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Fencer Vulns
high 7.5

CVE-2026-102253 json

iperf3 < 3.22 UDP Receive Worker Infinite Loop DoS

published 2026-09-29 40 d ago modified 2026-11-08 23 h ago also EUVD-2026-89415

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

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.

Patch / fix

  • esnet iperf3 3.22
  • iperf3 Debian 14 3.22-0.1

debian advisories DEBIAN-CVE-2026-102253

  • iperf SLE Module for Package Hub 15 SP7, Enterprise Storage 7.1 3.22-150000.3.18.1
  • iperf SLES 16.0, Linux Micro Extras 6.2, SLES for SAP applications 16.0 3.21-160000.1.1

suse advisories SUSE-SU-2026:4678-1SUSE-SU-2026:24178-1SUSE-SU-2026:24234-1

  • iperf openSUSE Leap 16.0 3.21-160000.1.1
  • iperf openSUSE Tumbleweed 3.22-1.1

opensuse advisories openSUSE-SU-2026:22090-1openSUSE-SU-2026:12060-1

  • iperf3 AlmaLinux 10 3.17.1-6.el10_2.2

almalinux advisories ALSA-2026:88207

  • iperf3 Rocky Linux 10 3.17.1-6.el10_2.2

rocky linux advisories RLSA-2026:88207

  • iperf3 Azure Linux 3.0 3.17.1-7

azure linux advisories AZL-105051

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-102253 updated cvss 7.5

iperf3: iperf3: Denial of Service via UDP receive worker infinite loop

  • Red Hat Enterprise Linux AppStream (v. 10) iperf3 3.17.1-6.el10_2.2
    fixed: vendor fix RHSA-2026:88207
  • Red Hat Enterprise Linux 7 iperf3 Red Hat Enterprise Linux 8 iperf3 Red Hat Enterprise Linux 9 iperf3
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
39 d ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 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
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • esnet iperf3

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.