CVE-2017-6395: An issue was discovered in HashOver 2.0

Routine

MEDIUM 6.1DOWNGRADE

CVE-2017-6395 is a medium-severity flaw (CVSS 6.1) affecting hashover. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in HashOver 2.0. The vulnerability exists due to insufficient filtration of user-supplied data passed to the 'hashover/scripts/widget-output.php' URL. An attacker could execute arbitrary HTML and script code in a browser in the context of the vulnerable website.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-79
Published	2017-03-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: hashover project

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

Am I affected?

Timeline

2017-03-02 06:59 UTCPublished CVE record published
2026-06-17 01:22 UTCUpdated Record last modified

hashover project hashover DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy hashover || rpm -q hashover || hashover --version

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison hashover sudo apt install hashover=<VERSION_BEFORE_2.0> sudo apt-mark hold hashover

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

dnf --showduplicates list hashover sudo dnf downgrade hashover-<VERSION_BEFORE_2.0> sudo dnf versionlock add hashover

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-2017-6395?

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

Is CVE-2017-6395 being exploited?

CVE-2017-6395 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-2017-6395 affect?

CVE-2017-6395 affects hashover. Severity is medium (CVSS 6.1). An issue was discovered in HashOver 2.0. The vulnerability exists due to insufficient filtration of user-supplied data passed to the 'hashover/scripts/widget-output.php' URL. An attacker could execute arbitrary HTML and script code in a bro

How urgent is CVE-2017-6395?

Priority 34/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

References

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