CVE-2026-102253 iperf3 - Denial of Service

iperf3 < 3.22 contains a denial of service vulnerability caused by crafted control-channel parameter messages and UDP datagrams, letting unauthenticated remote attackers crash the server's UDP receive worker into an infinite loop, exploit requires sending specific crafted messages.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Not required
EPSS
0.43% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
29 September 2026
Updated
15 October 2026
Weakness
CWE-835

Vendor fix

Update to version 3.22 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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