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How the CVE Works
CVE-2025-54351 exploits a buffer overflow vulnerability in iperf versions before 3.19.1, specifically in the `net.c` component. The flaw occurs when the `–skip-rx-copy` flag is used, triggering improper handling of `MSG_TRUNC` in the `recv` function. This leads to uncontrolled data writing beyond allocated memory boundaries, potentially allowing remote code execution or denial of service. The issue stems from insufficient bounds checking when processing truncated network packets.
DailyCVE Form
Platform: iperf
Version: < 3.19.1
Vulnerability: Buffer Overflow
Severity: Critical
Date: 08/02/2025
Prediction: Patch expected by 08/20/2025
What Undercode Say
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$ git clone https://github.com/iperf/iperf $ grep -r "MSG_TRUNC" ./src/net.c $ checksec --file=iperf3
How Exploit
import socket
payload = b"A" 1024 + struct.pack("<Q", 0xdeadbeef)
sock.sendto(payload, (target_ip, 5201))
Protection from this CVE
– Update to iperf 3.19.1+
– Disable `–skip-rx-copy` flag
– Apply stack canaries/ASLR
Impact
– Remote Code Execution
– Denial of Service
– Memory Corruption
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Sources:
Reported By: nvd.nist.gov
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