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CVE-2025-2516— Use of a weak cryptographic key in the signature verification process in WPS Office

Quick assessment

Affected
Kingsoft WPS Office
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.

Kingsoft WPS Office是中国金山软件（Kingsoft）公司的一种办公软件。提供文件处理功能。 Kingsoft WPS Office存在安全漏洞，该漏洞源于签名验证过程中使用弱加密密钥对，可能导致攻击者成功恢复私钥并签名组件。

AI Predicted 5.0 Difficulty: Hard EPSS 0.14% · P3
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I. Basic Information for CVE-2025-2516

Vulnerability Information
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Vulnerability Title
Use of a weak cryptographic key in the signature verification process in WPS Office
Source: CVE Program / CVE List V5
Vulnerability Description
The use of a weak cryptographic key pair in the signature verification process in WPS Office (Kingsoft) on Windows allows an attacker who successfully recovered the private key to sign components. As older versions of WPS Office did not validate the update server's certificate, an Adversary-In-The-Middle attack was possible allowing updates to be hijacked.
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:H/SC:H/SI:H/SA:H/U:Amber
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的加密强度
Source: CVE Program / CVE List V5
Vulnerability Title
Kingsoft WPS Office 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kingsoft WPS Office是中国金山软件（Kingsoft）公司的一种办公软件。提供文件处理功能。 Kingsoft WPS Office存在安全漏洞，该漏洞源于签名验证过程中使用弱加密密钥对，可能导致攻击者成功恢复私钥并签名组件。
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
Kingsoft WPS Office 12.1.0.18276 -

II. Public POCs for CVE-2025-2516

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III. Intelligence Information for CVE-2025-2516

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Security Blog Posts for CVE-2025-2516 (1)

IV. Related Vulnerabilities

Same product: WPS Office
Same vendor: Kingsoft
Same weakness: CWE-326

V. Comments for CVE-2025-2516

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