CVE-2023-36671

Traffic deanonymization via plaintext VPN-server route

Published Aug 9, 2023 · Updated Oct 17, 2024

Cleartext traffic exposure in Clario VPN through 5.9.1.1662 for macOS allows man-in-the-middle attackers to deanonymize users. The client installs a host route that exempts every packet to the VPN server IP, rather than only its own tunnel packets, from VPN protection. Exploitation requires control of the network path and DNS before tunnel setup; exposed plaintext and destination metadata can be read.

CVSS severity6.3
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext traffic exposure in Clario VPN through 5.9.1.1662 for macOS allows man-in-the-middle attackers to deanonymize users. The client installs a host route that exempts every packet to the VPN server IP, rather than only its own tunnel packets, from VPN protection. Exploitation requires control of the network path and DNS before tunnel setup; exposed plaintext and destination metadata can be read.

The record

CVE
CVE-2023-36671
Published
Aug 9, 2023
Updated
Oct 17, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-319, T1040
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 17, 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

6.3NIST NVDCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

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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