CVE-2025-54885— Thinbus generates insufficient entropy: 252 bits vs minimum 256 bits
Quick assessment
Affected
simbo1905 thinbus-srp-npm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Thinbus Javascript Secure Remote Password是Simon Massey个人开发者的一个安全远程密码实现程序。 Thinbus Javascript Secure Remote Password 2.0.0及之前版本存在安全特征问题漏洞，该漏洞源于协议合规性问题导致熵值不足。
Possible ATT&CK Techniques 1 AI
T1110 · Brute Force
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I. Basic Information for CVE-2025-54885
Vulnerability Information
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Vulnerability Title
Thinbus generates insufficient entropy: 252 bits vs minimum 256 bits
Source: CVE Program / CVE List V5
Vulnerability Description
Thinbus Javascript Secure Remote Password is a browser SRP6a implementation for zero-knowledge password authentication. In versions 2.0.0 and below, a protocol compliance bug causes the client to generate a fixed 252 bits of entropy instead of the intended bit length of the safe prime (defaulted to 2048 bits). The client public value is being generated from a private value that is 4 bits below the specification. This reduces the protocol's designed security margin it is now practically exploitable. The servers full sized 2048 bit random number is used to create the shared session key and password proof. This is fixed in version 2.0.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
信息熵不充分
Source: CVE Program / CVE List V5
Vulnerability Title
Thinbus Javascript Secure Remote Password 安全特征问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Thinbus Javascript Secure Remote Password是Simon Massey个人开发者的一个安全远程密码实现程序。 Thinbus Javascript Secure Remote Password 2.0.0及之前版本存在安全特征问题漏洞，该漏洞源于协议合规性问题导致熵值不足。
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 |
|---|---|---|---|---|
| simbo1905 | thinbus-srp-npm | < 2.0.1 | - |
|
II. Public POCs for CVE-2025-54885
| # | POC Description | Source Link | Shenlong Link |
|---|
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