CVE-2021-42639
CWE-79Published: February 2, 2022· Updated: Jul 9, 2026
Official Description
PrinterLogic Web Stack versions 19.1.1.13 SP9 and below are vulnerable to multiple reflected cross site scripting vulnerabilities. Attacker controlled input is reflected back in the page without sanitization.
Technical Analysis
CVE-2021-42639 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.
The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.
From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (12)
Quick Facts
Related CVEs (CWE-79)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-42639 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts