Is CVE-2021-40633 in the CISA KEV catalog?

No. CVE-2021-40633 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-40633?

CVE-2021-40633 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2021-40633?

CVE-2021-40633 has an EPSS score of 1.53% (72th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-40633?

Upgrade giflib on debian 13 to 5.2.2-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-40633

HIGHEPSS 72th pctl

8.8

CVSS v3

NVD

Description

A memory leak (out-of-memory) in gif2rgb in util/gif2rgb.c in giflib 5.1.4 allows remote attackers trigger an out of memory exception or denial of service via a gif format file.

CWE-401Missing Release of Memory (Memory Leak)

How to fix

Remediation Available

giflibDebian

Fixed in:5.2.2-1CVE-2021-40633

giflibUbuntu

Fixed in:5.1.4-0.3~16.04.1+esm1USN-6824-1

Fixed in:5.1.4-2ubuntu0.1+esm1USN-6824-1

Fixed in:5.1.9-1ubuntu0.1USN-6824-1

Fixed in:5.1.9-2ubuntu0.1USN-6824-1

Fixed in:5.2.1-2.5ubuntu0.1USN-6824-1

giflib-toolsUbuntu

Fixed in:5.1.4-0.3~16.04.1+esm1USN-6824-1

Fixed in:5.1.4-2ubuntu0.1+esm1USN-6824-1

Fixed in:5.1.9-1ubuntu0.1USN-6824-1

Fixed in:5.1.9-2ubuntu0.1USN-6824-1

Fixed in:5.2.1-2.5ubuntu0.1USN-6824-1

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

1.53%probability of exploitation in 30 days

72ndpercentile

Elevated risk: more likely to be exploited than 72% of all known CVEs.

References

Exploit1

sourceforge.net

Related Vulnerabilities

Other CWE-401 (Missing Release of Memory (Memory Leak)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-13934	High	7.5	64%	-	Fix
CVE-2016-6304	High	7.5	63%	-	Fix
CVE-2019-12265	Medium	5.3	55%	-	Fix
CVE-2001-0136	Medium	5.0	45%	-	-
CVE-2016-4232	High	7.5	36%	-	-
CVE-2001-0543	Medium	5.0	21%	-	-

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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 2024-11-21.