Mozilla: Firefox allows for control characters to be set in cookie names (MFSA 2016-04)
Published Jan 31, 2016
5.3
MEDIUMCVSS 3.0
EPSS 1.76%
Description
Mozilla Firefox before 44.0 stores cookies with names containing vertical tab characters, which allows remote attackers to obtain sensitive information by reading HTTP Cookie headers. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-7208.
Affected products
No data.
No data.
Red Hat Enterprise Linux 5
firefox
Not affected
Red Hat Enterprise Linux 5
thunderbird
Not affected
Red Hat Enterprise Linux 6
firefox
Not affected
Red Hat Enterprise Linux 6
thunderbird
Not affected
Red Hat Enterprise Linux 7
firefox
Not affected
Red Hat Enterprise Linux 7
thunderbird
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 5 | thunderbird | Not affected | n/a |
| Red Hat Enterprise Linux 6 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 6 | thunderbird | Not affected | n/a |
| Red Hat Enterprise Linux 7 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 7 | thunderbird | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue does not affect the version of firefox and thunderbird as shipped with Red Hat Enterprise Linux 5, 6 and 7.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
AV:N/AC:L/Au:N/C:P/I:N/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 | 1.76% (0.01765) | 77.24th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.76% (0.01765) | 75.09th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.64% (0.00642) | 68.17th | v4 (v2025.03.14) |
| Mar 29, 2025 | 1.84% (0.01835) | 71.82th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.64% (0.00642) | 68.85th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.50% (0.00499) | 77.09th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.50% (0.00499) | 75.61th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.50% (0.00499) | 72.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.41% (0.01408) | 72.89th | v2 (v2022.01.01) |
| Mar 2, 2023 | 1.41% (0.01408) | 72.88th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.41% (0.01408) | 70.87th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.41% (0.01408) | 49.94th | v2 (v2022.01.01) |
References (13)
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00001.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00002.html vendor-advisoryx_refsource_SUSE
- http://www.mozilla.org/security/announce/2016/mfsa2016-04.html x_refsource_CONFIRMVendor Advisory
- http://www.securitytracker.com/id/1034825 vdb-entryx_refsource_SECTRACK
- http://www.ubuntu.com/usn/USN-2880-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-2880-2 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2016-1939 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1233784 x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=1301822 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2016-1939
- https://security.gentoo.org/glsa/201605-06 vendor-advisoryx_refsource_GENTOO
- https://www.cve.org/CVERecord?id=CVE-2016-1939
- https://www.mozilla.org/security/announce/2016/mfsa2016-04.html
| Link | Providers | Tags |
|---|---|---|
| http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00001.html | vendor-advisoryx_refsource_SUSE | |
| http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00002.html | vendor-advisoryx_refsource_SUSE | |
| http://www.mozilla.org/security/announce/2016/mfsa2016-04.html | x_refsource_CONFIRMVendor Advisory | |
| http://www.securitytracker.com/id/1034825 | vdb-entryx_refsource_SECTRACK | |
| http://www.ubuntu.com/usn/USN-2880-1 | vendor-advisoryx_refsource_UBUNTU | |
| http://www.ubuntu.com/usn/USN-2880-2 | vendor-advisoryx_refsource_UBUNTU | |
| https://access.redhat.com/security/cve/CVE-2016-1939 | Vendor Advisory | |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1233784 | x_refsource_CONFIRM | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1301822 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2016-1939 | ||
| https://security.gentoo.org/glsa/201605-06 | vendor-advisoryx_refsource_GENTOO | |
| https://www.cve.org/CVERecord?id=CVE-2016-1939 | ||
| https://www.mozilla.org/security/announce/2016/mfsa2016-04.html |
Change history (0)
No recorded changes yet.