Vulnerability identifier: #VU82576

Vulnerability risk: Medium

CVSSv3.1: 4 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:U/RC:C]

CVE-ID: CVE-2023-35838

CWE-ID: CWE-610

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
WireGuard for Windows
Client/Desktop applications / Other client software

Vendor: WireGuard

Description

The vulnerability allows a remote attacker to block access to certain resources.

The vulnerability exists due to the way WireGuard handles non-RFC1918 IP addresses. A remote attacker can trick the victim into blocking IP traffic to selected IP addresses and services even while the VPN is enabled.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

WireGuard for Windows: 0.0.1 - 0.5.3

---

External links
http://tunnelcrack.mathyvanhoef.com/details.html
http://wireguard.com

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.