What is CVE-2017-8803?

CVE-2017-8803 is a high-severity vulnerability in Mh-Nexus Hex Editor, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2017-07-05.

How severe is CVE-2017-8803?

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

Buffer overflow in Mh-Nexus Hex Editor

CVE-2017-8803

Notepad++ 7.3.3 (32-bit) with Hex Editor Plugin v0.9.5 might allow user-assisted attackers to execute code via a crafted file, because of a "Data from Faulting Address controls Code Flow" issue. One threat model is a victim who obtains an untrusted crafted file from a remote location and issues several user-defined commands.

Vulnerability class: Buffer Overflow

Published 2017-07-05 · last modified 2026-06-17.

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: 0.016 (75.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Mh-Nexus Hex Editor — versions 0.9.5
Notepad-Plus-Plus Notepad\+\+ — versions 7.3.3

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

github.com/wlinzi/security_advisories/tree/master/CVE-2017-8803 (Third Party Advisory)

Frequently asked questions

What is CVE-2017-8803?: CVE-2017-8803 is a high-severity vulnerability in Mh-Nexus Hex Editor, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2017-07-05.
How severe is CVE-2017-8803?: High severity. CVSS v3 base score is 7.8 out of 10.