Is CVE-2021-42531 in the CISA KEV catalog?

No. CVE-2021-42531 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-42531?

CVE-2021-42531 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-42531?

CVE-2021-42531 has an EPSS score of 3.60% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-42531?

Upgrade exempi on debian 11 to 2.5.2-1+deb11u1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-42531

HIGHEPSS 88th pctl

7.8

CVSS v3

NVD

Description

XMP Toolkit SDK version 2021.07 (and earlier) is affected by a stack-based buffer overflow vulnerability potentially resulting in arbitrary code execution in the context of the current user. Exploitation requires user interaction in that a victim must open a crafted file.

CWE-121Stack-based Buffer Overflow CWE-787Out-of-bounds Write

How to fix

Remediation Available

exempiDebian

Fixed in:2.5.2-1+deb11u1CVE-2021-42531

Fixed in:2.6.0-1CVE-2021-42531

exempiUbuntu

Fixed in:2.4.5-2ubuntu0.1USN-5483-1

Fixed in:2.5.1-1ubuntu0.1USN-5483-1

Fixed in:2.5.2-1ubuntu0.22.04.1USN-5483-1

libexempi3Ubuntu

Fixed in:2.4.5-2ubuntu0.1USN-5483-1

libexempi8Ubuntu

Fixed in:2.5.1-1ubuntu0.1USN-5483-1

Fixed in:2.5.2-1ubuntu0.22.04.1USN-5483-1

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 VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

3.60%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Vendor Advisory1

helpx.adobe.com

Third-Party Advisory1

lists.debian.org

Other references1

lists.debian.org

Related Vulnerabilities

Other CWE-121 (Stack-based Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2009-0927	High	8.8	97%	KEV	Fix
CVE-2020-10924	High	8.8	87%	-	-
CVE-2022-20705	Critical	10.0	80%	-	-

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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 2025-11-03.