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CVE-2021-32816— Regular expression Denial of Service in ProtonMail

Quick assessment

Affected
ProtonMail WebClient
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.

AngularJS是一款基于TypeScript的开源Web应用程序框架。ProtonMail Web Client是AngularJS Web 客户端。 AngularJS ProtonMail Web Client 存在资源管理错误漏洞，该漏洞源于存在正则表达式拒绝服务漏洞。

CVSS 6.5 · Medium EPSS 1.01% · P61

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-32816

Vulnerability Information
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Vulnerability Title
Regular expression Denial of Service in ProtonMail
Source: CVE Program / CVE List V5
Vulnerability Description
ProtonMail Web Client is the official AngularJS web client for the ProtonMail secure email service. ProtonMail Web Client before version 3.16.60 has a regular expression denial-of-service vulnerability. This was fixed in commit 6687fb. There is a full report available in the referenced GHSL-2021-027.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
AngularJS ProtonMail Web Client 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
AngularJS是一款基于TypeScript的开源Web应用程序框架。ProtonMail Web Client是AngularJS Web 客户端。 AngularJS ProtonMail Web Client 存在资源管理错误漏洞，该漏洞源于存在正则表达式拒绝服务漏洞。
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
ProtonMail WebClient < 3.16.60 -

II. Public POCs for CVE-2021-32816

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III. Intelligence Information for CVE-2021-32816

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Patches & Fixes for CVE-2021-32816 (1)

Other References for CVE-2021-32816 (1)

IV. Related Vulnerabilities

Same weakness: CWE-400

V. Comments for CVE-2021-32816

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