Firefox: overlong UTF-8 seqence detection problem
Published Nov 12, 2010
4.3
MEDIUMCVSS 2.0
EPSS 1.83%
Description
Mozilla Firefox before 3.6 Beta 3 does not properly handle overlong UTF-8 encoding, which makes it easier for remote attackers to bypass cross-site scripting (XSS) protection mechanisms via a crafted string, a different vulnerability than CVE-2010-1210.
Affected products
No data.
No data.
Red Hat Enterprise Linux 4
firefox-0:3.6.4-8.el4
Fixed · RHSA-2010:0500
Red Hat Enterprise Linux 5
devhelp-0:0.12-21.el5
Fixed · RHSA-2010:0501
Red Hat Enterprise Linux 5
esc-0:1.1.0-12.el5
Fixed · RHSA-2010:0501
Red Hat Enterprise Linux 5
firefox-0:3.6.4-8.el5
Fixed · RHSA-2010:0501
Red Hat Enterprise Linux 5
gnome-python2-extras-0:2.14.2-7.el5
Fixed · RHSA-2010:0501
Red Hat Enterprise Linux 5
totem-0:2.16.7-7.el5
Fixed · RHSA-2010:0501
Red Hat Enterprise Linux 5
xulrunner-0:1.9.2.4-10.el5
Fixed · RHSA-2010:0501
Red Hat Enterprise Linux 5
yelp-0:2.16.0-26.el5
Fixed · RHSA-2010:0501
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | firefox-0:3.6.4-8.el4 | Fixed | RHSA-2010:0500 |
| Red Hat Enterprise Linux 5 | devhelp-0:0.12-21.el5 | Fixed | RHSA-2010:0501 |
| Red Hat Enterprise Linux 5 | esc-0:1.1.0-12.el5 | Fixed | RHSA-2010:0501 |
| Red Hat Enterprise Linux 5 | firefox-0:3.6.4-8.el5 | Fixed | RHSA-2010:0501 |
| Red Hat Enterprise Linux 5 | gnome-python2-extras-0:2.14.2-7.el5 | Fixed | RHSA-2010:0501 |
| Red Hat Enterprise Linux 5 | totem-0:2.16.7-7.el5 | Fixed | RHSA-2010:0501 |
| Red Hat Enterprise Linux 5 | xulrunner-0:1.9.2.4-10.el5 | Fixed | RHSA-2010:0501 |
| Red Hat Enterprise Linux 5 | yelp-0:2.16.0-26.el5 | Fixed | RHSA-2010:0501 |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.83% (0.01831) | 78.09th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.87% (0.01867) | 76.49th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.18% (0.00179) | 37.21th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.18% (0.00176) | 56.06th | v3 (v2023.03.01) |
| Apr 25, 2024 | 0.15% (0.00154) | 51.05th | v3 (v2023.03.01) |
| Mar 15, 2024 | 0.14% (0.00136) | 47.99th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.12% (0.00123) | 45.48th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.18% (0.00176) | 52.96th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 17, 2023 | 1.21% (0.01213) | 66.22th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
References (8)
- http://hg.mozilla.org/releases/mozilla-1.9.2/rev/e42c563313a0 x_refsource_CONFIRM
- http://sirdarckcat.blogspot.com/2009/10/couple-of-unicode-issues-on-php-and.html x_refsource_MISCExploit
- https://access.redhat.com/security/cve/CVE-2009-5017 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=511859 x_refsource_CONFIRMPatch
- https://bugzilla.mozilla.org/show_bug.cgi?id=522634 x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=656287 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2009-5017
- https://www.cve.org/CVERecord?id=CVE-2009-5017
| Link | Providers | Tags |
|---|---|---|
| http://hg.mozilla.org/releases/mozilla-1.9.2/rev/e42c563313a0 | x_refsource_CONFIRM | |
| http://sirdarckcat.blogspot.com/2009/10/couple-of-unicode-issues-on-php-and.html | x_refsource_MISCExploit | |
| https://access.redhat.com/security/cve/CVE-2009-5017 | Vendor Advisory | |
| https://bugzilla.mozilla.org/show_bug.cgi?id=511859 | x_refsource_CONFIRMPatch | |
| https://bugzilla.mozilla.org/show_bug.cgi?id=522634 | x_refsource_CONFIRM | |
| https://bugzilla.redhat.com/show_bug.cgi?id=656287 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2009-5017 | ||
| https://www.cve.org/CVERecord?id=CVE-2009-5017 |
Change history (0)
No recorded changes yet.