CVE-2005-2455: Greasemonkey before 0.3.5 allows remote web servers to (1) read arbitrary files via a GET request to a file://

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MEDIUM 5.0DOWNGRADE

CVE-2005-2455 is a medium-severity flaw (CVSS 5.0) affecting greasemonkey. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Greasemonkey before 0.3.5 allows remote web servers to (1) read arbitrary files via a GET request to a file:// URL in the GM_xmlhttpRequest API function, (2) list installed scripts using GM_scripts, or obtain sensitive information via (3) GM_setValue and GM_getValue.

Why this priority

EPSS top 5%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	8.5% (top 5%)
CISA exploited list	No
Published	2005-08-04
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: greasemonkey

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2005-08-04 04:00 UTCPublished CVE record published
2026-06-16 22:14 UTCUpdated Record last modified

greasemonkey greasemonkey DOWNGRADE

Affected: 0.3.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.3.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.3.3 (Debian / Ubuntu)

apt-cache madison greasemonkey sudo apt install greasemonkey=<VERSION_BEFORE_0.3.3> sudo apt-mark hold greasemonkey

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

dnf --showduplicates list greasemonkey sudo dnf downgrade greasemonkey-<VERSION_BEFORE_0.3.3> sudo dnf versionlock add greasemonkey

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Greasemonkey 0.3.3 - Multiple Remote Information Disclosure Vulnerabilities

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-2005-2455?

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

Is CVE-2005-2455 being exploited?

CVE-2005-2455 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-2005-2455 affect?

CVE-2005-2455 affects greasemonkey. Severity is medium (CVSS 5.0). Greasemonkey before 0.3.5 allows remote web servers to (1) read arbitrary files via a GET request to a file:// URL in the GM_xmlhttpRequest API function, (2) list installed scripts using GM_scripts, or obtain sensitive information via (3) G

How urgent is CVE-2005-2455?

Priority 46/100. EPSS top 5%: very likely to be exploited; Public exploit reference

References

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