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Fencer Vulns
medium 5.8

CVE-2009-0652 json

The Internationalized Domain Names (IDN) blacklist in Mozilla Firefox 3.0.6 and other versions before 3.0.9; Thunderbird before 2.0.0.21; a…

published 2009-02-20 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-0655

cvss
5.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits
0
none known

Summary

The Internationalized Domain Names (IDN) blacklist in Mozilla Firefox 3.0.6 and other versions before 3.0.9; Thunderbird before 2.0.0.21; and SeaMonkey before 1.1.15 does not include box-drawing characters, which allows remote attackers to spoof URLs and conduct phishing attacks, as demonstrated by homoglyphs of the / (slash) and ? (question mark) characters in a subdomain of a .cn domain name, a different vulnerability than CVE-2005-0233. NOTE: some third parties claim that 3.0.6 is not affected, but much older versions perhaps are affected.

Patch / fix

  • seamonkey RHEL 2.1 1.0.9-0.33.el2
  • seamonkey RHEL 3 1.0.9-0.37.el3
  • seamonkey RHEL 4 1.0.9-41.el4
  • seamonkey-nss RHEL 2.1 1.0.9-0.33.el2
  • seamonkey-nss RHEL 3 1.0.9-0.37.el3
  • seamonkey-chat RHEL 2.1 1.0.9-0.33.el2
  • seamonkey-chat RHEL 3 1.0.9-0.37.el3
  • seamonkey-chat RHEL 4 1.0.9-41.el4

red hat advisories RHSA-2009:0437RHSA-2009:0436

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10071-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-0652 updated cvss 4.3

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

  • Red Hat Desktop version 3 seamonkey 1.0.9-0.37.el3, seamonkey-nss 1.0.9-0.37.el3, seamonkey-chat 1.0.9-0.37.el3, seamonkey-mail 1.0.9-0.37.el3, seamonkey-nspr 1.0.9-0.37.el3, seamonkey-js-debugger 1.0.9-0.37.el3, +1 more
    fixed: vendor fix RHSA-2009:0437
  • Red Hat Enterprise Linux (v. 5 server) firefox 3.0.9-1.el5, xulrunner 1.9.0.9-1.el5, xulrunner-devel-unstable 1.9.0.9-1.el5
    fixed: vendor fix RHSA-2009:0436
  • Red Hat Enterprise Linux AS (Advanced Server) version 2.1 seamonkey 1.0.9-0.33.el2, seamonkey-nss 1.0.9-0.33.el2, seamonkey-chat 1.0.9-0.33.el2, seamonkey-mail 1.0.9-0.33.el2, seamonkey-nspr 1.0.9-0.33.el2, seamonkey-js-debugger 1.0.9-0.33.el2, +1 more Red Hat Enterprise Linux AS version 3 seamonkey 1.0.9-0.37.el3, seamonkey-nss 1.0.9-0.37.el3, seamonkey-chat 1.0.9-0.37.el3, seamonkey-mail 1.0.9-0.37.el3, seamonkey-nspr 1.0.9-0.37.el3, seamonkey-js-debugger 1.0.9-0.37.el3, +1 more Red Hat Enterprise Linux AS version 4 firefox 3.0.9-1.el4, seamonkey 1.0.9-41.el4, seamonkey-chat 1.0.9-41.el4, seamonkey-mail 1.0.9-41.el4, seamonkey-js-debugger 1.0.9-41.el4, seamonkey-dom-inspector 1.0.9-41.el4
    fixed: vendor fix RHSA-2009:0437
  • Red Hat Enterprise Linux Desktop (v. 5 client) firefox 3.0.9-1.el5, xulrunner 1.9.0.9-1.el5, xulrunner-devel-unstable 1.9.0.9-1.el5
    fixed: vendor fix RHSA-2009:0436
  • Red Hat Enterprise Linux Desktop version 4 firefox 3.0.9-1.el4, seamonkey 1.0.9-41.el4, seamonkey-chat 1.0.9-41.el4, seamonkey-mail 1.0.9-41.el4, seamonkey-js-debugger 1.0.9-41.el4, seamonkey-dom-inspector 1.0.9-41.el4
    fixed: vendor fix RHSA-2009:0437
  • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) xulrunner 1.9.0.9-1.el5, xulrunner-devel-unstable 1.9.0.9-1.el5
    fixed: vendor fix RHSA-2009:0436
  • Red Hat Enterprise Linux ES version 2.1 seamonkey 1.0.9-0.33.el2, seamonkey-nss 1.0.9-0.33.el2, seamonkey-chat 1.0.9-0.33.el2, seamonkey-mail 1.0.9-0.33.el2, seamonkey-nspr 1.0.9-0.33.el2, seamonkey-js-debugger 1.0.9-0.33.el2, +1 more Red Hat Enterprise Linux ES version 3 seamonkey 1.0.9-0.37.el3, seamonkey-nss 1.0.9-0.37.el3, seamonkey-chat 1.0.9-0.37.el3, seamonkey-mail 1.0.9-0.37.el3, seamonkey-nspr 1.0.9-0.37.el3, seamonkey-js-debugger 1.0.9-0.37.el3, +1 more Red Hat Enterprise Linux ES version 4 firefox 3.0.9-1.el4, seamonkey 1.0.9-41.el4, seamonkey-chat 1.0.9-41.el4, seamonkey-mail 1.0.9-41.el4, seamonkey-js-debugger 1.0.9-41.el4, seamonkey-dom-inspector 1.0.9-41.el4 Red Hat Enterprise Linux WS version 2.1 seamonkey 1.0.9-0.33.el2, seamonkey-nss 1.0.9-0.33.el2, seamonkey-chat 1.0.9-0.33.el2, seamonkey-mail 1.0.9-0.33.el2, seamonkey-nspr 1.0.9-0.33.el2, seamonkey-js-debugger 1.0.9-0.33.el2, +1 more Red Hat Enterprise Linux WS version 3 seamonkey 1.0.9-0.37.el3, seamonkey-nss 1.0.9-0.37.el3, seamonkey-chat 1.0.9-0.37.el3, seamonkey-mail 1.0.9-0.37.el3, seamonkey-nspr 1.0.9-0.37.el3, seamonkey-js-debugger 1.0.9-0.37.el3, +1 more Red Hat Enterprise Linux WS version 4 firefox 3.0.9-1.el4, seamonkey 1.0.9-41.el4, seamonkey-chat 1.0.9-41.el4, seamonkey-mail 1.0.9-41.el4, seamonkey-js-debugger 1.0.9-41.el4, seamonkey-dom-inspector 1.0.9-41.el4
    +1 more products
    Red Hat Linux Advanced Workstation 2.1 seamonkey 1.0.9-0.33.el2, seamonkey-nss 1.0.9-0.33.el2, seamonkey-chat 1.0.9-0.33.el2, seamonkey-mail 1.0.9-0.33.el2, seamonkey-nspr 1.0.9-0.33.el2, seamonkey-js-debugger 1.0.9-0.33.el2, +1 more
    fixed: vendor fix RHSA-2009:0437

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.50% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:N/I:P/A:P

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.