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CVE-2009-3987

23
FAUCET Score

CVE-2009-3987 is an information disclosure vulnerability affecting Mozilla Firefox and SeaMonkey. It allows remote attackers to determine installed software by observing differing exception messages when calling the GeckoActiveXObject function with various COM object ProgIDs. With a CVSS score of 7.8 (High), this vulnerability has a network attack vector, low attack complexity, and a complete confidentiality impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.0.15CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
0.1CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:0.1:*:*:*:*:*:*:*
0.2CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:0.2:*:*:*:*:*:*:*
0.3CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:0.3:*:*:*:*:*:*:*
0.4CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:0.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.8HIGH

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

Confidentiality Impact
COMPLETE
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.62%
Probability of exploitation in next 30 days
EPSS Percentile
73.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0162 is in the 56th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 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

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2009-3987Low

Mozilla GeckoActiveXObject exception messages can be used to enumerate installed COM objects

Dec 15, 2009

References

bugzilla.mozilla.org / show_bug.cgi
bugzilla.redhat.com / show_bug.cgi
secunia.com / advisories/37699
Vendor Advisory
secunia.com / advisories/37785
Vendor Advisory
securitytracker.com / id
Patch
securitytracker.com / id
Patch
exchange.xforce.ibmcloud.com / vulnerabilities/54798
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7958
mozilla.org / security/announce/2009/mfsa2009-71.html
Vendor Advisory
securityfocus.com / bid/37349
securityfocus.com / bid/37360
vupen.com / english/advisories/2009/3547
PatchVendor Advisory