Listen to this Post
How the CVE Works
CVE-2025-54349 is an off-by-one error in `iperf_auth.c` in iperf versions before 3.19.1, leading to a heap-based buffer overflow. The flaw occurs during authentication handling, where improper bounds checking allows writing one byte beyond the allocated buffer. Attackers can exploit this by crafting malicious authentication packets, potentially leading to arbitrary code execution or a denial-of-service (DoS) condition. The vulnerability stems from incorrect length calculations when processing user-supplied input, corrupting heap metadata and enabling further exploitation.
DailyCVE Form
Platform: iperf
Version: < 3.19.1
Vulnerability: Heap overflow
Severity: Critical
Date: 08/05/2025
Prediction: Patch by 09/2025
What Undercode Say
Analytics
$ git clone https://github.com/iperf/iperf3 $ grep -r "iperf_auth.c" ./src $ checksec --file=iperf3
How Exploit
import socket payload = b"A" (buffer_size + 1) sock.send(payload)
Protection from this CVE
- Update to iperf 3.19.1+
- Disable authentication if unused
- Use stack canaries/ASLR
Impact
- RCE/DoS possible
- Compromise of network metrics
- System instability
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
