CVE-2009-0777
Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey before 1.1.15 decode...
5.8 Medium
Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey before 1.1.15 decode invisible characters when they are displayed in the location bar, which causes an incorrect address to be displayed and makes it easier for remote attackers to spoof URLs and conduct phishing attacks.
Exploit likelihood
1.50%Down 2.4 points since Feb 4, 2022
What each source reports
NVD Score used
Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey before 1.1.15 decode invisible characters when they are displayed in the location bar, which causes an incorrect address to be displayed and makes it easier for remote attackers to spoof URLs and conduct phishing attacks.
- Record
CVE-2009-0777- CVSS 2.0
- 5.8 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:P - Weakness
- CWE-20
- Updated
- 2026-11-02
CVE List No score
Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey before 1.1.15 decode invisible characters when they are displayed in the location bar, which causes an incorrect address to be displayed and makes it easier for remote attackers to spoof URLs and conduct phishing attacks.
- Record
CVE-2009-0777- Updated
- 2026-11-02
EUVDEUVD-2009-0777 No score
Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey before 1.1.15 decode invisible characters when they are displayed in the location bar, which causes an incorrect address to be displayed and makes it easier for remote attackers to spoof URLs and conduct phishing attacks.
- Record
EUVD-2009-0777- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-9q9q-525p-x46x No score
Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey before 1.1.15 decode...
Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey before 1.1.15 decode invisible characters when they are displayed in the location bar, which causes an incorrect address to be displayed and makes it easier for remote attackers to spoof URLs and conduct phishing attacks.
- Record
GHSA-9q9q-525p-x46x- Weakness
- CWE-20
- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:10071-1 No score
MozillaFirefox-50.1.0-1.1 on GA media
These are all security issues fixed in the MozillaFirefox-50.1.0-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:10071-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:14572-1 No score
firefox-esr-128.5.1-1.1 on GA media
These are all security issues fixed in the firefox-esr-128.5.1-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:14572-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
firefoxRed Hat:enterprise_linux:4::as From an advisory covering 8 CVEs |
before 0:3.0.7-1.el4 | 0:3.0.7-1.el4 |
firefox-debuginfoRed Hat:enterprise_linux:4::as From an advisory covering 8 CVEs |
before 0:3.0.7-1.el4 | 0:3.0.7-1.el4 |
firefoxRed Hat:enterprise_linux:4::desktop From an advisory covering 8 CVEs |
before 0:3.0.7-1.el4 | 0:3.0.7-1.el4 |
firefox-debuginfoRed Hat:enterprise_linux:4::desktop From an advisory covering 8 CVEs |
before 0:3.0.7-1.el4 | 0:3.0.7-1.el4 |
firefoxRed Hat:enterprise_linux:4::es From an advisory covering 8 CVEs |
before 0:3.0.7-1.el4 | 0:3.0.7-1.el4 |
firefox-debuginfoRed Hat:enterprise_linux:4::es From an advisory covering 8 CVEs |
before 0:3.0.7-1.el4 | 0:3.0.7-1.el4 |
firefoxRed Hat:enterprise_linux:4::ws From an advisory covering 8 CVEs |
before 0:3.0.7-1.el4 | 0:3.0.7-1.el4 |
firefox-debuginfoRed Hat:enterprise_linux:4::ws From an advisory covering 8 CVEs |
