CVE-2026-102253

HighCVSS 7.5/10Last modified Sep 30, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-835

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
esnet	iperf3	>= 3.14, < 3.22

References

Timeline

Published: Sep 29, 2026
Last modified: Sep 30, 2026
NVD status: Awaiting Analysis

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