H3C SSL VPN contains a user enumeration vulnerability that allows attackers to identify valid usernames through the 'txtUsrName' POST parameter. Attackers can submit different usernames to the login_submit.cgi endpoint and analyze response messages to distinguish between existing and non-existing accounts.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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