VDB-218272 · CVE-2022-48256 · GCVE-0-2022-48256

Technitium DNS Server up to 9.x CNAME denial of service

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.
5.4	$0-$5k	0.00

Summaryinfo

A vulnerability described as problematic has been identified in Technitium DNS Server up to 9.x. Affected is an unknown function of the component CNAME Handler. Executing a manipulation can lead to denial of service. This vulnerability is tracked as CVE-2022-48256. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Technitium DNS Server up to 9.x and classified as problematic. This vulnerability affects an unknown code block of the component CNAME Handler. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

Technitium DNS Server before 10.0 allows a self-CNAME denial-of-service attack in which a CNAME loop causes an answer to contain hundreds of records.

The weakness was disclosed 01/13/2023. The advisory is shared for download at github.com. This vulnerability was named CVE-2022-48256 since 01/13/2023. There are neither technical details nor an exploit publicly available.

Upgrading to version 10.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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

Productinfo

Vendor

Technitium

Name

DNS Server

Version

CPE 2.3info

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CPE 2.2info

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CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: DNS Server 10.0

Timelineinfo

01/13/2023 🔍
01/13/2023 +0 days 🔍
01/13/2023 +0 days 🔍
04/07/2025 +815 days 🔍

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2022-48256 (🔍)
GCVE (CVE): GCVE-0-2022-48256
GCVE (VulDB): GCVE-100-218272

Entryinfo

Created: 01/13/2023 10:18
Updated: 04/07/2025 20:54
Changes: 01/13/2023 10:18 (41), 02/05/2023 17:53 (11), 04/07/2025 20:54 (16)
Complete: 🔍
Cache ID: 216::103