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CVE-2025-62514— `libparsec_crypto` does not check for weak order point of curve 25519

Quick assessment

Affected
Scille parsec-cloud
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.

parsec-cloud是Scille开源的一个文件共享工具。 parsec-cloud 3.6.0之前版本存在安全漏洞，该漏洞源于libparsec_crypto组件未检查Curve25519的弱阶点，可能导致中间人攻击。

CVSS 8.3 · High EPSS 0.27% · P17

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2025-62514

Vulnerability Information
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Vulnerability Title
`libparsec_crypto` does not check for weak order point of curve 25519
Source: CVE Program / CVE List V5
Vulnerability Description
Parsec is a cloud-based application for cryptographically secure file sharing. In versions on the 3.x branch prior to 3.6.0, `libparsec_crypto`, a component of the Parsec application, does not check for weak order point of Curve25519 when compiled with its RustCrypto backend. In practice this means an attacker in a man-in-the-middle position would be able to provide weak order points to both parties in the Diffie-Hellman exchange, resulting in a high probability to for both parties to obtain the same shared key (hence leading to a successful SAS code exchange, misleading both parties into thinking no MITM has occurred) which is also known by the attacker. Note only Parsec web is impacted (as Parsec desktop uses `libparsec_crypto` with the libsodium backend). Version 3.6.0 of Parsec patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用已被攻破或存在风险的密码学算法
Source: CVE Program / CVE List V5
Vulnerability Title
parsec-cloud 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
parsec-cloud是Scille开源的一个文件共享工具。 parsec-cloud 3.6.0之前版本存在安全漏洞，该漏洞源于libparsec_crypto组件未检查Curve25519的弱阶点，可能导致中间人攻击。
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
Scille parsec-cloud >= 3.0.0-alpha, < 3.6.0 -

II. Public POCs for CVE-2025-62514

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III. Intelligence Information for CVE-2025-62514

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Vendor Advisories for CVE-2025-62514 (1)

IV. Related Vulnerabilities

Same product: parsec-cloud
Same vendor: Scille
Same weakness: CWE-327

V. Comments for CVE-2025-62514

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