{"schemaVersion":3,"id":"CVE-2017-6740","aliases":[],"status":"published","duplicateOf":null,"title":"Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability","description":"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.\n\n 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.\n\n 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.\n\n   There are workarounds that address these vulnerabilities.","dates":{"published":"2017-07-17T21:00:00.000Z","modified":"2025-10-21T23:55:37.237Z","reserved":null,"kevAdded":["2022-03-03T00:00:00.000Z"],"kevDue":["2022-03-24T00:00:00.000Z"]},"cvss":{"headline":{"score":9,"severity":"high","version":"2.0","versionLabel":"v2.0","source":"NVD","vector":"AV:N/AC:L/Au:S/C:C/I:C/A:C","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.0","versionLabel":"v3.0","source":"CVE.org","score":8.8,"severity":"high","vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8.8,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"NVD","score":8.8,"severity":"high","vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":9,"severity":"high","vector":"AV:N/AC:L/Au:S/C:C/I:C/A:C","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.111,"percentile":0.95895,"severity":"medium","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.111},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.10895,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.10895,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.10895,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.111,"percentile":0.95895}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.111,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.111,"percentile":0.95895}]},"kev":{"state":"listed","entries":[{"source":"cisa","sourceLabel":"CISA","dateAdded":"2022-03-03T00:00:00.000Z","dueDate":"2022-03-24T00:00:00.000Z","requiredAction":"Apply updates per vendor instructions.","name":"Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability","description":"The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE contains a vulnerability that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload.","notes":[{"type":"url","href":"https://nvd.nist.gov/vuln/detail/CVE-2017-6740","label":"nvd.nist.gov/vuln/detail/CVE-2017-6740"}],"vendor":"Cisco","product":"IOS and IOS XE Software","ransomware":false,"ransomwareUse":"Unknown","exploitationType":null}],"listedCount":1,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":true,"entry":{"source":"cisa","sourceLabel":"CISA","dateAdded":"2022-03-03T00:00:00.000Z","dueDate":"2022-03-24T00:00:00.000Z","requiredAction":"Apply updates per vendor instructions.","name":"Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability","description":"The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE contains a vulnerability that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload.","notes":[{"type":"url","href":"https://nvd.nist.gov/vuln/detail/CVE-2017-6740","label":"nvd.nist.gov/vuln/detail/CVE-2017-6740"}],"vendor":"Cisco","product":"IOS and IOS XE Software","ransomware":false,"ransomwareUse":"Unknown","exploitationType":null}},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-119","name":"Improper Restriction of Operations within the Bounds of a Memory