CVE-2007-2243

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2007-04-25 · updated 2026-06-16
Weakness: CWE-287

Description

OpenSSH 4.6 and earlier, when ChallengeResponseAuthentication is enabled, allows remote attackers to determine the existence of user accounts by attempting to authenticate via S/KEY, which displays a different response if the user account exists, a similar issue to CVE-2001-1483.

Affected products

OpenSSH: 1.2, 1.2.1, 1.2.2, 1.2.3, 1.2.27, 2.1 (+56)

References

http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053906.html
http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053951.html
http://securityreason.com/securityalert/2631
http://www.osvdb.org/34600
http://www.securityfocus.com/bid/23601
https://exchange.xforce.ibmcloud.com/vulnerabilities/33794
https://security.netapp.com/advisory/ntap-20191107-0003/
http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053906.html
http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053951.html
http://securityreason.com/securityalert/2631
http://www.osvdb.org/34600
http://www.securityfocus.com/bid/23601

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