CVE-2024-2873Network attack vector

Authentication bypass via out-of-sequence channel messages

Published Mar 25, 2024 · Updated Aug 1, 2024

Improper authentication in wolfSSL wolfSSH before 1.4.17 allows remote attackers to create SSH channels before user authentication. The server-side handshake state machine accepts channel-open messages without verifying that user authentication has completed. The bundled servers terminate such sessions before shell or forwarding access, but an embedding application that omits username and credential checks can grant unauthorized system access.

CVSS severity9.1
Critical
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in wolfSSL wolfSSH before 1.4.17 allows remote attackers to create SSH channels before user authentication. The server-side handshake state machine accepts channel-open messages without verifying that user authentication has completed. The bundled servers terminate such sessions before shell or forwarding access, but an embedding application that omits username and credential checks can grant unauthorized system access.

The record

CVE
CVE-2024-2873
Published
Mar 25, 2024
Updated
Aug 1, 2024
Vendor
wolfSSL
Product
wolfSSH
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 25, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record 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 <1.4.16
  2. Affected versionversion=0 <=v1.4.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

wolfSSL · wolfSSHversion=0 <1.4.16; version=0 <=v1.4.16

Published CVSS scores

9.1wolfSSL Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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.

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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-287Improper Authentication
T1190Exploit Public-Facing Application

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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