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    CVE-2003-0190

    OpenSSH-portable (OpenSSH) 3.6.1p1 and earlier with PAM support enabled immediately sends an error message when a user does not exist, which allows remote attackers to determine valid usernames via a timing attack.

    Published:Apr 30, 2003
    Last Modified:Apr 16, 2026
    EPS:May 2, 2003
    EPSS Score:0.22646
    CVSS Score:5

    Affected Products

    Vendor
    Openbsd
    Product
    Openssh
    Vendor
    Openpkg
    Product
    Openpkg
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Linux
    Vendor
    Siemens
    Product
    Scalance X204rna
    Vendor
    Siemens
    Product
    Scalance X204rna Ecc
    Vendor
    Siemens
    Product
    Scalance X204rna Ecc Firmware
    Vendor
    Siemens
    Product
    Scalance X204rna Firmware

    Exploits

    http://www.securityfocus.com/bid/7467http://www.securityfocus.com/bid/7467https://www.exploit-db.com/exploits/26https://www.exploit-db.com/exploits/25https://www.exploit-db.com/exploits/3303

    Common Weakness Enumeration

    CWE-203 Observable Discrepancy

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-189 Black Box Reverse Engineering

    Related CVEs

    CVE-2026-73283 (CVSS 2.5) — In sshd in OpenSSH before 10.5, the restrict keyword (in authorized_keys) was supposed to be applicable to tun…
    CVE-2026-73282 (CVSS 4.8) — In ssh in OpenSSH before 10.5, a use-after-free for realloc data can occur if a certain pair of remote-forward…
    CVE-2026-73281 (CVSS 3.5) — In ssh-agent in OpenSSH before 10.5, some operations can occur remotely but were intended to occur only locall…
    CVE-2026-60002 (CVSS 7.7) — ssh in OpenSSH before 10.4 can have a use-after-free when a server changes its host key during a key re-exchan…
    CVE-2026-60001 (CVSS 6.5) — sshd in OpenSSH before 10.4 does not always honor the minimum authentication delay.…
    CVE-2026-60000 (CVSS 3.7) — sshd in OpenSSH before 10.4 allows remote attackers to cause a denial of service (resource consumption from ex…
    CVE-2026-59999 (CVSS 5.9) — In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, b…
    CVE-2026-59998 (CVSS 4.8) — sshd in OpenSSH before 10.4 has an undocumented security-relevant behavior: GSSAPIStrictAcceptorCheck has no v…
    CVE-2026-59997 (CVSS 4.2) — internal-sftp in sshd in OpenSSH before 10.4 recognizes only the first 9 command-line arguments, which can be …
    CVE-2026-59996 (CVSS 4.2) — scp in OpenSSH before 10.4 may place a file in the parent directory of an intended directory when the copy occ…

    References

    http://lab.mediaservice.net/advisory/2003-01-openssh.txt
    http://lists.grok.org.uk/pipermail/full-disclosure/2003-April/004815.html
    http://marc.info/?l=bugtraq&m=105172058404810&w=2
    http://marc.info/?l=bugtraq&m=106018677302607&w=2
    http://www.redhat.com/support/errata/RHSA-2003-222.html
    http://www.redhat.com/support/errata/RHSA-2003-224.html
    http://www.securityfocus.com/bid/7467
    http://www.turbolinux.com/security/TLSA-2003-31.txt
    https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A445
    http://lab.mediaservice.net/advisory/2003-01-openssh.txt
    http://lists.grok.org.uk/pipermail/full-disclosure/2003-April/004815.html
    http://marc.info/?l=bugtraq&m=105172058404810&w=2
    http://marc.info/?l=bugtraq&m=106018677302607&w=2
    http://www.redhat.com/support/errata/RHSA-2003-222.html
    http://www.redhat.com/support/errata/RHSA-2003-224.html
    http://www.securityfocus.com/bid/7467
    http://www.turbolinux.com/security/TLSA-2003-31.txt
    https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A445

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High