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Not in CISA KEV
MEDIUM severity

TunnelVision - decloaking VPNs using DHCPGHSA-hqmp-g7ph-x543

MEDIUM

GHSA-hqmp-g7ph-x543 is a medium-severity (CVSS 5.3) vulnerability in quincy. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Published
Updated
Affected
1 pkg
Patched
None yet
Exploits
None indexed
Exploitation data as of May 19, 2025 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
🦀quincy

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

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

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🦀crates.ioquincyall versionsNo fix

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for quincy, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    The records we use list no patched version of quincy for GHSA-hqmp-g7ph-x543. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

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, the
O3 Security · Impact-Aware SCA

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TunnelVision - decloaking VPNs using DHCP (Medium 5.3)