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How the CVE Works
CVE-2025-54350 affects iperf versions before 3.19.1, where a malformed authentication request triggers an assertion failure in `iperf_auth.c` during Base64 decoding. This flaw causes the application to crash, leading to a denial of service (DoS). Attackers can exploit this by sending crafted authentication packets, disrupting legitimate iperf sessions. The vulnerability stems from insufficient input validation in the authentication mechanism, allowing unauthenticated attackers to force an abrupt termination of the service.
DailyCVE Form
Platform: iperf
Version: < 3.19.1
Vulnerability: Auth Bypass
Severity: Critical
Date: 08/05/2025
Prediction: Patch by 09/2025
What Undercode Say
$ iperf3 -c <target> --auth malformed_token Assertion failed: (decode_result != -1), function Base64Decode, file iperf_auth.c
How Exploit
Craft malformed Base64 auth token → Send to iperf server → Trigger assertion → Crash service.
Protection from this CVE
Update to iperf 3.19.1+.
Impact
DoS via unauthenticated crash.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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