{"api_version":"1","generated_at":"2026-04-23T13:35:29+00:00","cve":"CVE-2018-0173","urls":{"html":"https://cve.report/CVE-2018-0173","api":"https://cve.report/api/cve/CVE-2018-0173.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2018-0173","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-0173"},"summary":{"title":"CVE-2018-0173","description":"A vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a Relay Reply denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of encapsulated option 82 information that it receives in DHCPOFFER messages from DHCPv4 servers. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device, which the device would then forward to a DHCPv4 server. When the affected software processes the option 82 information that is encapsulated in the response from the server, an error could occur. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCvg62754.","state":"PUBLIC","assigner":"psirt@cisco.com","published_at":"2018-03-28 22:29:00","updated_at":"2019-10-09 23:31:00"},"problem_types":["CWE-20"],"metrics":[],"references":[{"url":"https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04","name":"https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04","refsource":"MISC","tags":["Third Party Advisory","US Government Resource"],"title":"Rockwell Automation Stratix and ArmorStratix Switches | CISA","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05","name":"https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05","refsource":"MISC","tags":["Third Party Advisory","US Government Resource"],"title":"Rockwell Automation Stratix Industrial Managed Ethernet Switch | ICS-CERT","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"http://www.securitytracker.com/id/1040591","name":"1040591","refsource":"SECTRACK","tags":["Third Party Advisory","VDB Entry"],"title":"Cisco IOS/IOS XE DHCP Option 82 Processing Bugs Let Remote Users Cause the Target System to Reload - SecurityTracker","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr2","name":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr2","refsource":"CONFIRM","tags":["Vendor Advisory"],"title":"Cisco IOS and IOS XE Software DHCP Version 4 Relay Reply Denial of Service Vulnerability","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"http://www.securityfocus.com/bid/103545","name":"103545","refsource":"BID","tags":["Third Party Advisory","VDB Entry"],"title":"Cisco IOS and IOS XE Software CVE-2018-0173 Denial of Service Vulnerability","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"https://www.tenable.com/security/research/tra-2018-06","name":"https://www.tenable.com/security/research/tra-2018-06","refsource":"MISC","tags":["Third Party Advisory"],"title":"[R1] Cisco IOS and IOS XE Multiple Memory Corruption Vulnerabilities - Research Advisory | Tenable®","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-0173","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-0173","name":"NVD vulnerability 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and IOS XE Software","vulnerabilityName":"Cisco IOS and IOS XE Software Improper Input Validation Vulnerability","dateAdded":"2022-03-03","shortDescription":"A vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets can allow for denial-of-service (DoS).","requiredAction":"Apply updates per vendor instructions.","dueDate":"2022-03-17","knownRansomwareCampaignUse":"Unknown","notes":"https://nvd.nist.gov/vuln/detail/CVE-2018-0173","cwes":"CWE-20","catalogVersion":"2026.04.22","updated_at":"2026-04-22 20:03:10"},"epss":{"cve_year":"2018","cve_id":"173","cve":"CVE-2018-0173","epss":"0.054250000","percentile":"0.901850000","score_date":"2026-04-22","updated_at":"2026-04-23 00:03:16"},"legacy_qids":[{"cve":"CVE-2018-0173","qid":"590338","title":"Rockwell Automation Stratix and ArmorStratix Switches Multiple Vulnerabilities (ICSA-18-107-04)"},{"cve":"CVE-2018-0173","qid":"590339","title":"Rockwell Automation Stratix Industrial Managed Ethernet Switch Multiple Vulnerabilities (ICSA-18-107-05)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"psirt@cisco.com","ID":"CVE-2018-0173","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Cisco IOS and IOS XE","version":{"version_data":[{"version_value":"Cisco IOS and IOS XE"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"A vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a Relay Reply denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of encapsulated option 82 information that it receives in DHCPOFFER messages from DHCPv4 servers. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device, which the device would then forward to a DHCPv4 server. When the affected software processes the option 82 information that is encapsulated in the response from the server, an error could occur. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCvg62754."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-20"}]}]},"references":{"reference_data":[{"name":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr2","refsource":"CONFIRM","url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr2"},{"name":"103545","refsource":"BID","url":"http://www.securityfocus.com/bid/103545"},{"name":"https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04","refsource":"MISC","url":"https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04"},{"name":"https://www.tenable.com/security/research/tra-2018-06","refsource":"MISC","url":"https://www.tenable.com/security/research/tra-2018-06"},{"name":"1040591","refsource":"SECTRACK","url":"http://www.securitytracker.com/id/1040591"},{"name":"https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05","refsource":"MISC","url":"https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05"}]}},"nvd":{"publishedDate":"2018-03-28 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vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a Relay Reply denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of encapsulated option 82 information that it receives in DHCPOFFER messages from DHCPv4 servers. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device, which the device would then forward to a DHCPv4 server. When the affected software processes the option 82 information that is encapsulated in the response from the server, an error could occur. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCvg62754.","Type":"Description","Title":null},{"CveYear":"2018","CveId":"173","Ordinal":"2","NoteData":"2018-03-28","Type":"Other","Title":"Published"},{"CveYear":"2018","CveId":"173","Ordinal":"3","NoteData":"2018-04-19","Type":"Other","Title":"Modified"}]}}}