What’s Vulnerable › Vulnerabilities

CVE-2017-13721

• Severity: medium (CVSS 4.7 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-10-10 · updated 2026-06-17
• Weakness: CWE-269

Description

In X.Org Server (aka xserver and xorg-server) before 1.19.4, an attacker authenticated to an X server with the X shared memory extension enabled can cause aborts of the X server or replace shared memory segments of other X clients in the same session.

Affected products

• Debian Linux: 8.0, 9.0
• xorg-x11-server: through 1.19.3

References

• http://www.debian.org/security/2017/dsa-4000
• http://www.openwall.com/lists/oss-security/2017/10/04/10
• http://www.securityfocus.com/bid/101238
• https://cgit.freedesktop.org/xorg/xserver/commit/?id=b95f25af141d33a65f6f821ea9c003f66a01e1f1
• https://lists.x.org/archives/xorg-announce/2017-October/002808.html
• https://security.gentoo.org/glsa/201710-30
• http://www.debian.org/security/2017/dsa-4000
• http://www.openwall.com/lists/oss-security/2017/10/04/10
• http://www.securityfocus.com/bid/101238
• https://cgit.freedesktop.org/xorg/xserver/commit/?id=b95f25af141d33a65f6f821ea9c003f66a01e1f1
• https://lists.x.org/archives/xorg-announce/2017-October/002808.html
• https://security.gentoo.org/glsa/201710-30

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