firefox/thunderbird/seamonkey: privacy compromise via DNS prefetching (local HTML files)
Published Jan 29, 2010
5.0
MEDIUMCVSS 2.0
EPSS 1.03%
Description
Mozilla Necko, as used in Firefox, SeaMonkey, and other applications, performs DNS prefetching of domain names contained in links within local HTML documents, which makes it easier for remote attackers to determine the network location of the application's user by logging DNS requests. NOTE: the vendor disputes the significance of this issue, stating "I don't think we necessarily need to worry about that case."
Affected products
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the versions of Firefox, Thunderbird, or Seamonkey as shipped with Red Hat Enterprise Linux 3, 4, or 5.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 1.03% (0.01025) | 62.30th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.03% (0.01025) | 58.93th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.23% (0.00232) | 43.99th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.27% (0.00269) | 68.69th | v3 (v2023.03.01) |
| May 10, 2024 | 0.21% (0.00207) | 58.47th | v3 (v2023.03.01) |
| Apr 25, 2024 | 0.19% (0.00194) | 56.43th | v3 (v2023.03.01) |
| Mar 15, 2024 | 0.18% (0.00179) | 54.10th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.16% (0.00164) | 51.74th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.27% (0.00269) | 62.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.05% (0.01055) | 52.13th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.05% (0.01055) | 50.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.05% (0.01055) | 48.43th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.05% (0.01055) | 27.52th | v2 (v2022.01.01) |
References (6)
- https://access.redhat.com/security/cve/CVE-2009-4630 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=453403 x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=492196 x_refsource_MISC
- https://bugzilla.redhat.com/show_bug.cgi?id=560134 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2009-4630
- https://www.cve.org/CVERecord?id=CVE-2009-4630
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2009-4630 | Vendor Advisory | |
| https://bugzilla.mozilla.org/show_bug.cgi?id=453403 | x_refsource_MISC | |
| https://bugzilla.mozilla.org/show_bug.cgi?id=492196 | x_refsource_MISC | |
| https://bugzilla.redhat.com/show_bug.cgi?id=560134 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2009-4630 | ||
| https://www.cve.org/CVERecord?id=CVE-2009-4630 |
Change history (0)
No recorded changes yet.