VDB-175226 · CVE-2021-32816 · GHSL-2021-027

ProtonMail Web Client prior 3.16.60 Regular Expression resource consumption

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.4	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in ProtonMail Web Client. The impacted element is an unknown function of the component Regular Expression Handler. Such manipulation leads to resource consumption. This vulnerability is documented as CVE-2021-32816. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in ProtonMail Web Client and classified as problematic. Affected by this issue is some unknown functionality of the component Regular Expression Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability.

The weakness was released 05/15/2021 as GHSL-2021-027. The advisory is available at securitylab.github.com. This vulnerability is handled as CVE-2021-32816. The technical details are unknown and an exploit is not available.

Upgrading to version 3.16.60 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

ProtonMail

Name

Web Client

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Web Client 3.16.60
Patch: github.com

Timelineinfo

05/12/2021 🔍
05/15/2021 +3 days 🔍
05/15/2021 +0 days 🔍
05/20/2021 +4 days 🔍

Sourcesinfo

Advisory: GHSL-2021-027
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-32816 (🔍)
GCVE (CVE): GCVE-0-2021-32816
GCVE (VulDB): GCVE-100-175226

Entryinfo

Created: 05/15/2021 18:27
Updated: 05/20/2021 01:15
Changes: 05/15/2021 18:27 (39), 05/20/2021 01:04 (6), 05/20/2021 01:15 (1)
Complete: 🔍
Cache ID: 216::103