What’s Vulnerable › Vulnerabilities

CVE-2021-3404

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-03-04 · updated 2026-06-17
• Weakness: CWE-119

Description

In ytnef 1.9.3, the SwapWord function in lib/ytnef.c allows remote attackers to cause a denial-of-service (and potentially code execution) due to a heap buffer overflow which can be triggered via a crafted file.

Affected products

• Fedoraproject Fedora: 33
• Red Hat Enterprise Linux: 7.0
• ytnef: 1.9.3

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1926965
• https://github.com/Yeraze/ytnef/issues/86
• https://bugzilla.redhat.com/show_bug.cgi?id=1926965
• https://github.com/Yeraze/ytnef/issues/86

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