What’s Vulnerable › Vulnerabilities

CVE-2016-7943

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2016-12-13 · updated 2026-06-17
• Weakness: CWE-787

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

• Fedoraproject Fedora: 25
• x.org libX11: through 1.6.3

References

• http://www.openwall.com/lists/oss-security/2016/10/04/2
• http://www.openwall.com/lists/oss-security/2016/10/04/4
• http://www.securityfocus.com/bid/93362
• http://www.securitytracker.com/id/1036945
• https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=8c29f1607a31dac0911e45a0dd3d74173822b3c9
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GMCVDXMFPXR7QGMKDG22WPPJCXH2X3L7/
• https://lists.x.org/archives/xorg-announce/2016-October/002720.html
• https://security.gentoo.org/glsa/201704-03
• https://usn.ubuntu.com/3758-1/
• https://usn.ubuntu.com/3758-2/
• http://www.openwall.com/lists/oss-security/2016/10/04/2
• http://www.openwall.com/lists/oss-security/2016/10/04/4

Get alerted when CVE-2016-7943 or the next vulnerability affects your stack