Is CVE-2021-20240 in the CISA KEV catalog?

No. CVE-2021-20240 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20240?

CVE-2021-20240 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2021-20240?

CVE-2021-20240 has an EPSS score of 2.35% (82th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20240?

Upgrade gdk-pixbuf on debian 11 to 2.42.2+dfsg-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-20240

HIGHEPSS 82th pctl

8.8

CVSS v3

NVD

Description

A flaw was found in gdk-pixbuf in versions before 2.42.0. An integer wraparound leading to an out of bounds write can occur when a crafted GIF image is loaded. An attacker may cause applications to crash or could potentially execute code on the victim system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CWE-191

How to fix

Remediation Available

gdk-pixbufDebian

Fixed in:2.42.2+dfsg-1CVE-2021-20240

gdk-pixbufUbuntu

Fixed in:2.40.0+dfsg-3ubuntu0.2USN-4743-1

libgdk-pixbuf2.0-0Ubuntu

Fixed in:2.40.0+dfsg-3ubuntu0.2USN-4743-1

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 VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.35%probability of exploitation in 30 days

82ndpercentile

Elevated risk: more likely to be exploited than 82% of all known CVEs.

References

Patch1

bugzilla.redhat.com

Third-Party Advisory3

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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 2025-02-12.