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CVE-2009-0777

16
FAUCET Score

CVE-2009-0777 describes a URL spoofing vulnerability in Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey before 1.1.15. The flaw allows remote attackers to display an incorrect address in the location bar by decoding invisible characters, facilitating phishing attacks. This vulnerability has a CVSS score of 5.8, indicating a medium severity with network access and medium attack complexity, potentially leading to partial integrity and availability impacts. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.0.6CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
1.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:1.0:*:*:*:*:*:*:*
1.0.1CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:1.0.1:*:*:*:*:*:*:*
1.0.2CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:1.0.2:*:*:*:*:*:*:*
1.0.3CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:1.0.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.8MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
4.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.50%
Probability of exploitation in next 30 days
EPSS Percentile
71.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0150 is in the 45th percentile among its peer group of 19,958 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, 0.0 Bluesky, 0.0 Mastodon, and 0.2 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

Patch Available

Vendor Patches (4)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: firefox-0:3.0.7-1.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: firefox-0:3.0.7-1.el5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xulrunner-0:1.9.0.7-1.el5
View patch
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2009-0777Low

Firefox URL spoofing with invisible control characters

Mar 4, 2009

References

lists.opensuse.org / opensuse-security-announce/2009-03/msg00002.html
bugzilla.mozilla.org / show_bug.cgi
secunia.com / advisories/34140
Vendor Advisory
secunia.com / advisories/34145
Vendor Advisory
secunia.com / advisories/34272
Vendor Advisory
securitytracker.com / alerts/2009/Mar/1021799.html
exchange.xforce.ibmcloud.com / vulnerabilities/49087
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11222
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6039
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6157
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6229
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7435
support.avaya.com / elmodocs2/security/ASA-2009-069.htm
support.avaya.com / japple/css/japple
mandriva.com / security/advisories
mozilla.org / security/announce/2009/mfsa2009-11.html
Vendor Advisory
redhat.com / support/errata/RHSA-2009-0315.html
securityfocus.com / bid/33990
vupen.com / english/advisories/2009/0632
Vendor Advisory