VDB-186576 · CVE-2021-34420 · GCVE-0-2021-34420

Zoom Client for Meetings up to 5.5.3 on Meetings signature verification

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.
4.8	$0-$5k	0.00

Summaryinfo

A vulnerability described as problematic has been identified in Zoom Client for Meetings up to 5.5.3 on Meetings. Impacted is an unknown function. The manipulation results in signature verification. This vulnerability is identified as CVE-2021-34420. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Zoom Client for Meetings up to 5.5.3 on Meetings (Unified Communication Software). It has been classified as problematic. Affected is an unknown code block. The manipulation with an unknown input leads to a signature verification vulnerability. CWE is classifying the issue as CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was released 11/12/2021. The advisory is shared for download at explore.zoom.us. This vulnerability is traded as CVE-2021-34420 since 06/09/2021. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading to version 5.5.4 eliminates this vulnerability.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Unified Communication Software

Vendor

Zoom

Name

Client for Meetings

Version

License

free

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.0
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 4.7
CNA Vector (Zoom Video Communications, Inc.): 🔍

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: Signature verification
CWE: CWE-347 / CWE-345
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

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: Client for Meetings 5.5.4

Timelineinfo

06/09/2021 🔍
11/12/2021 +156 days 🔍
11/12/2021 +0 days 🔍
11/16/2021 +4 days 🔍

Sourcesinfo

Advisory: explore.zoom.us
Status: Confirmed

CVE: CVE-2021-34420 (🔍)
GCVE (CVE): GCVE-0-2021-34420
GCVE (VulDB): GCVE-100-186576

Entryinfo

Created: 11/12/2021 08:32
Updated: 11/16/2021 10:03
Changes: 11/12/2021 08:32 (49), 11/16/2021 10:00 (1), 11/16/2021 10:03 (1)
Complete: 🔍
Cache ID: 216::103