijacking Abuses Trust In Core Internet Service","url":"https://blog.talosintelligence.com/seaturtle/","provenance":"machine"},{"date":"2022-03-03","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2022-03-03","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2017-15790","provenance":"source"}],"speed":{"daysToPublicExploit":172,"firstExploitFrom":"Exploit-DB","daysToKev":1690},"priority":{"score":72.9,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 2752 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.88,"detail":"percentile 0.9938"},{"name":"Named in threat reports","points":3.87,"detail":"1 report"},{"name":"Public exploit code","points":5.0,"detail":"2 NVD references tagged Exploit; 1 Exploit-DB entry; 3 PoC-in-GitHub repos"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":6.16,"detail":"base score 8.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}