VDB-191828 · CVE-2021-46508 · ID 188

Cesanta MJS up to 2.19.x src/mjs_bcode.c parts_cnt assertion

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

A vulnerability, which was classified as problematic, has been found in Cesanta MJS up to 2.19.x. Affected by this issue is the function parts_cnt of the file src/mjs_bcode.c. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-617. Impacted is availability. CVE summarizes:

There is an Assertion `i < parts_cnt' failed at src/mjs_bcode.c in Cesanta MJS v2.20.0.

The weakness was presented 01/28/2022 as 188. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2021-46508 since 01/24/2022. The attack needs to approached within the local network. The successful exploitation requires a simple authentication. There are known technical details, but no exploit is available.

Upgrading to version 2.20.0 eliminates this vulnerability.

Productinfoedit

Vendor

Cesanta

Name

CPE 2.3infoedit

CPE 2.2infoedit

CVSSv3infoedit

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: 🔍

CVSSv2infoedit

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: 🔍

Exploitinginfoedit

Class: Denial of service
CWE: CWE-617
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Threat Intelligenceinfoedit

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

Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: MJS 2.20.0

Timelineinfoedit

01/24/2022 CVE reserved
01/28/2022 +4 days Advisory disclosed
01/28/2022 +0 days VulDB entry created
01/30/2022 +2 days VulDB last update

Sourcesinfoedit

Advisory: 188
Status: Confirmed

CVE: CVE-2021-46508 (🔒)

Entryinfoedit

Created: 01/28/2022 10:09 AM
Updated: 01/30/2022 10:50 AM
Changes: (1) source_cve_nvd_summary
Complete: 🔍