Vulnerability in Microsoft Windows
CVE-2023-35838
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (50.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.000
Affected products
- Microsoft Windows
- Wireguard — versions 0.5.3
Weakness classification (CWE)
References
- wireguard.com (Product)
- tunnelcrack.mathyvanhoef.com/details.html (Exploit, Third Party Advisory)
- psirt.global.sonicwall.com/vuln-detail/SNWLID-2023-0015
Frequently asked questions
- What is CVE-2023-35838?
- CVE-2023-35838 is a medium-severity vulnerability in Microsoft Windows, classified under Externally Controlled Reference to a Resource in Another Sphere. CVSS score: 5.7/10. Published 2023-08-09.
- How severe is CVE-2023-35838?
- Medium severity. CVSS v3 base score is 5.7 out of 10.