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The Zone-Based Firewall (ZBFW) functionality in Cisco IOS, possibly 15.4 and earlier, and IOS XE, possibly 3.13 and earlier, mishandles zone checking for existing sessions, which allows remote attackers to bypass intended resource-access restrictions via spoofed traffic that matches one of these sessions, aka Bug IDs CSCun94946 and CSCun96847.
Base Score: 4.3
Impact Score: 2.9
Exploitability Score: 8.6
Base Score: 6.5
Impact Score: 3.6
Exploitability Score: 2.8
cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:* versions up to 15.4\(1\)t1 (inclusive)
cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:* versions up to 15.4\(3\)s (inclusive)