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A vulnerability in the mobility tunnel DTLS connection management of Cisco Catalyst 9800 Wireless Controllers could allow an unauthenticated, remote attacker to downgrade the encryption cipher of mobility data tunnels established between wireless controllers within the same mobility group. The vulnerability is due to a logic error when establishing the DTLS tunnel. An attacker could exploit this vulnerability by breaking up the DTLS connection between the affected devices and, resorting to a machine-in-the-middle attack, setting up the tunnel with arbitrary parameters. A successful exploit would result in the attacker's ability to remove the encryption settings of the mobility data tunnel and view any traffic traversing it.
This vulnerability affects Cisco Catalyst 9800 Wireless Controllers configured with a mobility group where the data tunnel is set to be encrypted. This configuration is disabled by default.
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The Cisco PSIRT has assigned this bug the following CVSS version 3.1 score. The Base CVSS score as of the time of evaluation is 4.0: https://sec.cloudapps.cisco.com/security/center/cvssCalculator.x?vector=CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N No CVE ID has been assigned to this issue. Information about Fixed, Vulnerable, and Non-vulnerable releases--as well as information about fixed release availability--is not maintained by Cisco PSIRT. Please refer to the appropriate fields in this bug. If you require additional help to obtain this information, please open a support case with your support organization. Additional information on Cisco's security vulnerability policy can be found at the following URL: https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html
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