{"id":"CVE-2025-52952","state":"PUBLISHED","title":"Junos OS: MX Series with MPC-BUILTIN, MPC 1 through MPC 9: Receipt and processing of a malformed packet causes one or more FPCs to crash","description":"An Out-of-bounds Write vulnerability in the connectivity fault management (CFM) daemon of Juniper Networks Junos OS on MX Series with MPC-BUILTIN, MPC1 through MPC9 line cards allows an unauthenticated adjacent attacker to send a malformed packet to the device, leading to an FPC crash and restart, resulting in a Denial of Service (DoS).\n\nContinued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.\n\nThis issue affects Juniper Networks:\nJunos OS:\n  *  All versions before 22.2R3-S1,\n  *  from 22.4 before 22.4R2.\n\n\nThis feature is not enabled by default.","publishedAt":"2025-07-11T15:04:35.691Z","updatedAt":"2025-07-11T20:10:52.673Z","severity":{"score":7.1,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Green","source":"juniper"},"assigner":"juniper","products":["Juniper Networks Junos OS"],"affected":[{"vendor":"Juniper Networks","product":"Junos OS","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"22.2R3-S1","versionType":"semver"},{"version":"22.4","status":"affected","lessThan":"22.4R2","versionType":"semver"}],"modules":["pfe ukern","cfmman","cfmd"],"platforms":["MX Series with MPC-BUILTIN","MPC1 through MPC9"]}],"references":["https://supportportal.juniper.net/JSA100058","https://www.juniper.net/documentation/us/en/software/junos/network-mgmt/topics/topic-map/cfm-configuring.html"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-29T20:09:31.862Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/52xxx/CVE-2025-52952.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2025-52952","state":"PUBLISHED","datePublished":"2025-07-11T15:04:35.691Z","dateUpdated":"2025-07-11T20:10:52.673Z","assignerShortName":"juniper","assignerOrgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968","dateReserved":"2025-06-23T13:16:01.409Z"},"containers":{"cna":{"title":"Junos OS: MX Series with MPC-BUILTIN, MPC 1 through MPC 9: Receipt and processing of a malformed packet causes one or more FPCs to crash","descriptions":[{"lang":"en","value":"An Out-of-bounds Write vulnerability in the connectivity fault management (CFM) daemon of Juniper Networks Junos OS on MX Series with MPC-BUILTIN, MPC1 through MPC9 line cards allows an unauthenticated adjacent attacker to send a malformed packet to the device, leading to an FPC crash and restart, resulting in a Denial of Service (DoS).\n\nContinued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.\n\nThis issue affects Juniper Networks:\nJunos OS:\n  *  All versions before 22.2R3-S1,\n  *  from 22.4 before 22.4R2.\n\n\nThis feature is not enabled by default."}],"affected":[{"vendor":"Juniper Networks","product":"Junos OS","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"22.2R3-S1","versionType":"semver"},{"version":"22.4","status":"affected","lessThan":"22.4R2","versionType":"semver"}],"modules":["pfe ukern","cfmman","cfmd"],"platforms":["MX Series with MPC-BUILTIN","MPC1 through MPC9"]}],"references":[{"url":"https://supportportal.juniper.net/JSA100058","tags":["vendor-advisory"]},{"url":"https://www.juniper.net/documentation/us/en/software/junos/network-mgmt/topics/topic-map/cfm-configuring.html","tags":["technical-description"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]},{"cvssV4_0":{"Automatable":"YES","Recovery":"AUTOMATIC","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"ADJACENT","baseScore":7.1,"baseSeverity":"HIGH","privilegesRequired":"NONE","providerUrgency":"GREEN","subAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"CONCENTRATED","vectorString":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Green","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"MODERATE"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","description":"CWE-787 Out-of-bounds Write","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"juniper","orgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968","dateUpdated":"2025-07-11T15:04:35.691Z"},"configurations":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"The following minimal configuration is necessary to be present to be potentially exposed to this issue:&nbsp;<br><tt>&nbsp; [protocols oam ethernet connectivity-fault-management enhanced-cfm-mode]</tt><br>"}],"value":"The following minimal configuration is necessary to be present to be potentially exposed to this issue: \n  [protocols oam ethernet connectivity-fault-management enhanced-cfm-mode]"}],"datePublic":"2025-07-09T16:00:00.000Z","exploits":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}],"value":"Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"The following software releases have been updated to resolve these issues:<br>Junos OS: 22.2R3-S1, 22.4R2,&nbsp;23.2R1, and all subsequent releases.<br>"}],"value":"The following software releases have been updated to resolve these issues:\nJunos OS: 22.2R3-S1, 22.4R2, 23.2R1, and all subsequent releases."}],"source":{"advisory":"JSA100058","defect":["1726141"],"discovery":"USER"},"timeline":[{"lang":"en","time":"2025-07-09T16:00:00.000Z","value":"Initial Publication"}],"workarounds":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"There are no known workarounds for this issue."}],"value":"There are no known workarounds for this issue."}],"x_generator":{"engine":"Vulnogram 0.1.0-dev"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-07-11T20:10:43.269996Z","id":"CVE-2025-52952","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-07-11T20:10:52.673Z"}}]}}}