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TI-2009-04773 Aliases CVE-2009-5017GHSA-p83q-cg3p-77f9

Mozilla Firefox before 3.6 Beta 3 does not properly handle overlong UTF-8 encoding, which…

Priority LOW 24CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
— Not recorded in CVSS 2.0
Attack complexity
Medium
Impact type
Cross-site scripting
Confidentiality · integrity · availability
None · Partial · None
Fix status
Fixed

Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-79.

Summary

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.

Why it matters now

EPSS 0.01831 79th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Red Hat: 2 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:beta2:*:*:*:*:*:*up to 3.6VulnerableMozilla
cpe:2.3:a:mozilla:firefox:3.6:beta1:*:*:*:*:*:*3.6 beta1VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:beta2:*:*:*:*:*:* Versions up to 3.6 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox:3.6:beta1:*:*:*:*:*:* Versions 3.6 beta1 Vulnerable ·Mozilla

Remediation

Red Hat 2 advisories

  • RHSA-2010:0501 Released 2010-06-22 · Red Hat rating Critical
    firefox security, bug fix, and enhancement update
    • Red Hat Enterprise Linux (v. 5 server) devhelp-0.12-21.el5, devhelp-0.12-21.el5.i386, devhelp-0.12-21.el5.ia64 +47
    • Red Hat Enterprise Linux Desktop (v. 5 client) devhelp-0.12-21.el5, devhelp-0.12-21.el5.i386, esc-1.1.0-12.el5 +22
    • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) devhelp-0.12-21.el5, devhelp-devel-0.12-21.el5, devhelp-devel-0.12-21.el5.i386 +6
  • RHSA-2010:0500 Released 2010-06-22 · Red Hat rating Critical
    firefox security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AS version 4 firefox-3.6.4-8.el4, firefox-3.6.4-8.el4.i386, firefox-3.6.4-8.el4.ia64 +1
    • Red Hat Enterprise Linux Desktop version 4 firefox-3.6.4-8.el4, firefox-3.6.4-8.el4.i386
    • Red Hat Enterprise Linux ES version 4 firefox-3.6.4-8.el4, firefox-3.6.4-8.el4.i386, firefox-3.6.4-8.el4.ia64
    • Red Hat Enterprise Linux WS version 4 firefox-3.6.4-8.el4, firefox-3.6.4-8.el4.i386, firefox-3.6.4-8.el4.ia64

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux (v. 5 server)Fixed RHSA-2010:0501
Red Hat Enterprise Linux AS version 4Fixed RHSA-2010:0500
Red Hat Enterprise Linux Desktop (v. 5 client)Fixed RHSA-2010:0501
Red Hat Enterprise Linux Desktop Workstation (v. 5 client)Fixed RHSA-2010:0501
Red Hat Enterprise Linux Desktop version 4Fixed RHSA-2010:0500
Red Hat Enterprise Linux ES version 4Fixed RHSA-2010:0500
Red Hat Enterprise Linux WS version 4Fixed RHSA-2010:0500

Timeline

  1. 2026-10-02 Threatist record created from CVE-2009-5017
  2. 2026-10-03 Alias added: GHSA-p83q-cg3p-77f9

References

Exploit 1

Patch 1

Other 2

  • TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
  • TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences