CVE-2024-3661

DHCP routing options can manipulate interface-based VPN traffic

HIGH
7.6
CVSS Score
Published: May 6, 2024 at 06:31 PM UTC
Updated: June 17, 2026 at 07:44 AM UTC
10 products affected across 8 vendorsBig IP Access Policy ManagerForticlientClient Connector· also runs on 3 platforms

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Severity
HIGH7.6
Exploit prediction
EPSS 4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 24.06.1v < 24.8.5
Affected range stops below 24.06.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 24.8.5, so it looks safe — our inference, not a vendor statement
apple-iphone-os (environment) · apple-macos (environment) · linux-linux-kernel (environment)
15.1.0 ≤ v ≤ 15.1.1016.1.0 ≤ v ≤ 16.1.517.1.0 ≤ v ≤ 17.1.27.2.3 ≤ v ≤ 7.2.5
6.4.0 ≤ v < 7.2.57.4.0
Affected range stops below 7.2.5, so it looks safe — our inference, not a vendor statement
v < 1.5.1.25v < 4.2.0.2823.7 ≤ v < 3.7.0.134
Affected range stops below 1.5.1.25, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.7.0.134, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.2.0.282, so it looks safe — our inference, not a vendor statement
All versions

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

References (20)

Third Party AdvisoryVendor Advisory
Source: 9119a7d8-5eab-497f-8521-727c672e3725
https://bst.cisco.com/quickview/bug/CSCwk05814
Related
Source: 9119a7d8-5eab-497f-8521-727c672e3725
https://datatracker.ietf.org/doc/html/rfc2131#section-7
Related
Source: 9119a7d8-5eab-497f-8521-727c672e3725
https://datatracker.ietf.org/doc/html/rfc3442#section-7
Vendor Advisory
Source: 9119a7d8-5eab-497f-8521-727c672e3725
https://fortiguard.fortinet.com/psirt/FG-IR-24-170
Issue Tracking
Source: 9119a7d8-5eab-497f-8521-727c672e3725
https://issuetracker.google.com/issues/263721377
ExploitPress/Media Coverage
Source: 9119a7d8-5eab-497f-8521-727c672e3725
https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.6HIGHcisa-cg
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusANALYZED
CWE
CWE-306CWE-501

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