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CVE-2009-4100

24
FAUCET Score

CVE-2009-4100 describes a critical vulnerability in the Yoono extension for Firefox, versions prior to 6.1.1. This flaw allows user-assisted remote attackers to execute arbitrary commands and conduct cross-domain scripting attacks through DOM event handlers due to the extension performing operations with elevated chrome privileges. With a CVSS score of 9.3, this vulnerability is highly severe, requiring medium attack complexity but leading to complete compromise of confidentiality, integrity, and availability. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 6.1.0CPE matchmatch criteria
cpe:2.3:a:yoono:yoono:*:*:*:*:*:*:*:*
2.0.2.474CPE matchmatch criteria
cpe:2.3:a:yoono:yoono:2.0.2.474:*:*:*:*:*:*:*
2.0.3.564CPE matchmatch criteria
cpe:2.3:a:yoono:yoono:2.0.3.564:*:*:*:*:*:*:*
2.0.4.641CPE matchmatch criteria
cpe:2.3:a:yoono:yoono:2.0.4.641:*:*:*:*:*:*:*
2.1.0.743CPE matchmatch criteria
cpe:2.3:a:yoono:yoono:2.1.0.743:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

9.3HIGH

AV:N/AC:M/Au:N/C:C/I:C/A:C

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.87%
Probability of exploitation in next 30 days
EPSS Percentile
89.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0387 is in the 51st percentile among its peer group of 8,914 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

addons.mozilla.org / en-US/firefox/addons/versions/1833
secunia.com / advisories/37468
Vendor Advisory
exchange.xforce.ibmcloud.com / vulnerabilities/54417
net-security.org / secworld.php
securityfocus.com / bid/37123
vupen.com / english/advisories/2009/3326
Vendor Advisory