Is CVE-2021-3504 in the CISA KEV catalog?

No. CVE-2021-3504 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3504?

CVE-2021-3504 has a CVSS v3 base score of 5.4 (MEDIUM).

What is the EPSS score for CVE-2021-3504?

CVE-2021-3504 has an EPSS score of 1.92% (77th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3504?

Upgrade hivex on debian 11 to 1.3.20-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3504

MEDIUMEPSS 77th pctl

5.4

CVSS v3

NVD

Description

A flaw was found in the hivex library in versions before 1.3.20. It is caused due to a lack of bounds check within the hivex_open function. An attacker could input a specially crafted Windows Registry (hive) file which would cause hivex to read memory beyond its normal bounds or cause the program to crash. The highest threat from this vulnerability is to system availability.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

hivexDebian

Fixed in:1.3.20-1CVE-2021-3504

hivexUbuntu

Fixed in:1.3.9-2ubuntu0.1~esm1USN-5148-2

Fixed in:1.3.13-1ubuntu0.1~esm1USN-5148-2

Fixed in:1.3.15-1ubuntu0.1USN-5148-1

Fixed in:1.3.18-2ubuntu0.1USN-5148-1

libhivex-binUbuntu

Fixed in:1.3.9-2ubuntu0.1~esm1USN-5148-2

Fixed in:1.3.13-1ubuntu0.1~esm1USN-5148-2

Fixed in:1.3.15-1ubuntu0.1USN-5148-1

Fixed in:1.3.18-2ubuntu0.1USN-5148-1

libhivex0Ubuntu

Fixed in:1.3.9-2ubuntu0.1~esm1USN-5148-2

Fixed in:1.3.13-1ubuntu0.1~esm1USN-5148-2

Fixed in:1.3.15-1ubuntu0.1USN-5148-1

Fixed in:1.3.18-2ubuntu0.1USN-5148-1

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

ConfidentialityLow

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

1.92%probability of exploitation in 30 days

77thpercentile

Elevated risk: more likely to be exploited than 77% of all known CVEs.

References

Patch1

bugzilla.redhat.com

Third-Party Advisory1

lists.debian.org

Other references2

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	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 2024-11-21.