{"id":"CVE-2026-57029","state":"PUBLISHED","title":"Junos OS Evolved: QFX Series: When sFlow collector reachability changes evo-pfemand process can crash","description":"A Missing Synchronization vulnerability in the flow collector handler of Juniper Networks Junos OS Evolved on QFX Series allows an adjacent, unauthenticated attacker to cause a Denial-of-Service (DoS).\n\n\nWhen the reachability of an sFlow collector changes, the corresponding next-hop entry is updated. If this update occurs simultaneously with the sFlow thread accessing the next-hop data (which is outside the attackers control), it causes the evo-pfemand process to crash, impacting all traffic forwarding until the automatic process restart has completed.\n\n\n\n\nThis issue affects Junos OS Evolved on QFX Series:\n\n\n  *  all 23.2 versions, \n  *  23.4 versions before 23.4R2-S7-EVO,\n  *  24.2 versions before 24.2R2-S5-EVO,\n  *  24.4 versions before 24.4R2-S3-EVO,\n  *  25.2 versions before 25.2R2-EVO.","publishedAt":"2026-07-09T21:12:36.288Z","updatedAt":"2026-07-10T14:45:20.380Z","severity":{"score":6,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/RE:M","source":"juniper"},"assigner":"juniper","products":["Juniper Networks Junos OS Evolved"],"affected":[{"vendor":"Juniper Networks","product":"Junos OS Evolved","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"23.4R2-S7-EVO","versionType":"custom"},{"version":"24.2","status":"affected","lessThan":"24.2R2-S5-EVO","versionType":"custom"},{"version":"24.4","status":"affected","lessThan":"24.4R2-S3-EVO","versionType":"custom"},{"version":"25.2","status":"affected","lessThan":"25.2R2-EVO","versionType":"custom"}],"platforms":["QFX Series"]}],"references":["https://supportportal.juniper.net/JSA110089"],"weaknesses":["CWE-820"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/57xxx/CVE-2026-57029.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-57029","state":"PUBLISHED","datePublished":"2026-07-09T21:12:36.288Z","dateUpdated":"2026-07-10T14:45:20.380Z","assignerShortName":"juniper","assignerOrgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968","dateReserved":"2026-06-23T16:27:00.249Z"},"containers":{"cna":{"title":"Junos OS Evolved: QFX Series: When sFlow collector reachability changes evo-pfemand process can crash","descriptions":[{"lang":"en","value":"A Missing Synchronization vulnerability in the flow collector handler of Juniper Networks Junos OS Evolved on QFX Series allows an adjacent, unauthenticated attacker to cause a Denial-of-Service (DoS).\n\n\nWhen the reachability of an sFlow collector changes, the corresponding next-hop entry is updated. If this update occurs simultaneously with the sFlow thread accessing the next-hop data (which is outside the attackers control), it causes the evo-pfemand process to crash, impacting all traffic forwarding until the automatic process restart has completed.\n\n\n\n\nThis issue affects Junos OS Evolved on QFX Series:\n\n\n  *  all 23.2 versions, \n  *  23.4 versions before 23.4R2-S7-EVO,\n  *  24.2 versions before 24.2R2-S5-EVO,\n  *  24.4 versions before 24.4R2-S3-EVO,\n  *  25.2 versions before 25.2R2-EVO."}],"affected":[{"vendor":"Juniper Networks","product":"Junos OS Evolved","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"23.4R2-S7-EVO","versionType":"custom"},{"version":"24.2","status":"affected","lessThan":"24.2R2-S5-EVO","versionType":"custom"},{"version":"24.4","status":"affected","lessThan":"24.4R2-S3-EVO","versionType":"custom"},{"version":"25.2","status":"affected","lessThan":"25.2R2-EVO","versionType":"custom"}],"platforms":["QFX Series"]}],"references":[{"url":"https://supportportal.juniper.net/JSA110089","tags":["vendor-advisory"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:H/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":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"ADJACENT","baseScore":6,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/RE:M","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"MODERATE"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-820","description":"CWE-820 Missing Synchronization","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"juniper","orgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968","dateUpdated":"2026-07-09T21:12:36.288Z"},"configurations":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"To be exposed to this issue at least one sflow collector needs to be configured via:<br><br><tt>[ protocols&nbsp;sflow collector &lt;address&gt;&nbsp;<span style=\"background-color: rgb(255, 255, 255);\">]</span></tt>\n\n<br>"}],"value":"To be exposed to this issue at least one sflow collector needs to be configured via:\n\n[ protocols sflow collector <address> ]"}],"datePublic":"2026-07-08T16:00:00.000Z","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 this specific issue:\n\nJunos OS Evolved: 23.4R2-S7-EVO, 24.2R2-S5-EVO, 24.4R2-S3-EVO, 25.2R2-EVO, 25.4R1-EVO, and all subsequent releases."}],"value":"The following software releases have been updated to resolve this specific issue:\n\nJunos OS Evolved: 23.4R2-S7-EVO, 24.2R2-S5-EVO, 24.4R2-S3-EVO, 25.2R2-EVO, 25.4R1-EVO, and all subsequent releases."}],"source":{"advisory":"JSA110089","defect":["1909536"],"discovery":"USER"},"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":"2026-07-10T14:44:51.065414Z","id":"CVE-2026-57029","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":"2026-07-10T14:45:20.380Z"}}]}}}