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CVE-2025-4658— Authentication Bypass in OPKSSH

Quick assessment

Affected
OPKSSH OPKSSH
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenPubkey是OpenPubkey开源的一个OpenPubkey的参考实现。 OpenPubkey 0.10.0之前版本和OPKSSH 0.5.0之前版本存在安全漏洞，该漏洞源于特制JWS可绕过签名验证，可能导致绕过OPKSSH身份验证。

AI Predicted 9.8 Difficulty: Easy EPSS 0.34% · P27

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-4658

Vulnerability Information
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Vulnerability Title
Authentication Bypass in OPKSSH
Source: CVE Program / CVE List V5
Vulnerability Description
Versions of OpenPubkey library prior to 0.10.0 contained a vulnerability that would allow a specially crafted JWS to bypass signature verification. As OPKSSH depends on the OpenPubkey library for authentication, this vulnerability in OpenPubkey also applies to OPKSSH versions prior to 0.5.0 and would allow an attacker to bypass OPKSSH authentication.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用基本弱点进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
OpenPubkey 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenPubkey是OpenPubkey开源的一个OpenPubkey的参考实现。 OpenPubkey 0.10.0之前版本和OPKSSH 0.5.0之前版本存在安全漏洞，该漏洞源于特制JWS可绕过签名验证，可能导致绕过OPKSSH身份验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OPKSSH OPKSSH 0.1.0 ~ 0.4.0 -

II. Public POCs for CVE-2025-4658

# POC Description Source Link Shenlong Link
1 None https://github.com/stuxbench/dropbear-cve-2025-4658 POC Details
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III. Intelligence Information for CVE-2025-4658

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IV. Related Vulnerabilities

Same product: OPKSSH
Same vendor: OPKSSH
Same weakness: CWE-305

V. Comments for CVE-2025-4658

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