CVE-2024-3661: high-severity vulnerability in IETF DHCP
DHCP routing options can manipulate interface-based VPN traffic
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.6epss 4.1%
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.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Affected products
IETF · DHCPReferences
https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/https://bst.cisco.com/quickview/bug/CSCwk05814https://datatracker.ietf.org/doc/html/rfc2131#section-7https://datatracker.ietf.org/doc/html/rfc3442#section-7https://fortiguard.fortinet.com/psirt/FG-IR-24-170https://issuetracker.google.com/issues/263721377https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffichttps://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvisionhttps://my.f5.com/manage/s/article/K000139553https://news.ycombinator.com/item?id=40279632https://news.ycombinator.com/item?id=40284111