DrayTek Vigor 2960/Vigor 3900/Vigor 300B 1.5.1.3 HTTP Message mainfunction.cgi command injection

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.
6.1$0-$5k0.00

A vulnerability, which was classified as critical, was found in DrayTek Vigor 2960, Vigor 3900 and Vigor 300B 1.5.1.3 (Router Operating System). Affected is an unknown code of the file mainfunction.cgi of the component HTTP Message Handler. The manipulation with an unknown input leads to a privilege escalation vulnerability. CWE is classifying the issue as CWE-77. The software constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. The impact remains unknown.

The weakness was disclosed 03/30/2022. The advisory is shared for download at gist.github.com. This vulnerability is traded as CVE-2021-43118 since 11/01/2021. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 03/30/2022). The MITRE ATT&CK project declares the attack technique as T1202.

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

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CPE 2.3info

CPE 2.2info

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.1

VulDB Base Score: 6.3
VulDB Temp Score: 6.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Privilege escalation
CWE: CWE-77
ATT&CK: T1202

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

11/01/2021 CVE reserved
03/30/2022 +148 days Advisory disclosed
03/30/2022 +0 days VulDB entry created
04/01/2022 +2 days VulDB last update

Sourcesinfo

Advisory: gist.github.com
Status: Not defined

CVE: CVE-2021-43118 (🔒)

Entryinfo

Created: 03/30/2022 07:41 AM
Updated: 04/01/2022 09:24 AM
Changes: (1) source_cve_nvd_summary
Complete: 🔍

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