Is CVE-2021-42638 in the CISA KEV catalog?

No. CVE-2021-42638 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-42638?

CVE-2021-42638 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2021-42638?

CVE-2021-42638 has an EPSS score of 5.66% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-42638?

Upgrade web stack to 19.1.1.13 or later.

CVE & CISA-KEV Catalog

CVE-2021-42638

HIGHEPSS 92th pctl

8.1

CVSS v3

NVD

Description

PrinterLogic Web Stack versions 19.1.1.13 SP9 and below do not sanitize user input resulting in pre-auth remote code execution.

CWE-77Command Injection

How to fix

Remediation Available

web stackNVD

Affected:< 19.1.1.13Fixed in:19.1.1.13CVE-2021-42638derived 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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

5.66%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Exploit1

yahooinc.com

Vendor Advisory2

Third-Party Advisory4

Related Vulnerabilities

Other CWE-77 (Command Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2024-21887	Critical	9.1	100%	KEV + Ransom	-
CVE-2023-1671	Critical	9.8	100%	KEV	Fix
CVE-2023-1389	High	8.8	100%	KEV	Fix
CVE-2021-1498	Critical	9.8	100%	KEV	Fix
CVE-2012-1823	Critical	9.8	100%	KEV	Fix

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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.