What is CVE-2017-6303?

CVE-2017-6303 is a high-severity vulnerability in Ytnef Project, classified under Integer Overflow or Wraparound. CVSS score: 7.8/10. Published 2017-02-24.

How severe is CVE-2017-6303?

High severity. CVSS v3 base score is 7.8 out of 10.

Integer overflow in Ytnef Project

CVE-2017-6303

An issue was discovered in ytnef before 1.9.1. This is related to a patch described as "6 of 9. Invalid Write and Integer Overflow."

Vulnerability class: Integer Overflow

Published 2017-02-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (68.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Ytnef Project
Debian Linux — versions 8.0, 9.0

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

www.securityfocus.com/bid/96423 (VDB Entry, Third Party Advisory, vdb-entry)
www.openwall.com/lists/oss-security/2017/02/15/4 (Patch, Mailing List, Third Party Advisory)
github.com/Yeraze/ytnef/pull/27 (Patch, Third Party Advisory, Issue Tracking)
www.debian.org/security/2017/dsa-3846 (vendor-advisory, Third Party Advisory)
www.x41-dsec.de/lab/advisories/x41-2017-002-ytnef/ (Patch, Third Party Advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)

Frequently asked questions

What is CVE-2017-6303?: CVE-2017-6303 is a high-severity vulnerability in Ytnef Project, classified under Integer Overflow or Wraparound. CVSS score: 7.8/10. Published 2017-02-24.
How severe is CVE-2017-6303?: High severity. CVSS v3 base score is 7.8 out of 10.