In iperf before 3.19.1, iperfauth.c has an off-by-one error and resultant heap-based buffer overflow.

In iperf before 3.19.1, net.c has a buffer overflow when --skip-rx-copy is used (for MSGTRUNC in recv).

The parsestring function in cjson.c in the cJSON library mishandles UTF8/16 strings, which allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a non-hex character in a JSON string, which triggers a heap-based buffer overflow.

iperf v3.17.1 was discovered to contain a segmentation violation via the iperfexchangeparameters() function.

iperf3 before 3.14 allows peers to cause an integer overflow and heap corruption via a crafted length field.

If the iperf3 server is running with --rsa-private-key-path option, the user authentication API can be attacked.

A flaw was found in iperf, a utility for testing network performance using TCP, UDP, and SCTP. A malicious or malfunctioning client can send less than the expected amount of data to the iperf server, which can cause the server to hang indefinitely waiting for the remainder or until the connection gets closed. This will prevent other connections to the server, leading to a denial of service.

In iperf before 3.19.1, iperfauth.c has a Base64Decode assertion failure and application exit upon a malformed authentication attempt.