Published:2011/07/28  Last Updated:2011/09/05

Mozilla Firefox vulnerability in processing content-length header


Mozilla Firefox contains a vulnerability in the processing of content-length header.

Products Affected

  • Mozilla Firefox and earlier


Mozilla Firefox contains a vulnerability in the processing of content-length header.


When a malicious website is viewed, a script may be injected within a response from another domain.


Update the software
Update to the latest version according to the information provided by the developer.

This issue has been resolved in Mozilla Firefox

Vendor Status

Vendor Status Last Update Vendor Notes
Mozilla Japan vulnerable 2011/07/28


JPCERT/CC Addendum

This JVN publication was delayed to 2011/07/28 after developer fixes were developed. From the fiscal year 2011, JPCERT/CC is using a new vendor coordination procedure. This new procedure came from the recommendation of the fiscal year 2010 "Study Group on Information System Vulnerability Handling" aimed at more timely JVN publications.

Vulnerability Analysis by JPCERT/CC

Analyzed on 2011.07.28

Measures Conditions Severity
Access Required can be attacked over the Internet using packets
  • High
Authentication anonymous or no authentication (IP addresses do not count)
  • High
User Interaction Required the user must be convinced to take a standard action that does not feel harmful to most users, such as click on a link or view a file
  • Mid
Exploit Complexity some expertise and/or luck required (most buffer overflows, guessing correctly in small space, expertise in Windows function calls)
  • Mid-High

Description of each analysis measures


Kazuho Oku of Cybozu Laboratories, Inc. reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
CVE CVE-2011-2668
JVN iPedia JVNDB-2011-000055

Update History

CVE was added under the section "Other Information."