CVE-2019-9673: Freenet 1483 has a MIME type bypass that allows arbitrary JavaScript execution via a crafted Freenet URI.

This month

HIGH 8.8DOWNGRADE

CVE-2019-9673 is a high-severity flaw (CVSS 8.8) affecting freenet. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Freenet 1483 has a MIME type bypass that allows arbitrary JavaScript execution via a crafted Freenet URI.

Why this priority

High severity
EPSS top 9%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	4.0% (top 9%)
CISA exploited list	No
Weakness	CWE-19
Published	2019-06-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: freenetproject

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

Am I affected?

Timeline

2019-06-05 16:29 UTCPublished CVE record published
2026-06-17 02:44 UTCUpdated Record last modified

freenetproject freenet DOWNGRADE

Affected: 0.7.5 1472 · 0.7.5 1473 · 0.7.5 1475 · 0.7.5 1476 · 0.7.5 1477 · 0.7.5 1479 · 0.7.5 1480 · 0.7.5 1483

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.7.5

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.7.5 (Debian / Ubuntu)

apt-cache madison freenet sudo apt install freenet=<VERSION_BEFORE_0.7.5> sudo apt-mark hold freenet

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

dnf --showduplicates list freenet sudo dnf downgrade freenet-<VERSION_BEFORE_0.7.5> sudo dnf versionlock add freenet

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-2019-9673?

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

Is CVE-2019-9673 being exploited?

CVE-2019-9673 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-2019-9673 affect?

CVE-2019-9673 affects freenet. Severity is high (CVSS 8.8). Freenet 1483 has a MIME type bypass that allows arbitrary JavaScript execution via a crafted Freenet URI.

How urgent is CVE-2019-9673?

Priority 58/100. High severity; EPSS top 9%: very likely to be exploited; Public exploit reference

References

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