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.

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Source ID Title
EUVD EUVD EUVD-2011-0557 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.
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 29 May 2026 21:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-457
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-05-29T20:34:45.288Z

Reserved: 2011-01-20T00:00:00.000Z

Link: CVE-2011-0539

cve-icon Vulnrichment

Updated: 2024-08-06T21:58:25.891Z

cve-icon NVD

Status : Modified

Published: 2011-02-10T18:00:57.660

Modified: 2026-05-29T21:16:24.693

Link: CVE-2011-0539

cve-icon Redhat

Severity : Low

Publid Date: 2011-02-04T00:00:00Z

Links: CVE-2011-0539 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses