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Medium, CVSS 5.3

TunnelVision - decloaking VPNs using DHCP

GHSA-hqmp-g7ph-x543

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • crates.io quincy

    Affected
    <= 0.13.0
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.3 · CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

A new decloaking technique for nearly all VPN implementations has been found, which allows attackers to inject entries into the routing tables of unsuspecting victims using DHCP option 121. This allows attackers to redirect traffic, which is supposed to be sent encrypted over the VPN, through the physical interface handling DHCP for the network the victim's computer is connected to, effectively bypassing the VPN connection. Impact All users are potentially affected, as this attack vector can be used against any VPN implementation without mitigations in place. Patches Currently, there are no existing mitigations employed by Quincy. Workarounds Disabling DHCP option 121 in the DHCP client is a potential workaround, as it prevents this kind of attack. References https://www.leviathansecurity.com/blog/tunnelvision

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-hqmp-g7ph-x543

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: GHSA-hqmp-g7ph-x543

Advisory: TunnelVision - decloaking VPNs using DHCP
IDs: GHSA-hqmp-g7ph-x543
Record: https://patchnext.com/advisories/ghsa-hqmp-g7ph-x543 (revision 1, source checked 26 Oct 2026, 15:38 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io quincy: affected <= 0.13.0

## Suggested inspection (read-only)
- crates.io quincy: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on quincy.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-hqmp-g7ph-x543 (GitHub-reviewed advisory GHSA-hqmp-g7ph-x543 lists affected ranges: crates.io quincy >=0 <=0.13.0)

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