{"id":"CVE-2017-6737","kind":"vulnerability","aliases":["CVE-2017-6737"],"related":[],"title":"Cisco IOS and IOS XE Software: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability","description":"A vulnerability in the SNMP implementation of could allow an authenticated, remote attacker to cause a reload of the affected system or to remotely execute code. An attacker could exploit this vulnerability by sending a crafted SNMP packet to the affected device. \r\n\r\n\r\n\r\nThe vulnerability is due to a buffer overflow in the affected code area. The vulnerability affects all versions of SNMP (versions 1, 2c, and 3). The attacker must know the SNMP read only community string (SNMP version 2c or earlier) or the user credentials (SNMPv3). An exploit could allow the attacker to execute arbitrary code and obtain full control of the system or to cause a reload of the affected system.\r\n\r\n\r\n\r\nOnly traffic directed to the affected system can be used to exploit this vulnerability.","summary":"Cisco IOS and IOS XE contain a flaw in the SNMP subsystem that lets an authenticated remote attacker execute code on the device. CISA lists it as actively exploited in the wild.","severity":"critical","cvss":9.0,"epss":0.4524,"exploited":true,"exploited_at":"2022-03-03T00:00:00+00:00","products":[{"name":"Cisco IOS and IOS XE Software","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["cisco","exploited","infrastructure","ios","ios-xe","network-gear","snmp"],"not_affected_if":["non-cisco-devices","snmp-disabled"],"how_to_check":"Run 'show version' on the device to get the IOS or IOS XE release, then compare it against the fixed releases in the Cisco advisory. Check whether SNMP is enabled with 'show running-config | include snmp'.","fix":"Upgrade IOS or IOS XE to a fixed release per the Cisco security advisory. Restrict SNMP community access and rotate SNMP community strings.","status":"open","published_at":"2017-07-17T21:29:00+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:24:15+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T21:24:15Z","model":"claude-haiku-5-5","output":{"fix":"Upgrade IOS or IOS XE to a fixed release per the Cisco security advisory. Restrict SNMP community access and rotate SNMP community strings.","reach":"network","impact":"high","summary":"Cisco IOS and IOS XE contain a flaw in the SNMP subsystem that lets an authenticated remote attacker execute code on the device. CISA lists it as actively exploited in the wild.","category":"infrastructure","who_cares":["cisco","ios","ios-xe","network-gear","snmp"],"confidence":0.6,"needs_auth":"yes","worst_case":"Attacker runs code on the router or switch with valid SNMP credentials.","analyst_note":"Fixed-version list and SNMP access conditions are not in the sources; check the Cisco advisory for CVE-2017-6737 and the CISA KEV entry.","how_to_check":"Run 'show version' on the device to get the IOS or IOS XE release, then compare it against the fixed releases in the Cisco advisory. Check whether SNMP is enabled with 'show running-config | include snmp'.","needs_analyst":true,"not_affected_if":["snmp-disabled","non-cisco-devices"],"user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"high"},"cost_usd":0.000509,"input_tokens":2870,"output_tokens":445,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2017':19A,22A '-6737':20A,23A '1':136C '2c':137C,152C '3':139C 'activ':68B 'affect':92C,113C,125C,130C,184C,191C 'allow':81C,163C 'and':26A 'arbitrari':168C 'area':127C 'attack':58B,85C,100C,141C,165C 'authent':56B,83C 'buffer':121C 'caus':87C,179C 'cisa':64B 'cisco':1A,7A,24A,30B,41B 'code':15A,60B,98C,126C,169C 'communiti':148C 'contain':46B 'control':173C 'could':80C,101C,162C 'craft':108C 'credenti':158C 'cve':18A,21A 'devic':63B,114C 'direct':188C 'due':118C 'earlier':154C 'execut':16A,59B,97C,167C 'exploit':31B,69B,102C,161C,197C 'flaw':48B 'full':172C 'gear':39B 'implement':78C 'infrastructur':32B 'io':2A,4A,8A,10A,33B,35B,42B,44B 'ios':25A,27A 'ios-x':34B 'know':143C 'let':54B 'list':65B 'must':142C 'network':38B 'network-gear':37B 'obtain':171C 'overflow':122C 'packet':110C 'read':146C 'reload':89C,181C 'remot':14A,57B,84C,96C 'send':106C 'snmp':13A,40B,51B,77C,109C,134C,145C,150C 'snmpv3':159C 'softwar':6A,12A 'software':29A 'string':149C 'subsystem':52B 'system':93C,176C,185C,192C 'traffic':187C 'use':195C 'user':157C 'version':132C,135C,151C 'vulner':17A,74C,104C,116C,129C,199C 'wild':72B 'xe':5A,11A,28A,36B,45B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2017-07-17T21:29:00+00:00","kev":{"dateAdded":"2022-03-03","dueDate":"2022-03-24","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2017-6737","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2017-6737","severity":null,"published_at":"2022-03-03T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:52+00:00","fetched_at":"2026-10-25T17:39:58+00:00","note":null},{"source":"epss","external_id":"CVE-2017-6737","url":"https://api.first.org/data/v1/epss?cve=CVE-2017-6737","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:44+00:00","fetched_at":"2026-10-23T19:13:44+00:00","note":null},{"source":"nvd","external_id":"CVE-2017-6737","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-6737","severity":null,"published_at":"2017-07-17T21:29:00+00:00","modified_at":"2026-06-17T01:22:54+00:00","first_seen_at":"2026-10-23T21:57:35+00:00","fetched_at":"2026-10-23T21:57:35+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}