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Vulnerabilities

Vulnerability · CVE-2007-2243

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/KE

Published Apr 25, 2007 · catalog updated Oct 21, 2026 · OpenSSH 4.6 and earlier,

Check if you run it

No confirmed exploitation is on record for CVE-2007-2243. EPSS is 2.40%. Act only if a listed version of OpenSSH 4.6 and earlier, is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (OpenSSH 4.6 and earlier,).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.40%
Remediation
Advisory link
Affected products
Debian:12 openssh · Debian:13 openssh · Debian:14 openssh

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 openssh1:10.0p1-1, 1:10.0p1-2, 1:10.0p1-3
  • Debian:13 openssh1:10.0p1-7, 1:10.0p1-7+deb13u1, 1:10.0p1-7+deb13u2
  • Debian:14 openssh1:10.0p1-7, 1:10.0p1-8, 1:10.1p1-1

How to fix CVE-2007-2243

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2007-2243. EPSS is 2.40%. Act only if a listed version of OpenSSH 4.6 and earlier, is installed.

Which versions are affected?

Compare what you have installed with 1:10.0p1-1, 1:10.0p1-2, 1:10.0p1-3, 1:10.0p1-7, 1:10.0p1-7+deb13u1, 1:10.0p1-7+deb13u2, 1:10.0p1-7, 1:10.0p1-8, 1:10.1p1-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 2.40%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 25, 2007 · OpenSSF OSV / OSV Scanner

    Detected

    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.

  2. Oct 21, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2007-2243

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2007-2243

    30-day exploitation probability 2.40%

    first.org
  • OpenSSF OSV / OSV ScannerPackage advisoryDEBIAN-CVE-2007-2243
    osv.dev
  • Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2007-2243

    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.

    osv.dev

References

Freshness

Last verified in this catalog Oct 21, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.