{"schemaVersion":3,"id":"CVE-2019-1849","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"A vulnerability in the Border Gateway Patrol (BGP) Multiprotocol Label Switching (MPLS)-based Ethernet VPN (EVPN) implementation of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to trigger a denial of service (DoS) condition on an affected device. The vulnerability is due to a logic error that occurs when the affected software processes specific EVPN routing information. An attacker could exploit this vulnerability by injecting malicious traffic patterns into the targeted EVPN network. A successful exploit could result in a crash of the l2vpn_mgr process on Provider Edge (PE) device members of the same EVPN instance (EVI). On each of the affected devices, a crash could lead to system instability and the inability to process or forward traffic through the device, resulting in a DoS condition that would require manual intervention to restore normal operating conditions.","dates":{"published":"2019-05-16T01:20:41.653Z","modified":"2024-11-21T19:23:53.261Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.4,"severity":"high","version":"3.0","versionLabel":"v3.0","source":"CVE.org","vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.0","versionLabel":"v3.0","source":"CVE.org","score":7.4,"severity":"high","vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"NVD","score":6.5,"severity":"medium","vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":6.1,"severity":"medium","vector":"AV:A/AC:L/Au:N/C:N/I:N/A:C","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00646,"percentile":0.50258,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0.03499999999999996,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.00611},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00646,"percentile":0.50258}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00646,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00646,"percentile":0.50258}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":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-754","name":"Improper Check for Unusual or Exceptional Conditions","description":"The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.","type":"weakness","status":"Incomplete","abstraction":"Class","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/754.html"}],"affected":[{"vendor":"cisco","product":"cisco ios xr software","name":"Cisco IOS XR Software","label":"cisco ios xr software","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < n/a","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < n/a","eol":null,"hubHref":"/vendor/cisco/cisco_ios_xr_software"},{"vendor":"cisco","product":"ios_xr","name":"IOS XR","label":"ios_xr","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 6.1.0, < 6.3.3","noFixRecorded":false,"fixedIn":null},{"text":"≥ 6.4.0, < 6.4.2","noFixRecorded":false,"fixedIn":null},{"text":"≥ 6.5.0, < 6.5.2","noFixRecorded":false,"fixedIn":null},{"text":"≥ 6.6.0, < 6.6.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.1.0, < 6.3.3 | ≥ 6.4.0, < 6.4.2 | ≥ 6.5.0, < 6.5.2 | ≥ 6.6.0, < 6.6.1","eol":null,"hubHref":"/vendor/cisco/ios_xr"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-iosxr-evpn-dos","label":"tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-iosxr-evpn-dos","hostname":"tools.cisco.com","tags":["Vendor Advisory","X Refsource CISCO"]},{"url":"http://www.securityfocus.com/bid/108342","label":"www.securityfocus.com/bid/108342","hostname":"www.securityfocus.com","tags":["VDB Entry","X Refsource BID","Third Party Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2019-05-16T01:20:41.653Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-11-21T19:23:53.261Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T07:24:24.177Z","stale":false,"partial":false}}