libX11: Insufficient validation of server responses in FontNames
Published Dec 13, 2016
9.8
CRITICALCVSS 3.0
EPSS 4.29%
Description
The XListFonts function in X.org libX11 before 1.6.4 might allow remote X servers to gain privileges via vectors involving length fields, which trigger out-of-bounds write operations.
Affected products
No data.
Configuration 1
- 25
No data.
Red Hat Enterprise Linux 5
libX11
Will not fix
Red Hat Enterprise Linux 6
libX11
Will not fix
Red Hat Enterprise Linux 7
libX11
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | libX11 | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | libX11 | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | libX11 | Will not fix | n/a |
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.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
AV:N/AC:L/Au:N/C:P/I:P/A:P
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 (16 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 4.29% (0.04286) | 90.80th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.50% (0.04496) | 90.24th | v5 (v2026.06.15) |
| Jul 13, 2025 | 4.71% (0.04712) | 88.90th | v4 (v2025.03.14) |
| Mar 30, 2025 | 3.16% (0.03155) | 85.75th | v4 (v2025.03.14) |
| Mar 29, 2025 | 15.39% (0.15387) | 91.10th | v4 (v2025.03.14) |
| Mar 17, 2025 | 3.16% (0.03155) | 86.04th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.97% (0.01967) | 89.22th | v3 (v2023.03.01) |
| May 25, 2024 | 1.97% (0.01967) | 88.71th | v3 (v2023.03.01) |
| Feb 5, 2024 | 1.40% (0.01396) | 85.04th | v3 (v2023.03.01) |
| Nov 8, 2023 | 0.99% (0.00988) | 81.76th | v3 (v2023.03.01) |
| Mar 19, 2023 | 1.10% (0.01104) | 82.24th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.09% (0.01089) | 82.10th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.54% (0.01537) | 74.52th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.54% (0.01537) | 74.48th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.54% (0.01537) | 72.41th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.54% (0.01537) | 51.33th | v2 (v2022.01.01) |
References (14)
- http://www.openwall.com/lists/oss-security/2016/10/04/2 mailing-listx_refsource_MLIST
- http://www.openwall.com/lists/oss-security/2016/10/04/4 mailing-listx_refsource_MLIST
- http://www.securityfocus.com/bid/93362 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1036945 vdb-entryx_refsource_SECTRACK
- https://access.redhat.com/security/cve/CVE-2016-7943 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1381861 Issue Tracking
- https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=8c29f1607a31dac0911e45a0dd3d74173822b3c9 x_refsource_CONFIRM
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GMCVDXMFPXR7QGMKDG22WPPJCXH2X3L7/ vendor-advisoryx_refsource_FEDORA
- https://lists.x.org/archives/xorg-announce/2016-October/002720.html mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2016-7943
- https://security.gentoo.org/glsa/201704-03 vendor-advisoryx_refsource_GENTOO
- https://usn.ubuntu.com/3758-1/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/3758-2/ vendor-advisoryx_refsource_UBUNTU
- https://www.cve.org/CVERecord?id=CVE-2016-7943
Change history (0)
No recorded changes yet.