before 0:3.0.7-1.el4 | 0:3.0.7-1.el4 |
xulrunnerRed Hat:enterprise_linux:5::client_workstation From an advisory covering 8 CVEs |
before 0:1.9.0.7-1.el5 | 0:1.9.0.7-1.el5 |
xulrunner-debuginfoRed Hat:enterprise_linux:5::client_workstation From an advisory covering 8 CVEs |
before 0:1.9.0.7-1.el5 | 0:1.9.0.7-1.el5 |
Show 14 moreShow less
| Package | Affected | Fixed |
|---|---|---|
xulrunner-develRed Hat:enterprise_linux:5::client_workstation From an advisory covering 8 CVEs |
before 0:1.9.0.7-1.el5 | 0:1.9.0.7-1.el5 |
xulrunner-devel-unstableRed Hat:enterprise_linux:5::client_workstation From an advisory covering 8 CVEs |
before 0:1.9.0.7-1.el5 | 0:1.9.0.7-1.el5 |
firefoxRed Hat:enterprise_linux:5::client From an advisory covering 8 CVEs |
before 0:3.0.7-1.el5 | 0:3.0.7-1.el5 |
firefox-debuginfoRed Hat:enterprise_linux:5::client From an advisory covering 8 CVEs |
before 0:3.0.7-1.el5 | 0:3.0.7-1.el5 |
xulrunnerRed Hat:enterprise_linux:5::client From an advisory covering 8 CVEs |
before 0:1.9.0.7-1.el5 | 0:1.9.0.7-1.el5 |
xulrunner-debuginfoRed Hat:enterprise_linux:5::client From an advisory covering 8 CVEs |
before 0:1.9.0.7-1.el5 | 0:1.9.0.7-1.el5 |
firefoxRed Hat:enterprise_linux:5::server From an advisory covering 8 CVEs |
before 0:3.0.7-1.el5 | 0:3.0.7-1.el5 |
firefox-debuginfoRed Hat:enterprise_linux:5::server From an advisory covering 8 CVEs |
before 0:3.0.7-1.el5 | 0:3.0.7-1.el5 |
xulrunnerRed Hat:enterprise_linux:5::server From an advisory covering 8 CVEs |
before 0:1.9.0.7-1.el5 | 0:1.9.0.7-1.el5 |
xulrunner-debuginfoRed Hat:enterprise_linux:5::server From an advisory covering 8 CVEs |
before 0:1.9.0.7-1.el5 | 0:1.9.0.7-1.el5 |
xulrunner-develRed Hat:enterprise_linux:5::server From an advisory covering 8 CVEs |
before 0:1.9.0.7-1.el5 | 0:1.9.0.7-1.el5 |
xulrunner-devel-unstableRed Hat:enterprise_linux:5::server From an advisory covering 8 CVEs |
before 0:1.9.0.7-1.el5 | 0:1.9.0.7-1.el5 |
MozillaFirefoxopenSUSE:Tumbleweed From an advisory covering 899 CVEs |
before 50.1.0-1.1 | 50.1.0-1.1 |
firefox-esropenSUSE:Tumbleweed From an advisory covering 1860 CVEs |
before 128.5.1-1.1 | 128.5.1-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2009-0777 is a medium vulnerability (CVSS 5.8) in Mozilla Firefox, published March 5, 2009. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.50%, the 74th percentile. No source names a fixed version.
References
redhat.com/support/errata/RHSA-2009-0315.html
mozilla.org/security/announce/2009/mfsa2009-11.html
lists.opensuse.org/opensuse-security-announce/2009-03/msg00002.html
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11222
vupen.com/english/advisories/2009/0632
Show 194 moreShow less
secunia.com/advisories/34140
securitytracker.com/alerts/2009/Mar/1021799.html
support.avaya.com/elmodocs2/security/ASA-2009-069.htm
exchange.xforce.ibmcloud.com/vulnerabilities/49087
mandriva.com/security/advisories?name=MDVSA-2009:075
securityfocus.com/bid/33990
bugzilla.mozilla.org/show_bug.cgi?id=452979
nvd.nist.gov/vuln/detail/CVE-2009-0777
github.com/advisories/GHSA-9q9q-525p-x46x
access.redhat.com/errata/RHSA-2009:0315
bugzilla.redhat.com/show_bug.cgi?id=486355
security.access.redhat.com/data/csaf/v2/advisories/2009/rhsa-2009_0315.json
cve.org/CVERecord?id=CVE-2009-0040
suse.com/security/cve/CVE-2008-5913
This page doesn't list everything
Left out here: 1,911 references. The JSON record has them.