{"cve":"CVE-2021-3404","nvd":{"published":"2021-03-04T22:15:14.657","modified":"2026-06-17T04:05:01.970","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-787","CWE-119"],"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"],"products":["fedoraproject:fedora","redhat:enterprise_linux","ytnef_project:ytnef"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2021-3404","score":0.01939,"percentile":0.80101,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}