What is CVE-2017-8911?

CVE-2017-8911 is a critical-severity vulnerability in Tnef Project, classified under Integer Underflow. CVSS score: 9.8/10. Published 2017-05-12.

How severe is CVE-2017-8911?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Integer overflow in Tnef Project

CVE-2017-8911

An integer underflow has been identified in the unicode_to_utf8() function in tnef 1.4.14. This might lead to invalid write operations, controlled by an attacker.

Published 2017-05-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.019 (79.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Tnef Project — versions 1.4.14

Weakness classification (CWE)

CWE-191 — Integer Underflow

References

github.com/verdammelt/tnef/issues/23 (Patch, Third Party Advisory, Issue Tracking)
www.debian.org/security/2017/dsa-3869 (vendor-advisory)
security.gentoo.org/glsa/201708-02 (vendor-advisory)

Frequently asked questions

What is CVE-2017-8911?: CVE-2017-8911 is a critical-severity vulnerability in Tnef Project, classified under Integer Underflow. CVSS score: 9.8/10. Published 2017-05-12.
How severe is CVE-2017-8911?: Critical severity. CVSS v3 base score is 9.8 out of 10.