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CVE-2024-3661

HIGH
Published 2024-05-06T18:31:21.217Z
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CVSS Score

V3.1
7.6
/10
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.016
probability
of exploitation in the wild

There is a 1.6% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.809
Higher than 80.9% of all CVEs

Attack Vector Metrics

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
HIGH
Integrity
LOW
Availability
LOW

Description

DHCP can add routes to a client’s routing table via the classless static route option (121). VPN-based security solutions that rely on routes to redirect traffic can be forced to leak traffic over the physical interface. An attacker on the same local network can read, disrupt, or possibly modify network traffic that was expected to be protected by the VPN.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

IETF

DHCP

Affected Versions:

0

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed HIGH

GHSA-jcv7-6v4q-4m7x

Advisory Details

By design, the DHCP protocol does not authenticate messages, including for example the classless static route option (121). An attacker with the ability to send DHCP messages can manipulate routes to redirect VPN traffic, allowing the attacker to read, disrupt, or possibly modify network traffic that was expected to be protected by the VPN. Many, if not most VPN systems based on IP routing are susceptible to such attacks.

CVSS Scoring

CVSS Score

7.5

CVSS Vector

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

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2024-3661
WEB https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerability
WEB https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00009
WEB https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp
WEB https://www.leviathansecurity.com/research/tunnelvision
WEB https://www.leviathansecurity.com/blog/tunnelvision
WEB https://www.agwa.name/blog/post/hardening_openvpn_for_def_con
WEB https://tunnelvisionbug.com
WEB https://support.citrix.com/article/CTX677069/cloud-software-group-security-advisory-for-cve20243661
WEB https://security.paloaltonetworks.com/CVE-2024-3661
WEB https://news.ycombinator.com/item?id=40284111
WEB https://news.ycombinator.com/item?id=40279632
WEB https://my.f5.com/manage/s/article/K000139553
WEB https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvision
WEB https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffic
WEB https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims
WEB https://issuetracker.google.com/issues/263721377
WEB https://fortiguard.fortinet.com/psirt/FG-IR-24-170
WEB https://datatracker.ietf.org/doc/html/rfc3442#section-7
WEB https://datatracker.ietf.org/doc/html/rfc2131#section-7
WEB https://bst.cisco.com/quickview/bug/CSCwk05814
WEB https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose

Advisory provided by GitHub Security Advisory Database. Published: May 6, 2024, Modified: July 1, 2024

References

https://datatracker.ietf.org/doc/html/rfc2131#section-7
https://datatracker.ietf.org/doc/html/rfc3442#section-7
https://tunnelvisionbug.com/
https://www.leviathansecurity.com/research/tunnelvision
https://news.ycombinator.com/item?id=40279632
https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/
https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/
https://issuetracker.google.com/issues/263721377
https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvision
https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerability
https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffic
https://news.ycombinator.com/item?id=40284111
https://www.agwa.name/blog/post/hardening_openvpn_for_def_con
https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp/
https://support.citrix.com/article/CTX677069/cloud-software-group-security-advisory-for-cve20243661
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00009
https://bst.cisco.com/quickview/bug/CSCwk05814
https://security.paloaltonetworks.com/CVE-2024-3661
https://fortiguard.fortinet.com/psirt/FG-IR-24-170
https://my.f5.com/manage/s/article/K000139553
Published: 2024-05-06T18:31:21.217Z
Last Modified: 2024-08-28T19:09:06.995Z
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