VDB-224656 · CVE-2023-1393 · EUVD-2023-23649

X.Org Server Overlay Window use after free

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.5	$0-$5k	0.00

Summaryinfo

A vulnerability described as problematic has been identified in X.Org Server. This vulnerability affects unknown code of the component Overlay Window. Executing a manipulation can lead to use after free. This vulnerability is handled as CVE-2023-1393. It is possible to launch the attack on the local host. There is not any exploit available.

Detailsinfo

A vulnerability was found in X.Org Server (unknown version). It has been declared as problematic. This vulnerability affects an unknown code block of the component Overlay Window. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was released 03/31/2023 as FEDORA-2023-eb3c27ff25. The advisory is shared for download at lists.fedoraproject.org. This vulnerability was named CVE-2023-1393 since 03/14/2023. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 211567 (Oracle Linux 9 : xorg-x11-server-Xwayland (ELSA-2024-9093)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (211567) and EUVD (EUVD-2023-23649). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

X.Org

Name

Server

License

open-source

Website

Vendor: https://www.x.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.5

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 211567
Nessus Name: Oracle Linux 9 : xorg-x11-server-Xwayland (ELSA-2024-9093)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

03/14/2023 🔍
03/31/2023 +16 days 🔍
03/31/2023 +0 days 🔍
08/11/2025 +864 days 🔍

Sourcesinfo

Vendor: x.org

Advisory: FEDORA-2023-eb3c27ff25
Status: Confirmed

CVE: CVE-2023-1393 (🔍)
GCVE (CVE): GCVE-0-2023-1393
GCVE (VulDB): GCVE-100-224656
EUVD: 🔍

Entryinfo

Created: 03/31/2023 09:15
Updated: 08/11/2025 07:30
Changes: 03/31/2023 09:15 (37), 04/20/2023 20:42 (11), 11/19/2024 23:13 (17), 08/11/2025 07:30 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.