Use After Free in Ytnef Project
CVE-2021-3403
In ytnef 1.9.3, the TNEFSubjectHandler function in lib/ytnef.c allows remote attackers to cause a denial-of-service (and potentially code execution) due to a double free which can be triggered via a crafted file.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.018 (77.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000
Affected products
- Ytnef Project — versions 1.9.3
- Fedoraproject Fedora — versions 33
- Red Hat Enterprise Linux — versions 7.0
- Ytnef — versions All versions
Weakness classification (CWE)
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- github.com/Yeraze/ytnef/issues/85 (Exploit, Third Party Advisory, Issue Tracking)
Frequently asked questions
- What is CVE-2021-3403?
- CVE-2021-3403 is a high-severity vulnerability in Ytnef Project, classified under Use After Free. CVSS score: 7.8/10. Published 2021-03-04.
- How severe is CVE-2021-3403?
- High severity. CVSS v3 base score is 7.8 out of 10.