VDB-236679 · CVE-2023-35838 · EUVD-2023-39833

WireGuard Client 0.5.3 on Windows 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.
4.5	$0-$5k	0.00

Summaryinfo

A vulnerability identified as problematic has been detected in WireGuard Client 0.5.3 on Windows. This vulnerability affects unknown code. Performing a manipulation results in denial of service. This vulnerability is cataloged as CVE-2023-35838. The attack must be initiated from a local position. There is no exploit available.

Detailsinfo

A vulnerability was found in WireGuard Client 0.5.3 on Windows. It has been classified as problematic. This affects some unknown functionality. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. The summary by CVE is:

The WireGuard client 0.5.3 on Windows insecurely configures the operating system and firewall such that traffic to a local network that uses non-RFC1918 IP addresses is blocked. This allows an adversary to trick the victim into blocking IP traffic to selected IP addresses and services even while the VPN is enabled. NOTE: the tunnelcrack.mathyvanhoef.com website uses this CVE ID to refer more generally to "LocalNet attack resulting in the blocking of traffic" rather than to only WireGuard.

The weakness was shared 08/10/2023. It is possible to read the advisory at tunnelcrack.mathyvanhoef.com. This vulnerability is uniquely identified as CVE-2023-35838 since 06/18/2023. The technical details are unknown and an exploit is not publicly available.

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 vulnerability database at EUVD (EUVD-2023-39833). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

WireGuard

Name

Client

Version

0.5.3

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.5

VulDB Base Score: 3.3
VulDB Temp Score: 3.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.7
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: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/18/2023 🔍
08/10/2023 +53 days 🔍
08/10/2023 +0 days 🔍
01/11/2026 +885 days 🔍

Sourcesinfo

Advisory: tunnelcrack.mathyvanhoef.com
Status: Not defined

CVE: CVE-2023-35838 (🔍)
GCVE (CVE): GCVE-0-2023-35838
GCVE (VulDB): GCVE-100-236679
EUVD: 🔍

Entryinfo

Created: 08/10/2023 08:30
Updated: 01/11/2026 11:11
Changes: 08/10/2023 08:30 (38), 09/02/2023 17:29 (11), 01/11/2026 11:11 (16)
Complete: 🔍
Cache ID: 216::103