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CVE-2009-0652

16
FAUCET Score

CVE-2009-0652 describes a URL spoofing vulnerability in Mozilla Firefox, Thunderbird, and SeaMonkey due to an incomplete Internationalized Domain Names (IDN) blacklist. Attackers could leverage box-drawing characters as homoglyphs for common URL delimiters like '/' and '?' to conduct phishing attacks. This medium-severity vulnerability (CVSS 5.8) has a network attack vector and medium attack complexity, potentially leading to information disclosure and partial integrity impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this older vulnerability.

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
71.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0150 is in the 45th percentile among its peer group of 19,956 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 (6)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 2.1Fixed in: seamonkey-0:1.0.9-0.33.el2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 3Fixed in: seamonkey-0:1.0.9-0.37.el3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: firefox-0:3.0.9-1.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: seamonkey-0:1.0.9-41.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: firefox-0:3.0.9-1.el5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xulrunner-0:1.9.0.9-1.el5
View patch

Vendor Advisories (1)

redhatCVE-2009-0652Moderate

firefox: does not properly prevent the literal rendering of homoglyph characters in IDN domain names (spoof URLs and conduct phishing attacks)

Feb 16, 2009

References

lists.immunitysec.com / pipermail/dailydave/2009-February/005556.html
lists.immunitysec.com / pipermail/dailydave/2009-February/005563.html
lists.opensuse.org / opensuse-security-announce/2009-05/msg00000.html
rhn.redhat.com / errata/RHSA-2009-0437.html
secunia.com / advisories/34096
Vendor Advisory
secunia.com / advisories/34843
Vendor Advisory
secunia.com / advisories/34844
Vendor Advisory
secunia.com / advisories/34894
Vendor Advisory
secunia.com / advisories/35042
Vendor Advisory
secunia.com / advisories/35065
Vendor Advisory
exchange.xforce.ibmcloud.com / vulnerabilities/48974
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11396
usn.ubuntu.com / 764-1
blackhat.com / presentations/bh-dc-09/Marlinspike/BlackHat-DC-09-Marlinspike-Defeating-SSL.pdf
redhat.com / archives/fedora-package-announce/2009-April/msg00683.html
blackhat.com / html/bh-dc-09/bh-dc-09-speakers.html
debian.org / security/2009/dsa-1797
debian.org / security/2009/dsa-1830
mandriva.com / security/advisories
mozilla.org / security/announce/2009/mfsa2009-15.html
redhat.com / support/errata/RHSA-2009-0436.html
securityfocus.com / bid/33837
vupen.com / english/advisories/2009/1125
Vendor Advisory