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

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HIGH 7.8DOWNGRADE

CVE-2017-8803 is a high-severity flaw (CVSS 7.8) affecting hex editor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-119
Published	2017-07-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mh-nexus

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-07-05 20:29 UTCPublished CVE record published
2026-06-17 01:26 UTCUpdated Record last modified

mh-nexus hex editor DOWNGRADE

Affected: 0.9.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9.5

1. Check installed version

apt-cache policy hex-editor || rpm -q hex-editor || hex-editor --version

2. No fixed release: DOWNGRADE to a release before 0.9.5 (Debian / Ubuntu)

apt-cache madison hex-editor sudo apt install hex-editor=<VERSION_BEFORE_0.9.5> sudo apt-mark hold hex-editor

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list hex-editor sudo dnf downgrade hex-editor-<VERSION_BEFORE_0.9.5> sudo dnf versionlock add hex-editor

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-8803?

hex editor: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-8803 being exploited?

CVE-2017-8803 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-8803 affect?

CVE-2017-8803 affects hex editor. Severity is high (CVSS 7.8). 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 u

How urgent is CVE-2017-8803?

Priority 46/100. High severity

Software pages

Notepad++ vulnerabilities

References

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