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
Published Apr 25, 2007
5.0
MEDIUMCVSS 2.0
EPSS 2.47%
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
No data.
- 1.2
- 1.2.1
- 1.2.2
- 1.2.3
- 1.2.27
- 2.1
- 2.1.1
- 2.2
- 2.3
- 2.5
- 2.5.1
- 2.5.2
- 2.9
- 2.9.9
- 2.9.9p2
- 2.9p1
- 2.9p2
- 3.0
- 3.0.1
- 3.0.1p1
- 3.0.2
- 3.0.2p1
- 3.0p1
- 3.1
- 3.1p1
- 3.2
- 3.2.2
- 3.2.2p1
- 3.2.3p1
- 3.3
- 3.3p1
- 3.4
- 3.4p1
- 3.5
- 3.5p1
- 3.6
- 3.6.1
- 3.6.1p1
- 3.6.1p2
- 3.7
- 3.7.1
- 3.7.1p1
- 3.7.1p2
- 3.8
- 3.8.1
- 3.8.1p1
- 3.9
- 3.9.1
- 3.9.1p1
- 4.0
- 4.0p1
- 4.1
- 4.1p1
- 4.2
- 4.2p1
- 4.3
- 4.3p1
- 4.3p2
- 4.4
- 4.4p1
- 4.5
- 4.6
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. The OpenSSH packages as shipped with Red Hat Enterprise Linux do not contain S/KEY support.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (18 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.47% (0.02472) | 83.95th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.47% (0.02472) | 82.39th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.52% (0.00519) | 64.82th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.72% (0.00721) | 81.26th | v3 (v2023.03.01) |
| Jun 20, 2024 | 0.72% (0.00721) | 80.69th | v3 (v2023.03.01) |
| Apr 5, 2024 | 0.95% (0.00954) | 82.92th | v3 (v2023.03.01) |
| Feb 27, 2024 | 1.00% (0.01005) | 83.22th | v3 (v2023.03.01) |
| Jan 20, 2024 | 0.93% (0.00933) | 81.30th | v3 (v2023.03.01) |
| Dec 13, 2023 | 0.81% (0.00812) | 79.80th | v3 (v2023.03.01) |
| Sep 27, 2023 | 0.75% (0.00751) | 78.80th | v3 (v2023.03.01) |
| Aug 20, 2023 | 0.70% (0.00699) | 77.77th | v3 (v2023.03.01) |
| Jul 15, 2023 | 0.66% (0.00665) | 77.00th | v3 (v2023.03.01) |
| May 1, 2023 | 0.65% (0.00652) | 76.42th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.60% (0.00603) | 75.20th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.32% (0.01319) | 71.27th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.32% (0.01319) | 71.23th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.32% (0.01319) | 69.22th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.32% (0.01319) | 44.98th | v2 (v2022.01.01) |
References (10)
- http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053906.html mailing-listx_refsource_FULLDISC
- http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053951.html mailing-listx_refsource_FULLDISC
- http://securityreason.com/securityalert/2631 third-party-advisoryx_refsource_SREASON
- http://www.osvdb.org/34600 vdb-entryx_refsource_OSVDB
- http://www.securityfocus.com/bid/23601 vdb-entryx_refsource_BID
- https://access.redhat.com/security/cve/CVE-2007-2243 Vendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/33794 vdb-entryx_refsource_XF
- https://nvd.nist.gov/vuln/detail/CVE-2007-2243
- https://security.netapp.com/advisory/ntap-20191107-0003/ x_refsource_CONFIRM
- https://www.cve.org/CVERecord?id=CVE-2007-2243
| Link | Providers | Tags |
|---|---|---|
| http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053906.html | mailing-listx_refsource_FULLDISC | |
| http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053951.html | mailing-listx_refsource_FULLDISC | |
| http://securityreason.com/securityalert/2631 | third-party-advisoryx_refsource_SREASON | |
| http://www.osvdb.org/34600 | vdb-entryx_refsource_OSVDB | |
| http://www.securityfocus.com/bid/23601 | vdb-entryx_refsource_BID | |
| https://access.redhat.com/security/cve/CVE-2007-2243 | Vendor Advisory | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/33794 | vdb-entryx_refsource_XF | |
| https://nvd.nist.gov/vuln/detail/CVE-2007-2243 | ||
| https://security.netapp.com/advisory/ntap-20191107-0003/ | x_refsource_CONFIRM | |
| https://www.cve.org/CVERecord?id=CVE-2007-2243 |
Change history (0)
No recorded changes yet.