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CVE-2009-4629

15
FAUCET Score

CVE-2009-4629 describes a privacy vulnerability in Mozilla Necko, affecting applications like Thunderbird and SeaMonkey. The flaw allows DNS prefetching even in mail or editor contexts, enabling remote attackers to infer a user's network location by logging DNS requests triggered by content such as plain text emails. This vulnerability has a CVSS score of 5.0, indicating a low-complexity attack with potential for partial confidentiality impact, but no integrity or availability impact. There is no evidence of active exploitation, nor is exploit code publicly available, and the CVE has received minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
3.0.1CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:3.0.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
0.93%
Probability of exploitation in next 30 days
EPSS Percentile
57.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0093 is in the 36th percentile among its peer group of 23,725 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Vendor Advisories (1)

redhatCVE-2009-4629Moderate

thunderbird/seamonkey: privacy compromise via DNS prefetching

May 9, 2009

References

bugzilla.mozilla.org / show_bug.cgi
secure.grepular.com / DNS_Prefetch_Exposure_on_Thunderbird_and_Webmail