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CVE-2009-1836

Mozilla Firefox before 3.0.11, Thunderbird before 2.0.0.22, and SeaMonkey before 1.1.17 use the...

6.8 Medium

Mozilla Firefox before 3.0.11, Thunderbird before 2.0.0.22, and SeaMonkey before 1.1.17 use the HTTP Host header to determine the context of a document provided in a non-200 CONNECT response from a proxy server, which allows man-in-the-middle attackers to execute arbitrary web script by modifying this CONNECT response, aka an "SSL tampering" attack.

Exploit likelihood

2.03%Down 0.7 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 6.8

Mozilla Firefox before 3.0.11, Thunderbird before 2.0.0.22, and SeaMonkey before 1.1.17 use the HTTP Host header to determine the context of a document provided in a non-200 CONNECT response from a proxy server, which allows man-in-the-middle attackers to execute arbitrary web script by modifying this CONNECT response, aka an "SSL tampering" attack.

Record
CVE-2009-1836
CVSS 2.0
6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness
CWE-287
Updated
2026-11-02
CVE List No score

Mozilla Firefox before 3.0.11, Thunderbird before 2.0.0.22, and SeaMonkey before 1.1.17 use the HTTP Host header to determine the context of a document provided in a non-200 CONNECT response from a proxy server, which allows man-in-the-middle attackers to execute arbitrary web script by modifying this CONNECT response, aka an "SSL tampering" attack.

Record
CVE-2009-1836
Updated
2026-11-02
EUVDEUVD-2009-1831 No score

Mozilla Firefox before 3.0.11, Thunderbird before 2.0.0.22, and SeaMonkey before 1.1.17 use the HTTP Host header to determine the context of a document provided in a non-200 CONNECT response from a proxy server, which allows man-in-the-middle attackers to execute arbitrary web script by modifying this CONNECT response, aka an "SSL tampering" attack.

Record
EUVD-2009-1831
Updated
2026-11-03
GitHub AdvisoriesGHSA-xw48-x32w-4m9r No score

Mozilla Firefox before 3.0.11, Thunderbird before 2.0.0.22, and SeaMonkey before 1.1.17 use the...

Mozilla Firefox before 3.0.11, Thunderbird before 2.0.0.22, and SeaMonkey before 1.1.17 use the HTTP Host header to determine the context of a document provided in a non-200 CONNECT response from a proxy server, which allows man-in-the-middle attackers to execute arbitrary web script by modifying this CONNECT response, aka an "SSL tampering" attack.

Record
GHSA-xw48-x32w-4m9r
Weakness
CWE-287
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
xulrunner
Debian:5.0
From an advisory covering 12 CVEs
 before 1.9.0.11-0lenny1, plus listed versions
1.9.0.10-11.9.0.5-11.9.0.6-11.9.0.7-0lenny11.9.0.7-0lenny2
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1.9.0.7-11.9.0.8-11.9.0.9-0lenny21.9.0.9-1
1.9.0.11-0lenny1
icedove
Debian:5.0
From an advisory covering 19 CVEs
 before 2.0.0.22-0lenny1, plus listed versions
2.0.0.19-12.0.0.19-1+kbsd
2.0.0.22-0lenny1
firefox
Red Hat:enterprise_linux:4::as
From an advisory covering 11 CVEs
 before 0:3.0.11-4.el4
0:3.0.11-4.el4
firefox-debuginfo
Red Hat:enterprise_linux:4::as
From an advisory covering 11 CVEs
 before 0:3.0.11-4.el4
0:3.0.11-4.el4
firefox
Red Hat:enterprise_linux:4::desktop
From an advisory covering 11 CVEs
 before 0:3.0.11-4.el4
0:3.0.11-4.el4
firefox-debuginfo
Red Hat:enterprise_linux:4::desktop
From an advisory covering 11 CVEs
 before 0:3.0.11-4.el4
0:3.0.11-4.el4
firefox
Red Hat:enterprise_linux:4::es
From an advisory covering 11 CVEs
 before 0:3.0.11-4.el4
0:3.0.11-4.el4
firefox-debuginfo
Red Hat:enterprise_linux:4::es
From an advisory covering 11 CVEs
 before 0:3.0.11-4.el4
0:3.0.11-4.el4
firefox
Red Hat:enterprise_linux:4::ws
From an advisory covering 11 CVEs
 before 0:3.0.11-4.el4
0:3.0.11-4.el4
firefox-debuginfo
Red Hat:enterprise_linux:4::ws
From an advisory covering 11 CVEs
 before 0:3.0.11-4.el4
0:3.0.11-4.el4
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Affected packages
PackageAffectedFixed
xulrunner
Red Hat:enterprise_linux:5::client_workstation
From an advisory covering 11 CVEs
 before 0:1.9.0.11-3.el5_3
0:1.9.0.11-3.el5_3
xulrunner-debuginfo
Red Hat:enterprise_linux:5::client_workstation
From an advisory covering 11 CVEs
 before 0:1.9.0.11-3.el5_3
0:1.9.0.11-3.el5_3
xulrunner-devel
Red Hat:enterprise_linux:5::client_workstation
From an advisory covering 11 CVEs
 before 0:1.9.0.11-3.el5_3
0:1.9.0.11-3.el5_3
xulrunner-devel-unstable
Red Hat:enterprise_linux:5::client_workstation
From an advisory covering 11 CVEs
 before 0:1.9.0.11-3.el5_3
0:1.9.0.11-3.el5_3
firefox
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:3.0.11-2.el5_3
0:3.0.11-2.el5_3
firefox-debuginfo
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:3.0.11-2.el5_3
0:3.0.11-2.el5_3
xulrunner
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:1.9.0.11-3.el5_3
0:1.9.0.11-3.el5_3
xulrunner-debuginfo
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:1.9.0.11-3.el5_3
0:1.9.0.11-3.el5_3
firefox
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:3.0.11-2.el5_3
0:3.0.11-2.el5_3
firefox-debuginfo
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:3.0.11-2.el5_3
0:3.0.11-2.el5_3
xulrunner
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:1.9.0.11-3.el5_3
0:1.9.0.11-3.el5_3
xulrunner-debuginfo
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:1.9.0.11-3.el5_3
0:1.9.0.11-3.el5_3
xulrunner-devel
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:1.9.0.11-3.el5_3
0:1.9.0.11-3.el5_3
xulrunner-devel-unstable
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:1.9.0.11-3.el5_3
0:1.9.0.11-3.el5_3
thunderbird
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:2.0.0.22-2.el5_3
0:2.0.0.22-2.el5_3
thunderbird-debuginfo
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:2.0.0.22-2.el5_3
0:2.0.0.22-2.el5_3
thunderbird
Red Hat:rhel_productivity:5
From an advisory covering 11 CVEs
 before 0:2.0.0.22-2.el5_3
0:2.0.0.22-2.el5_3
thunderbird-debuginfo
Red Hat:rhel_productivity:5
From an advisory covering 11 CVEs
 before 0:2.0.0.22-2.el5_3
0:2.0.0.22-2.el5_3

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2009-1836 is a medium vulnerability (CVSS 6.8) in Mozilla Firefox, published June 12, 2009. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.03%, the 81st percentile. No source names a fixed version.

References

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