UpHeron
All vulnerabilities

Servers and applications

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.

Severity
Medium 5.0
Published
12 May 2003
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Fixed in
3.6.1
Exploit chance
77% in the next 30 daysHigher than 99% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Observable discrepancy (CWE-203)
Attack
Over the network · No login needed
Attacker can
Read some data
CVSS vector
AV:N/AC:L/Au:N/C:P/I:N/A:N
Sources
NVD

Affected software

SoftwareAffected versions
OpenSSHServers and applications · cpe:a:openbsd:openssh
  • Every version before 3.6.1
  • Version 3.6.1-p1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2003-0190
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2003-0190