CVE-2026-102253
8.7
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
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| esnet | iperf3 | 3.14 < 3.22 | affected |
Weaknesses
- CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')
References
- https://github.com/esnet/iperf/releases/tag/3.22
- https://github.com/esnet/iperf/blob/master/RELNOTES.md
- https://www.vulncheck.com/advisories/iperf3-udp-receive-worker-infinite-loop-dos
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