{"affected":[{"defaultStatus":"unaffected","ecosystem":"github","packageName":"esnet/iperf","product":"iperf3","source":"CNA: VulnCheck","vendor":"esnet","versions":[{"lessThan":"3.22","status":"affected","version":"3.14","versionType":"custom"}]}],"cveId":"CVE-2026-102253","cwes":["CWE-835"],"description":"iperf3 versions prior to 3.22 contains a denial of service vulnerability that allows unauthenticated remote attackers to crash-loop the server's UDP receive worker into an unrecoverable infinite loop by sending a single crafted control-channel parameter message followed by one 16-byte UDP datagram. Attackers can permanently pin the affected per-stream receive thread at approximately 100% CPU usage, rendering the server unusable until forcibly killed with SIGKILL, as the process does not respond to normal control-channel closure.","epss":{"date":"2026-11-08","percentile":0.37526,"score":0.00431},"exploits":[],"kev":null,"metrics":[{"score":8.7,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},{"score":7.5,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1794146443205,"publishedAt":1790712707089,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory","patch","release-notes"],"url":"https://github.com/esnet/iperf/releases/tag/3.22"},{"source":"CNA: VulnCheck","tags":["release-notes"],"url":"https://github.com/esnet/iperf/blob/master/RELNOTES.md"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/iperf3-udp-receive-worker-infinite-loop-dos"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/esnet/iperf/releases/tag/3.22"}],"revision":"488d9f4603ce6a664c7af1d65ba26ca11a67c82294165f2db36f0d77bd994235","sources":[{"modifiedAt":1794146443205,"name":"CNA: VulnCheck","retrievedAt":1794147005199,"url":"https://www.cve.org/CVERecord?id=CVE-2026-102253"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794150617908,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-102253"}],"ssvc":{"assessedAt":1790796342477,"automatable":"yes","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"iperf3 < 3.22 UDP Receive Worker Infinite Loop DoS","updatedAt":1794150617908}