Buffer","description":"The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.","type":"weakness","status":"Stable","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/119.html"}],"affected":[{"vendor":"cisco","product":"ios","name":"ios","label":"ios","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"12.2(14)ZA","noFixRecorded":false,"fixedIn":null},{"text":"12.2(14)ZA3","noFixRecorded":false,"fixedIn":null},{"text":"12.2(14)ZA2","noFixRecorded":false,"fixedIn":null},{"text":"12.2(14)ZA5","noFixRecorded":false,"fixedIn":null},{"text":"12.2(14)ZA4","noFixRecorded":false,"fixedIn":null},{"text":"12.2(14)ZA6","noFixRecorded":false,"fixedIn":null},{"text":"12.2(14)ZA7","noFixRecorded":false,"fixedIn":null},{"text":"12.2(25)SE2","noFixRecorded":false,"fixedIn":null},{"text":"12.2(29)SV2","noFixRecorded":false,"fixedIn":null},{"text":"12.2(17d)SXB6","noFixRecorded":false,"fixedIn":null},{"text":"12.2(17d)SXB11","noFixRecorded":false,"fixedIn":null},{"text":"12.2(17d)SXB7","noFixRecorded":false,"fixedIn":null},{"text":"12.2(17d)SXB4","noFixRecorded":false,"fixedIn":null},{"text":"12.2(17d)SXB2","noFixRecorded":false,"fixedIn":null},{"text":"12.2(17d)SXB3","noFixRecorded":false,"fixedIn":null},{"text":"12.2(17d)SXB5","noFixRecorded":false,"fixedIn":null},{"text":"12.2(17d)SXB10","noFixRecorded":false,"fixedIn":null},{"text":"12.2(17d)SXB8","noFixRecorded":false,"fixedIn":null},{"text":"12.2(17d)SXB11a","noFixRecorded":false,"fixedIn":null},{"text":"12.2(17d)SXB1","noFixRecorded":false,"fixedIn":null},{"text":"12.2(17d)SXB9","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SO1","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SO3","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SO2","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF5","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF6","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF15","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF10","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF17b","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF4","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF15a","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF3","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF17","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF12","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF8","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF10a","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF16","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF7","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF17a","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF14","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF12a","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF9","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF13","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF2","noFixRecorded":false,"fixedIn":null},{"text":"12.2(18)SXF11","noFixRecorded":false,"fixedIn":null},{"text":"12.2(28)ZX","noFixRecorded":false,"fixedIn":null},{"text":"12.2(33)STE0","noFixRecorded":false,"fixedIn":null},{"text":"15.0(1)XO1","noFixRecorded":false,"fixedIn":null},{"text":"15.0(1)XO","noFixRecorded":false,"fixedIn":null},{"text":"15.0(2)XO","noFixRecorded":false,"fixedIn":null},{"text":"15.0(2)SG11a","noFixRecorded":false,"fixedIn":null},{"text":"15.0(1)EX","noFixRecorded":false,"fixedIn":null},{"text":"15.0(2)EX2","noFixRecorded":false,"fixedIn":null},{"text":"15.0(2)EX8","noFixRecorded":false,"fixedIn":null},{"text":"15.0(2)EX10","noFixRecorded":false,"fixedIn":null},{"text":"15.0(2)EX11","noFixRecorded":false,"fixedIn":null},{"text":"15.0(2)EX13","noFixRecorded":false,"fixedIn":null},{"text":"15.0(2)EX12","noFixRecorded":false,"fixedIn":null},{"text":"15.1(2)SY9","noFixRecorded":false,"fixedIn":null},{"text":"15.1(3)MRA3","noFixRecorded":false,"fixedIn":null},{"text":"15.1(3)MRA4","noFixRecorded":false,"fixedIn":null},{"text":"15.1(3)SVB1","noFixRecorded":false,"fixedIn":null},{"text":"15.1(3)SVB2","noFixRecorded":false,"fixedIn":null},{"text":"15.1(3)SVD","noFixRecorded":false,"fixedIn":null},{"text":"15.1(3)SVD1","noFixRecorded":false,"fixedIn":null},{"text":"15.1(3)SVD2","noFixRecorded":false,"fixedIn":null},{"text":"15.1(3)SVF","noFixRecorded":false,"fixedIn":null},{"text":"15.1(3)SVF1","noFixRecorded":false,"fixedIn":null},{"text":"15.1(3)SVE","noFixRecorded":false,"fixedIn":null},{"text":"15.1(3)SVG","noFixRecorded":false,"fixedIn":null},{"text":"15.1(3)SVJ2","noFixRecorded":false,"fixedIn":null},{"text":"≥ 