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CVE-2023-35838

MEDIUMCVSS 5.7/10EPSS 0.81%

Last modified

CVE-2023-35838 is a medium-severity vulnerability rated 5.7/10 on the CVSS scale. 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. EPSS estimates a 0.81% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
5.7/10

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

EPSS Probability
0.81%

52.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
WireguardWireguard0.5.3

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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.
How severe is CVE-2023-35838?
CVE-2023-35838 has a CVSS score of 5.7/10 (MEDIUM severity). The EPSS model estimates a 0.81% probability of exploitation in the next 30 days.
How do I fix CVE-2023-35838?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-35838?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST