USN-7970-1: iperf3 vulnerabilities

USN-7970-1: iperf3 vulnerabilities

Publication date: 21 January 2026
Overview: Several security issues were fixed in iperf3.

Packages
iperf3 - A TCP, UDP, and SCTP network bandwidth measurement tool

Details
Jorge Sancho Larraz discovered that iperf3 did not properly manage certain
inputs, which could cause the server process to stop responding, waiting
for input on the control connection. A remote attacker could possibly use
this issue to cause a denial of service. This issue was only addressed in
Ubuntu 22.04 LTS. (CVE-2023-7250)

It was discovered that iperf3 had a timing side-channel when performing RSA
decryption. An attacker could possibly use this issue to recover sensitive
information. This issue was only addressed in Ubuntu 20.04 LTS and Ubuntu
22.04 LTS and Ubuntu 24.04 LTS. (CVE-2024-26306)

It was discovered that iperf3 incorrectly handled certain inputs. An
attacker could possibly use this issue to cause a denial of service. This
issue was only addressed in Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu
24.04 LTS. (CVE-2024-53580)

Han Lee discovered that iperf3 had an off-by-one heap overflow. An attacker
could possibly use this issue to crash the program or execute arbitrary
code. This issue was only addressed in Ubuntu 20.04 LTS, Ubuntu 22.04 LTS,
Ubuntu 24.04 LTS and Ubuntu 25.10. (CVE-2025-54349)

Han Lee discovered that iperf3 did not properly manage certain inputs. An
attacker could possibly use this issue to cause a denial of service.
(CVE-2025-54350)

Update instructions
In general, a standard system update will make all the necessary changes.

25.10 questing

• iperf3 – 3.18-2ubuntu0.1
• libiperf0 – 3.18-2ubuntu0.1

24.04 LTS noble

• iperf3 – 3.16-1ubuntu0.1~esm1
• libiperf0 – 3.16-1ubuntu0.1~esm1

22.04 LTS jammy

• iperf3 – 3.9-1+deb11u1ubuntu0.1
• libiperf0 – 3.9-1+deb11u1ubuntu0.1

20.04 LTS focal

• iperf3 – 3.7-3ubuntu0.1~esm2
• libiperf0 – 3.7-3ubuntu0.1~esm2