CVE-2023-35838 — MEDIUM (5.7)

Vulnerability Description

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.

CVSS Score

5.7

MEDIUM

CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector

ADJACENT_NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Wireguard	Wireguard	0.5.3
Microsoft	Windows	-

Related Weaknesses (CWE)

CWE-610

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2023-0015
https://tunnelcrack.mathyvanhoef.com/details.htmlExploitThird Party Advisory
https://wireguard.comProduct
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2023-0015
https://tunnelcrack.mathyvanhoef.com/details.htmlExploitThird Party Advisory
https://wireguard.comProduct

FAQ

What is CVE-2023-35838?

CVE-2023-35838 is a vulnerability with a CVSS score of 5.7 (MEDIUM). 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 adversa...

How severe is CVE-2023-35838?

CVE-2023-35838 has been rated MEDIUM with a CVSS base score of 5.7/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2023-35838?

Check the references section above for vendor advisories and patch information. Affected products include: Wireguard Wireguard, Microsoft Windows.