OpenSSH: legacy certificate generation information leak
Published Feb 10, 2011
7.5
HIGHCVSS 3.1
EPSS 1.81%
Description
The key_certify function in usr.bin/ssh/key.c in OpenSSH 5.6 and 5.7, when generating legacy certificates using the -t command-line option in ssh-keygen, does not initialize the nonce field, which might allow remote attackers to obtain sensitive stack memory contents or make it easier to conduct hash collision attacks.
Affected products
No data.
No data.
Red Hat Enterprise Linux 4
openssh
Not affected
Red Hat Enterprise Linux 5
openssh
Not affected
Red Hat Enterprise Linux 6
openssh
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | openssh | Not affected | n/a |
| Red Hat Enterprise Linux 5 | openssh | Not affected | n/a |
| Red Hat Enterprise Linux 6 | openssh | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the versions of openssh as shipped with Red Hat Enterprise Linux 4, 5, or 6.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed May 29, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 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 (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 1.81% (0.01812) | 77.89th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.80% (0.01797) | 75.52th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.72% (0.01721) | 80.71th | v4 (v2025.03.14) |
| Mar 29, 2025 | 4.01% (0.04012) | 80.45th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.72% (0.01721) | 81.15th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.70% (0.00701) | 80.95th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.70% (0.00701) | 79.66th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.70% (0.00701) | 77.22th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.17% (0.02172) | 80.77th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.17% (0.02172) | 78.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.17% (0.02172) | 57.73th | v2 (v2022.01.01) |
References (14)
- http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02794777 vendor-advisoryx_refsource_HP
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10673 x_refsource_CONFIRM
- http://secunia.com/advisories/43181 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://secunia.com/advisories/44269 third-party-advisoryx_refsource_SECUNIA
- http://www.openssh.com/txt/legacy-cert.adv x_refsource_CONFIRMPatchVendor Advisory
- http://www.openwall.com/lists/oss-security/2011/02/04/2 mailing-listx_refsource_MLIST
- http://www.securityfocus.com/bid/46155 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id?1025028 vdb-entryx_refsource_SECTRACK
- http://www.vupen.com/english/advisories/2011/0284 vdb-entryx_refsource_VUPENVendor Advisory
- https://access.redhat.com/security/cve/CVE-2011-0539 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=675254 Issue Tracking
- https://exchange.xforce.ibmcloud.com/vulnerabilities/65163 vdb-entryx_refsource_XF
- https://nvd.nist.gov/vuln/detail/CVE-2011-0539
- https://www.cve.org/CVERecord?id=CVE-2011-0539
Change history (0)
No recorded changes yet.