12.0, ≤ 12.4","noFixRecorded":false,"fixedIn":null},{"text":"≥ 15.0, ≤ 15.6","noFixRecorded":false,"fixedIn":null}],"versionsText":"12.2(14)ZA | 12.2(14)ZA3 | 12.2(14)ZA2 | 12.2(14)ZA5 | 12.2(14)ZA4 | 12.2(14)ZA6 | 12.2(14)ZA7 | 12.2(25)SE2 | 12.2(29)SV2 | 12.2(17d)SXB6 | 12.2(17d)SXB11 | 12.2(17d)SXB7 | 12.2(17d)SXB4 | 12.2(17d)SXB2 | 12.2(17d)SXB3 | 12.2(17d)SXB5 | 12.2(17d)SXB10 | 12.2(17d)SXB8 | 12.2(17d)SXB11a | 12.2(17d)SXB1 | 12.2(17d)SXB9 | 12.2(18)SO1 | 12.2(18)SO3 | 12.2(18)SO2 | 12.2(18)SXF | 12.2(18)SXF5 | 12.2(18)SXF6 | 12.2(18)SXF15 | 12.2(18)SXF10 | 12.2(18)SXF17b | 12.2(18)SXF4 | 12.2(18)SXF15a | 12.2(18)SXF3 | 12.2(18)SXF17 | 12.2(18)SXF12 | 12.2(18)SXF8 | 12.2(18)SXF10a | 12.2(18)SXF16 | 12.2(18)SXF7 | 12.2(18)SXF17a | 12.2(18)SXF14 | 12.2(18)SXF12a | 12.2(18)SXF9 | 12.2(18)SXF13 | 12.2(18)SXF2 | 12.2(18)SXF11 | 12.2(28)ZX | 12.2(33)STE0 | 15.0(1)XO1 | 15.0(1)XO | 15.0(2)XO | 15.0(2)SG11a | 15.0(1)EX | 15.0(2)EX2 | 15.0(2)EX8 | 15.0(2)EX10 | 15.0(2)EX11 | 15.0(2)EX13 | 15.0(2)EX12 | 15.1(2)SY9 | 15.1(3)MRA3 | 15.1(3)MRA4 | 15.1(3)SVB1 | 15.1(3)SVB2 | 15.1(3)SVD | 15.1(3)SVD1 | 15.1(3)SVD2 | 15.1(3)SVF | 15.1(3)SVF1 | 15.1(3)SVE | 15.1(3)SVG | 15.1(3)SVJ2 | ≥ 12.0, ≤ 12.4 | ≥ 15.0, ≤ 15.6","eol":null,"hubHref":"/vendor/cisco/ios"},{"vendor":"cisco","product":"ios_xe","name":"ios xe","label":"ios_xe","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 2.2.0, ≤ 3.17","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 2.2.0, ≤ 3.17","eol":null,"hubHref":"/vendor/cisco/ios_xe"},{"vendor":"intellishield","product":"universal product","name":"Universal Product","label":"universal product","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"N/A","noFixRecorded":false,"fixedIn":null}],"versionsText":"N/A","eol":null,"hubHref":"/vendor/intellishield/universal_product"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170629-snmp","label":"sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170629-snmp","hostname":"sec.cloudapps.cisco.com","tags":["US Government Resource"]},{"url":"http://www.securityfocus.com/bid/99345","label":"www.securityfocus.com/bid/99345","hostname":"www.securityfocus.com","tags":["VDB Entry","X Refsource BID","X Transferred","Broken Link","Third Party Advisory"]},{"url":"http://www.securitytracker.com/id/1038808","label":"www.securitytracker.com/id/1038808","hostname":"www.securitytracker.com","tags":["VDB Entry","X Refsource SECTRACK","X Transferred","Broken Link","Third Party Advisory"]},{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170629-snmp","label":"tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170629-snmp","hostname":"tools.cisco.com","tags":["X Refsource CONFIRM","X Transferred","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-6740","label":"www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-6740","hostname":"www.cisa.gov","tags":["Government Resource","US Government Resource"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2017-07-17T21:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"kev-added","date":"2022-03-03T00:00:00.000Z","label":"Added to CISA KEV","detail":"Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability","source":"cisa"},{"kind":"kev-due","date":"2022-03-24T00:00:00.000Z","label":"CISA remediation due","detail":"Apply updates per vendor instructions.","source":"cisa"},{"kind":"modified","date":"2025-10-21T23:55:37.237Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":85,"level":"critical","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T04:16:39.333Z","stale":false,"partial":false}}