VDB-164321 · CVE-2020-28049 · Nessus 250078

SDDM up to 0.18.x X Server race condition

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.
6.2	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in SDDM up to 0.18.x and classified as critical. This vulnerability affects unknown code of the component X Server. The manipulation leads to race condition. This vulnerability is documented as CVE-2020-28049. The attack can be initiated remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in SDDM up to 0.18.x. It has been rated as critical. This issue affects an unknown part of the component X Server. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. Impacted is confidentiality, integrity, and availability.

The weakness was released 11/05/2020. The advisory is shared at bugzilla.suse.com. The identification of this vulnerability is CVE-2020-28049. The exploitation is known to be easy. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 250078 (Linux Distros Unpatched Vulnerability : CVE-2020-28049), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.19.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (250078). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

SDDM

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.3
NVD Vector: 🔍

CNA Base Score: 6.3
CNA Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

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: 250078
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2020-28049

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: SDDM 0.19.0

Timelineinfo

11/02/2020 🔍
11/05/2020 +3 days 🔍
11/05/2020 +0 days 🔍
08/17/2025 +1746 days 🔍

Sourcesinfo

Advisory: bugzilla.suse.com
Status: Confirmed

CVE: CVE-2020-28049 (🔍)
GCVE (CVE): GCVE-0-2020-28049
GCVE (VulDB): GCVE-100-164321

Entryinfo

Created: 11/05/2020 07:14
Updated: 08/17/2025 14:29
Changes: 11/05/2020 07:14 (37), 12/02/2020 11:43 (2), 12/02/2020 11:47 (16), 10/16/2024 00:12 (25), 08/17/2025 14:29 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.