CVE-2021-3377

PoC —

CVSS 3.1

6.1 medium

EPSS

8%p94

Published

Mar 5, 2021 (Mar 5, 2021)

Modified

Jun 17, 2026

Description

The npm package ansi_up converts ANSI escape codes into HTML. In ansi_up v4, ANSI escape codes can be used to create HTML hyperlinks. Due to insufficient URL sanitization, this feature is affected by a cross-site scripting (XSS) vulnerability. This issue is fixed in v5.0.0.

Vendors: ansi up project
Products: ansi up
Weakness: CWE-79
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (8.0%)

In the news0 stories

No ingested article mentions this CVE yet.