Is CVE-2021-42631 in the CISA KEV catalog?

No. CVE-2021-42631 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-42631?

CVE-2021-42631 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2021-42631?

CVE-2021-42631 has an EPSS score of 6.32% (93th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-42631?

Upgrade web stack to 19.1.1.13 or later.

CVE & CISA-KEV Catalog

CVE-2021-42631

HIGHEPSS 93th pctl

8.1

CVSS v3

NVD

Description

PrinterLogic Web Stack versions 19.1.1.13 SP9 and below deserializes attacker controlled leading to pre-auth remote code execution.

CWE-502Deserialization of Untrusted Data

How to fix

Remediation Available

web stackNVD

Affected:< 19.1.1.13Fixed in:19.1.1.13CVE-2021-42631derived 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

6.32%probability of exploitation in 30 days

93rdpercentile

High risk: more likely to be exploited than 93% of all known CVEs.

References

Exploit1

yahooinc.com

Vendor Advisory2

Third-Party Advisory4

Related Vulnerabilities

Other CWE-502 (Deserialization of Untrusted Data) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-0669	High	7.2	100%	KEV + Ransom	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-35464	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-29300	Critical	9.8	100%	KEV + Ransom	-
CVE-2025-53770	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-47986	Critical	9.8	100%	KEV + Ransom	-

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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.