CVE-2026-71217
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk35th percentile - higher than 35% of all known CVEs
Summary
A flaw was found in iperf3. A remote attacker can exploit this vulnerability by sending crafted control-channel JSON with oversized numeric parameters, such as `parallel` and `len`, which are not properly validated by the server. This improper input validation can lead to excessive stream and thread creation, as well as large buffer allocations, causing resource exhaustion. Consequently, this can result in a Denial of Service (DoS) on the affected iperf3 server.
Risk Assessment
The risk includes service disruption and resource exhaustion on the server, which could lead to unavailability of the application to users.
Recommendation
Update iperf3 to a patched version and implement network-level restrictions to block suspicious requests.
Original NVD description (English source)
A flaw was found in iperf3. A remote attacker can exploit this vulnerability by sending crafted control-channel JSON with oversized numeric parameters, such as `parallel` and `len`, which are not properly validated by the server. This improper input validation can lead to excessive stream and thread creation, as well as large buffer allocations, causing resource exhaustion. Consequently, this can result in a Denial of Service (DoS) on the affected iperf3 server.