⚠ Exploited in the wild
Exploitation observed in the wild. Not yet on CISA KEV.

CVE-2023-1393

CWE-416 — Use After FreeCWE-139313 documents12 sources
Severity
7.8HIGH
EPSS
0.1%
top 76.35%
CISA KEV
Not in KEV
Exploit
Exploited in wild
Active exploitation observed
Affected products
2
X.org X ServerFedoraproject Fedora
Timeline
PublishedMar 30
Latest updateJan 15

Description

A flaw was found in X.Org Server Overlay Window. A Use-After-Free may lead to local privilege escalation. If a client explicitly destroys the compositor overlay window (aka COW), the Xserver would leave a dangling pointer to that window in the CompScreen structure, which will trigger a use-after-free later.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9

Affected Packages4 packages

▶NVDx.org/x_server< 21.1.8
▶Debianxorg-server< 2:1.20.11-1+deb11u6+3
▶CVEListV5xorg-serverxorg-server 21.1.8
▶Debianxwayland< 2:22.1.9-1+2

Also affects: Fedora 36, 37, 38

Patches

Patch: gitlab.freedesktop.org ↗Patch: gitlab.freedesktop.org ↗

🔴Vulnerability Details

4
GHSA
Liferay Portal Uses Default Password↗2025-09-15
▶
GHSA
GHSA-gvfw-3vr2-x46g: A flaw was found in X↗2023-03-30
▶
OSV
CVE-2023-1393: A flaw was found in X↗2023-03-30
▶
CVEList
CVE-2023-1393: A flaw was found in X↗2023-03-30
▶

📋Vendor Advisories

8
Oracle
Oracle Oracle JD Edwards Risk Matrix: E1 Dev Platform Tech - Cloud (X.Org Server) — CVE-2023-1393↗2026-01-15
▶
CISA
Acronis Cyber Infrastructure (ACI) Insecure Default Password Vulnerability↗2024-07-29
▶
Ubuntu
X.Org X Server vulnerability↗2023-03-29
▶
Red Hat
xorg-x11-server: X.Org Server Overlay Window Use-After-Free Local Privilege Escalation Vulnerability↗2023-03-29
▶
BSD
OpenBSD 7.1 Errata 028: SECURITY FIX↗2023-03-29
▶