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Fencer Intel
medium 4.3

CVE-2011-3000 json

Mozilla Firefox before 3.6.23 and 4.x through 6, Thunderbird before 7.0, and SeaMonkey before 2.4 do not properly handle HTTP responses tha…

published 2011-09-29 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-2968

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.0%
EPSS 2.0% chance of exploitation in 30 days, percentile 81%
public exploits
0
none known

Summary

Mozilla Firefox before 3.6.23 and 4.x through 6, Thunderbird before 7.0, and SeaMonkey before 2.4 do not properly handle HTTP responses that contain multiple Location, Content-Length, or Content-Disposition headers, which makes it easier for remote attackers to conduct HTTP response splitting attacks via crafted header values.

Patch / fix

  • thunderbird RHEL 6 3.1.15-1.el6_1
  • firefox RHEL 4 3.6.23-1.el4
  • firefox RHEL 5 3.6.23-2.el5_7
  • firefox RHEL 6 3.6.23-2.el6_1
  • xulrunner RHEL 5 1.9.2.23-1.el5_7
  • xulrunner RHEL 6 1.9.2.23-1.el6_1.1

red hat advisories RHSA-2011:1342RHSA-2011:1341

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 45.5.1-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10071-1openSUSE-SU-2024:10230-1

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-2011-3000 updated cvss 6.8

Mozilla: Defense against multiple Location headers due to CRLF Injection (MFSA 2011-39)

  • Red Hat Enterprise Linux 4 seamonkey, thunderbird Red Hat Enterprise Linux 5 thunderbird
    affected: no fix available
  • Red Hat Enterprise Linux (v. 5 server) firefox 3.6.23-2.el5_7, xulrunner 1.9.2.23-1.el5_7 Red Hat Enterprise Linux AS version 4 firefox 3.6.23-1.el4 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 3.6.23-2.el5_7, xulrunner 1.9.2.23-1.el5_7 Red Hat Enterprise Linux Desktop version 4 firefox 3.6.23-1.el4 Red Hat Enterprise Linux ES version 4 firefox 3.6.23-1.el4 Red Hat Enterprise Linux Server (v. 6) firefox 3.6.23-2.el6_1, xulrunner 1.9.2.23-1.el6_1.1
    +3 more products
    Red Hat Enterprise Linux Server Optional (v. 6) thunderbird 3.1.15-1.el6_1, xulrunner 1.9.2.23-1.el6_1.1 Red Hat Enterprise Linux WS version 4 firefox 3.6.23-1.el4 Red Hat RHEL Desktop Workstation (v. 5 client) xulrunner 1.9.2.23-1.el5_7
    fixed: vendor fix RHSA-2011:1341

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

2.02% chance of exploitation in the next 30 days, higher than 81% 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-94 Improper Control of Generation of Code

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.