CVE-2025-52469

Chamilo LMS prior to version 1.11.30 contains a logic vulnerability in the social network/ friend-request workflow that allows an authenticated user to forcibly add any user as a friend by directly calling the AJAX endpoint, bypassing normal send/accept flows and even adding non-existent users. T...

CVE-2025-52469

Chamilo is a learning management system. Prior to version 1.11.30, a logic vulnerability in the friend request workflow of Chamilo’s social network module allows an authenticated user to forcibly add any user as a friend by directly calling the AJAX endpoint. The attacker can bypass the normal fl...

CVE-2025-9824

The CVE-2025-9824 issue stems from different login response times for existing versus non-existent users in Mautic, enabling user enumeration and potential brute-force attempts. Technical details describe that valid usernames trigger password hashing while invalid ones do not; the fix adds a Timi...

A flaw was found in Linux-Pam in versions prior to 1.5.1 in the way it handle empty passwords for non-existing users. When the user doesn't exist PAM try to authenticate with root and in the case of an empty password it successfully authenticate.

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NewStart CGSL MAIN 4.05 : openssh Multiple Vulnerabilities (NS-SA-2019-0139)

The remote NewStart CGSL host, running version MAIN 4.05, has openssh packages installed that are affected by multiple vulnerabilities: - A covert timing channel flaw was found in the way OpenSSH handled authentication of non-existent users. A remote unauthenticated attacker could possibly use th...

Medium: openssh

Issue Overview: A covert timing channel flaw was found in the way OpenSSH handled authentication of non-existent users. A remote unauthenticated attacker could possibly use this flaw to determine valid user names by measuring the timing of server responses. CVE-2016-6210 It was found that OpenSSH...

EulerOS 2.0 SP1 : openssh (EulerOS-SA-2017-1189)

According to the version of the openssh packages installed, the EulerOS installation on the remote host is affected by the following vulnerability : - A covert timing channel flaw was found in the way OpenSSH handled authentication of non-existent users. A remote unauthenticated attacker could...

openssh, pam_ssh_agent_auth security update

CentOS Errata and Security Advisory CESA-2017:2563 An update for openssh is now available for Red Hat Enterprise Linux 6. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity...

openssh: User enumeration via covert timing channel

A covert timing channel flaw was found in the way OpenSSH handled authentication of non-existent users. A remote unauthenticated attacker could possibly use this flaw to determine valid user names by measuring the timing of server responses...

PT-2017-19316 · Osnexus · Quantastor

Name of the Vulnerable Software and Affected Versions: OSNEXUS QuantaStor versions prior to 4.3.1 Description: A flaw was found in the error message sent as a response for non-existent users on the system. This could allow an attacker to enumerate valid accounts by searching for common usernames...

openssh: User enumeration via covert timing channel

A covert timing channel flaw was found in the way OpenSSH handled authentication of non-existent users. A remote unauthenticated attacker could possibly use this flaw to determine valid user names by measuring the timing of server responses...

tomcat: timing attack in Realm implementation

The Realm implementations did not process the supplied password if the supplied user name did not exist. This made a timing attack possible to determine valid user names. Note that the default configuration includes the LockOutRealm which makes exploitation of this vulnerability harder...

BSA-2016-195

Security Advisory ID : BSA-2016-195 Component : OpenSSH Revision : 2.0: Final sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing, uses BLOWFISH hashing on a static password when the username does not exist, which allows remote attackers to enumerate users by...

pam_krb5: Password prompt varies for existent and non-existent users

pamkrb5 2.2.14 through 2.3.4, as used in Red Hat Enterprise Linux RHEL 5, generates different password prompts depending on whether the user account exists, which allows remote attackers to enumerate valid usernames...

DSA-198 nullmailer - denial of service

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