CVE-2024-3661
HIGHCVSS 7.6/10EPSS 4.06%
Last modified
CVE-2024-3661 is a high-severity vulnerability rated 7.6/10 on the CVSS scale. 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. EPSS estimates a 4.06% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Fortinet | Forticlient | >= 6.4.0, < 7.2.5 |
| Fortinet | Forticlient | 7.4.0 |
| Cisco | Anyconnect Vpn Client | All versions |
| Cisco | Secure Client | All versions |
| Paloaltonetworks | Globalprotect | All versions |
| Citrix | Secure Access Client | < 24.06.1 |
| Citrix | Secure Access Client | < 24.8.5 |
| F5 | Big-Ip Access Policy Manager | >= 7.2.3, <= 7.2.5 |
| F5 | Big-Ip Access Policy Manager | >= 15.1.0, <= 15.1.10 |
| F5 | Big-Ip Access Policy Manager | >= 16.1.0, <= 16.1.5 |
| F5 | Big-Ip Access Policy Manager | >= 17.1.0, <= 17.1.2 |
| Watchguard | Ipsec Mobile Vpn Client | All versions |
| Watchguard | Mobile Vpn With Ssl | All versions |
| Zscaler | Client Connector | < 1.5.1.25 |
| Zscaler | Client Connector | < 4.2.0.282 |
| Zscaler | Client Connector | >= 3.7, < 3.7.0.134 |
| Zscaler | Client Connector | All versions |
References
- https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/Exploit, Press/Media Coverage
- https://bst.cisco.com/quickview/bug/CSCwk05814Third Party Advisory, Vendor Advisory
- https://fortiguard.fortinet.com/psirt/FG-IR-24-170Vendor Advisory
- https://issuetracker.google.com/issues/263721377Issue Tracking
- https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/Exploit, Press/Media Coverage
- https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvisionThird Party Advisory
- https://my.f5.com/manage/s/article/K000139553Vendor Advisory
- https://news.ycombinator.com/item?id=40279632Issue Tracking
- https://news.ycombinator.com/item?id=40284111Issue Tracking
- https://security.paloaltonetworks.com/CVE-2024-3661Vendor Advisory
- https://tunnelvisionbug.com/Exploit, Third Party Advisory
- https://www.leviathansecurity.com/research/tunnelvisionThird Party Advisory
- https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp/Exploit, Press/Media Coverage
- https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00009Mitigation, Third Party Advisory, Vendor Advisory
- https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerabilityExploit, Third Party Advisory, Vendor Advisory
- https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/Exploit, Press/Media Coverage
- https://bst.cisco.com/quickview/bug/CSCwk05814Third Party Advisory, Vendor Advisory
- https://fortiguard.fortinet.com/psirt/FG-IR-24-170Vendor Advisory
- https://issuetracker.google.com/issues/263721377Issue Tracking
- https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/Exploit, Press/Media Coverage
- https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvisionThird Party Advisory
- https://my.f5.com/manage/s/article/K000139553Vendor Advisory
- https://news.ycombinator.com/item?id=40279632Issue Tracking
- https://news.ycombinator.com/item?id=40284111Issue Tracking
- https://security.paloaltonetworks.com/CVE-2024-3661Vendor Advisory
- https://tunnelvisionbug.com/Exploit, Third Party Advisory
- https://www.leviathansecurity.com/research/tunnelvisionThird Party Advisory
- https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp/Exploit, Press/Media Coverage
- https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00009Mitigation, Third Party Advisory, Vendor Advisory
- https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerabilityExploit, Third Party Advisory, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2024-3661?
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.
How severe is CVE-2024-3661?
CVE-2024-3661 has a CVSS score of 7.6/10 (HIGH severity). The EPSS model estimates a 4.06% probability of exploitation in the next 30 days.
How do I fix CVE-2024-3661?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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