{"items":[{"id":"NVI-00001176","kind":"vulnerability","title":"CVE-2018-0173","revision":4,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","CISA catalog date-added and due-date fields are not the original vulnerability disclosure date or universal legal deadlines.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["CVE-2018-0173"],"plain_summary":"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.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-0766dd36e04be795ac4d8665c1cdd763"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"Apply updates per vendor instructions.","source_ids":["sr-aad3ae6631632956d56f515b066fe1b4"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-01-12T22:00:15.918Z","value":"8.6 HIGH (3.1)","meaning":"CISA-ADP severity and vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H; not a measure of customer compromise.","source_id":"sr-0af7d75221ce41a075000edea044d9da"},{"kind":"CISA_KEV","as_of":"2022-03-03T00:00:00.000Z","value":"Listed","meaning":"CISA lists known exploitation. 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Missing scores are unknown.","source_id":"sr-0766dd36e04be795ac4d8665c1cdd763"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-0af7d75221ce41a075000edea044d9da","url":"https://www.cve.org/CVERecord?id=CVE-2018-0173","basis":"cna_record","notes":"CVE content: copyright The MITRE Corporation; CVE Terms of Use and license apply. CNA and ADP publishers retain separate attribution.","title":"CVE-2018-0173","publisher":"CVE Program / attributed CNA and ADP","observed_at":"2026-11-08T08:05:01.225Z"},{"id":"sr-aad3ae6631632956d56f515b066fe1b4","url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","basis":"official_catalog","notes":"CISA KEV; CC0 1.0. Catalog assertions are not evidence of customer compromise.","title":"CVE-2018-0173","publisher":"CISA","observed_at":"2026-10-31T20:54:12.600Z"},{"id":"sr-36d5ffa1fbc32bf1e4ffa25f5c0cfab8","url":"https://nvd.nist.gov/vuln/detail/CVE-2018-0173","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2018-0173","publisher":"NIST National Vulnerability Database","observed_at":"2026-10-31T21:42:03.347Z"},{"id":"sr-0766dd36e04be795ac4d8665c1cdd763","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2018-0173","publisher":"FIRST EPSS","observed_at":"2026-10-31T21:41:13.231Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-0af7d75221ce41a075000edea044d9da"],"technology":"Cisco IOS and IOS XE","known_exclusions":[],"conditions_summary":"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.","public_affected_ranges":["Cisco IOS and IOS XE"]},{"certainty":"source_listed","source_ids":["sr-aad3ae6631632956d56f515b066fe1b4"],"technology":"Cisco IOS and IOS XE Software","known_exclusions":[],"conditions_summary":"CISA does not supply a complete application-specific affected range here. Follow the linked vendor advisory for version and configuration prerequisites.","public_affected_ranges":[]}],"null_published_at":"2026-11-08T08:10:35.856Z","source_updated_at":"2026-01-12T22:00:15.918Z","source_disclosed_at":"2018-03-28T22:00:00.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T20:54:12.600Z"},{"id":"NVI-00001176","kind":"vulnerability","title":"Cisco IOS and IOS XE Software Improper Input Validation Vulnerability","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","CISA catalog date-added and due-date fields are not the original vulnerability disclosure date or universal legal deadlines.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["CVE-2018-0173"],"plain_summary":"CISA lists CVE-2018-0173 in its Known Exploited Vulnerabilities catalog. The catalog names Cisco IOS and IOS XE Software; it does not establish that a particular visitor is exposed or compromised.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Apply updates per vendor instructions.","source_ids":["sr-aad3ae6631632956d56f515b066fe1b4"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-0766dd36e04be795ac4d8665c1cdd763"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CISA_KEV","as_of":"2022-03-03T00:00:00.000Z","value":"Listed","meaning":"CISA lists known exploitation. 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Catalog assertions are not evidence of customer compromise.","title":"CVE-2018-0173","publisher":"CISA","observed_at":"2026-10-31T20:54:12.600Z"},{"id":"sr-36d5ffa1fbc32bf1e4ffa25f5c0cfab8","url":"https://nvd.nist.gov/vuln/detail/CVE-2018-0173","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2018-0173","publisher":"NIST National Vulnerability Database","observed_at":"2026-10-31T21:42:03.347Z"},{"id":"sr-0766dd36e04be795ac4d8665c1cdd763","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2018-0173","publisher":"FIRST EPSS","observed_at":"2026-10-31T21:41:13.231Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-aad3ae6631632956d56f515b066fe1b4"],"technology":"Cisco IOS and IOS XE Software","known_exclusions":[],"conditions_summary":"CISA does not supply a complete application-specific affected range here. Follow the linked vendor advisory for version and configuration prerequisites.","public_affected_ranges":[]}],"null_published_at":"2026-10-31T21:53:28.046Z","source_updated_at":"2022-03-03T00:00:00.000Z","source_disclosed_at":null,"is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T20:54:12.600Z"},{"id":"NVI-00001176","kind":"vulnerability","title":"Cisco IOS and IOS XE Software Improper Input Validation Vulnerability","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","CISA catalog date-added and due-date fields are not the original vulnerability disclosure date or universal legal deadlines."],"lifecycle":"active","identifiers":["CVE-2018-0173"],"plain_summary":"CISA lists CVE-2018-0173 in its Known Exploited Vulnerabilities catalog. The catalog names Cisco IOS and IOS XE Software; it does not establish that a particular visitor is exposed or compromised.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Apply updates per vendor instructions.","source_ids":["sr-aad3ae6631632956d56f515b066fe1b4"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CISA_KEV","as_of":"2022-03-03T00:00:00.000Z","value":"Listed","meaning":"CISA lists known exploitation. This does not establish exploitation of your system.","source_id":"sr-aad3ae6631632956d56f515b066fe1b4"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-aad3ae6631632956d56f515b066fe1b4","url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","basis":"official_catalog","notes":"CISA KEV; CC0 1.0. Catalog assertions are not evidence of customer compromise.","title":"CVE-2018-0173","publisher":"CISA","observed_at":"2026-10-31T20:54:12.600Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-aad3ae6631632956d56f515b066fe1b4"],"technology":"Cisco IOS and IOS XE Software","known_exclusions":[],"conditions_summary":"CISA does not supply a complete application-specific affected range here. Follow the linked vendor advisory for version and configuration prerequisites.","public_affected_ranges":[]}],"null_published_at":"2026-10-31T21:40:39.197Z","source_updated_at":"2022-03-03T00:00:00.000Z","source_disclosed_at":null,"is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T20:54:12.600Z"}],"next_cursor":null,"snapshot_revision":"39771"}