The Flex-VPN load-balancing feature in the ipsec-ikev2 implementation in Cisco IOS before 15.1(1)SY3 does not require authentication, which allows remote attackers to trigger the forwarding of VPN traffic to an attacker-controlled destination, or the discarding of this traffic, by arranging for an arbitrary device to become a cluster member, aka Bug ID CSCub93641.
2014-04-23T11:52:59.167
2025-04-12T10:46:40.837
Deferred
CVSSv2: 6.4 (MEDIUM)
AV:N/AC:L/Au:N/C:N/I:P/A:P
10.0
4.9
Type | Vendor | Product | Version/Range | Vulnerable? |
---|---|---|---|---|
Operating System | cisco | ios | ≤ 15.1\(1\)sy2 | Yes |
Operating System | cisco | ios | 15.1 | Yes |
Operating System | cisco | ios | 15.1\(1\)sy | Yes |
Operating System | cisco | ios | 15.1\(1\)sy1 | Yes |