What’s Vulnerable › Vulnerabilities

CVE-2021-3504

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-11 · updated 2026-06-17
• Weakness: CWE-125

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.

Affected products

• Debian Linux: 9.0
• Fedoraproject Fedora: 34
• Red Hat Enterprise Linux: 6.0, 7.0, 8.0
• RedHat Hivex: before 1.3.20 — fixed in 1.3.20

How to fix

Upgrade to a fixed version: RedHat Hivex 1.3.20. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1949687
• https://lists.debian.org/debian-lts-announce/2021/05/msg00011.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A5BNKNVYFL36P2GBEB5O36LHFRYU575H/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BQXTEACRWYAZVNEOIWIYUFGG4GOXSQ22/
• https://bugzilla.redhat.com/show_bug.cgi?id=1949687
• https://lists.debian.org/debian-lts-announce/2021/05/msg00011.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A5BNKNVYFL36P2GBEB5O36LHFRYU575H/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BQXTEACRWYAZVNEOIWIYUFGG4GOXSQ22/

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