VDB-170816 · CVE-2021-3377 · Nessus 257883

ansi_up up to 4.x on npm ANSI Escape Code cross site scripting

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.
4.7	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in ansi_up up to 4.x on npm. This affects an unknown function of the component ANSI Escape Code Handler. Such manipulation leads to cross site scripting. This vulnerability is documented as CVE-2021-3377. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in ansi_up up to 4.x on npm (NPM Package) and classified as problematic. Affected by this issue is some unknown functionality of the component ANSI Escape Code Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity.

The weakness was released 03/06/2021. The advisory is shared for download at doyensec.com. This vulnerability is handled as CVE-2021-3377. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

The vulnerability scanner Nessus provides a plugin with the ID 257883 (Linux Distros Unpatched Vulnerability : CVE-2021-3377), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.0.0 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.

The vulnerability is also documented in the vulnerability database at Tenable (257883). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

NPM Package

Name

ansi_up

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

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

NVD Base Score: 6.1
NVD Vector: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
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
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Nessus ID: 257883
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-3377

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: ansi_up 5.0.0
Patch: github.com

Timelineinfo

02/01/2021 🔍
03/06/2021 +33 days 🔍
03/06/2021 +0 days 🔍
11/04/2025 +1704 days 🔍

Sourcesinfo

Advisory: doyensec.com
Status: Confirmed

CVE: CVE-2021-3377 (🔍)
GCVE (CVE): GCVE-0-2021-3377
GCVE (VulDB): GCVE-100-170816

Entryinfo

Created: 03/06/2021 11:34
Updated: 11/04/2025 01:04
Changes: 03/06/2021 11:34 (40), 03/28/2021 21:24 (5), 03/28/2021 21:27 (18), 08/30/2025 21:42 (17), 11/04/2025 01:04 (1)
Complete: 🔍
Cache ID: 216::103

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