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CVE-2026-102253— iperf3 < 3.22 UDP Receive Worker Infinite Loop DoS

Quick assessment

Affected
esnet iperf3
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 messag

CVSS 7.5 · High
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I. Basic Information for CVE-2026-102253

Vulnerability Information

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Vulnerability Title
iperf3 < 3.22 UDP Receive Worker Infinite Loop DoS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
esnet iperf3 3.14 ~ 3.22 -

II. Public POCs for CVE-2026-102253

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III. Intelligence Information for CVE-2026-102253

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Other References for CVE-2026-102253 (3)

IV. Related Vulnerabilities

Same product: iperf3
Same weakness: CWE-835

V. Comments for CVE-2026-102253

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