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Fencer Intel
medium 4.3

CVE-2010-1210 json

intl/uconv/util/nsUnicodeDecodeHelper.cpp in Mozilla Firefox before 3.6.7 and Thunderbird before 3.1.1 inserts a U+FFFD sequence into text…

published 16y ago modified 4mo ago also EUVD-2010-1240

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

intl/uconv/util/nsUnicodeDecodeHelper.cpp in Mozilla Firefox before 3.6.7 and Thunderbird before 3.1.1 inserts a U+FFFD sequence into text in certain circumstances involving undefined positions, which might make it easier for remote attackers to conduct cross-site scripting (XSS) attacks via crafted 8-bit text.

Patch / fix

  • firefox RHEL 4 3.6.7-2.el4
  • firefox RHEL 5 3.6.7-2.el5
  • xulrunner RHEL 5 1.9.2.7-2.el5

red hat advisories RHSA-2010:0547

  • 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

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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-2010-1210 updated cvss 5.1

Mozilla Characters mapped to U+FFFD in 8 bit encodings cause subsequent character to vanish

  • Red Hat Enterprise Linux 6 firefox
    affected: no fix available
  • Red Hat Enterprise Linux (v. 5 server) firefox 3.6.7-2.el5, xulrunner 1.9.2.7-2.el5 Red Hat Enterprise Linux AS version 4 firefox 3.6.7-2.el4 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 3.6.7-2.el5, xulrunner 1.9.2.7-2.el5 Red Hat Enterprise Linux Desktop version 4 firefox 3.6.7-2.el4 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) xulrunner 1.9.2.7-2.el5 Red Hat Enterprise Linux ES version 4 firefox 3.6.7-2.el4
    +1 more products
    Red Hat Enterprise Linux WS version 4 firefox 3.6.7-2.el4
    fixed: vendor fix RHSA-2010:0547

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

1.56% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel 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.