Cesanta MJS 2.20.0 src/mjs_core.c mjs_disown heap-based overflow

HistoryDiffrelatejsonxmlCTI

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.
5.5	$0-$5k	0.00

Summaryinfo

A vulnerability marked as critical has been reported in Cesanta MJS 2.20.0. Affected by this issue is the function mjs_disown of the file src/mjs_core.c. This manipulation causes heap-based overflow. This vulnerability is tracked as CVE-2021-46518. No exploit exists.

Detailsinfo

A vulnerability was found in Cesanta MJS 2.20.0. It has been declared as critical. Affected by this vulnerability is the function mjs_disown of the file src/mjs_core.c. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was disclosed 01/28/2022 as 195. The advisory is shared at github.com. This vulnerability is known as CVE-2021-46518 since 01/24/2022. Technical details are known, but no exploit is available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

Cesanta

Name

Version

2.20.0

License

commercial

Website

Product: https://github.com/cesanta/mjs/

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.5
VulDB Temp Score: 5.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
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: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/24/2022 🔍
01/28/2022 +4 days 🔍
01/28/2022 +0 days 🔍
01/30/2022 +2 days 🔍

Sourcesinfo

Product: github.com

Advisory: 195
Status: Confirmed

CVE: CVE-2021-46518 (🔍)
GCVE (CVE): GCVE-0-2021-46518
GCVE (VulDB): GCVE-100-191797

Entryinfo

Created: 01/28/2022 09:53
Updated: 01/30/2022 09:01
Changes: 01/28/2022 09:53 (39), 01/30/2022 09:01 (1)
Complete: 🔍
Cache ID: 216::103