CVE-2025-54350Network attack vector

Server crash via malformed authentication token

Published Aug 3, 2025 · Updated Nov 3, 2025

Reachable assertion in ESnet iperf3 before 3.19.1 allows remote attackers to crash an authentication-enabled server via malformed credentials. Base64Decode passes the attacker-controlled authentication token to BIO_read, then asserts that the returned length equals a calculated decoded length; malformed Base64 violates that assumption and exits the process. Exploitation requires SSL authentication to be enabled and interrupts the server process, with no reported confidentiality or integrity impact.

CVSS severity3.7
Low
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in ESnet iperf3 before 3.19.1 allows remote attackers to crash an authentication-enabled server via malformed credentials. Base64Decode passes the attacker-controlled authentication token to BIO_read, then asserts that the returned length equals a calculated decoded length; malformed Base64 violates that assumption and exits the process. Exploitation requires SSL authentication to be enabled and interrupts the server process, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2025-54350
Published
Aug 3, 2025
Updated
Nov 3, 2025
Vendor
ESnet
Product
iperf3
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.19.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ESnet · iperf3version=0 <3.19.1

Published CVSS scores

5.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.7MITRE CNACVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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