Is CVE-2021-42639 in the CISA KEV catalog?

No. CVE-2021-42639 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-42639?

CVE-2021-42639 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2021-42639?

CVE-2021-42639 has an EPSS score of 1.15% (63th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-42639?

Upgrade web stack to 19.1.1.13 or later.

CVE & CISA-KEV Catalog

CVE-2021-42639

MEDIUM

6.1

CVSS v3

NVD

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.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

web stackNVD

Affected:< 19.1.1.13Fixed in:19.1.1.13CVE-2021-42639derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploit Intelligence

1.15%probability of exploitation in 30 days

63rdpercentile

Moderate risk: more likely to be exploited than 63% of all known CVEs.

References

Exploit1

yahooinc.com

Vendor Advisory1

printerlogic.com

Third-Party Advisory3

Product1

printerlogic.com

Other references1

portswigger.net

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

Embed a live status badge for CVE-2021-42639

Markdown

[![CVE-2021-42639](https://tridentstack.com/cve/badge/CVE-2021-42639.svg)](https://tridentstack.com/cve/CVE-2021-42639)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-42639"><img src="https://tridentstack.com/cve/badge/CVE-2021-42639.svg" alt="CVE-2021-42639"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-05.