CVE-2023-35838Public exploit

Traffic blocking via manipulated local-network routes

Published Aug 9, 2023 · Updated Oct 18, 2024

Routing misconfiguration in WireGuard client 0.5.3 on Windows allows physically proximate attackers to block selected IP traffic. The client treats an attacker-assigned public subnet as local and applies routing and firewall rules that prevent traffic to matching destinations despite the active VPN tunnel. Exploitation requires the victim to connect to an attacker-controlled Wi-Fi or Ethernet network that supplies the non-RFC1918 subnet.

CVSS severity5.7
Medium
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Routing misconfiguration in WireGuard client 0.5.3 on Windows allows physically proximate attackers to block selected IP traffic. The client treats an attacker-assigned public subnet as local and applies routing and firewall rules that prevent traffic to matching destinations despite the active VPN tunnel. Exploitation requires the victim to connect to an attacker-controlled Wi-Fi or Ethernet network that supplies the non-RFC1918 subnet.

The record

CVE
CVE-2023-35838
Published
Aug 9, 2023
Updated
Oct 18, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-610, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 18, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.7NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-610Externally Controlled Reference to a Resource in Another Sphere
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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