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    CVE-2011-0539

    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.

    Published:Feb 4, 2011
    Last Modified:May 29, 2026
    EPS:Feb 10, 2011
    EPSS Score:0.01274
    CVSS Score:7.5

    Affected Products

    Vendor
    Openbsd
    Product
    Openssh

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-457 Use of Uninitialized Variable

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-73283 (CVSS 2.5) — In sshd in OpenSSH before 10.5, the restrict keyword (in authorized_keys) was supposed to be applicable to tun…
    CVE-2026-73282 (CVSS 4.8) — In ssh in OpenSSH before 10.5, a use-after-free for realloc data can occur if a certain pair of remote-forward…
    CVE-2026-73281 (CVSS 3.5) — In ssh-agent in OpenSSH before 10.5, some operations can occur remotely but were intended to occur only locall…
    CVE-2026-60002 (CVSS 7.7) — ssh in OpenSSH before 10.4 can have a use-after-free when a server changes its host key during a key re-exchan…
    CVE-2026-60001 (CVSS 6.5) — sshd in OpenSSH before 10.4 does not always honor the minimum authentication delay.…
    CVE-2026-60000 (CVSS 3.7) — sshd in OpenSSH before 10.4 allows remote attackers to cause a denial of service (resource consumption from ex…
    CVE-2026-59999 (CVSS 5.9) — In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, b…
    CVE-2026-59998 (CVSS 4.8) — sshd in OpenSSH before 10.4 has an undocumented security-relevant behavior: GSSAPIStrictAcceptorCheck has no v…
    CVE-2026-59997 (CVSS 4.2) — internal-sftp in sshd in OpenSSH before 10.4 recognizes only the first 9 command-line arguments, which can be …
    CVE-2026-59996 (CVSS 4.2) — scp in OpenSSH before 10.4 may place a file in the parent directory of an intended directory when the copy occ…

    References

    http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02794777
    http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10673
    http://secunia.com/advisories/43181
    http://secunia.com/advisories/44269
    http://www.openssh.com/txt/legacy-cert.adv
    http://www.openwall.com/lists/oss-security/2011/02/04/2
    http://www.securityfocus.com/bid/46155
    http://www.securitytracker.com/id?1025028
    http://www.vupen.com/english/advisories/2011/0284
    https://exchange.xforce.ibmcloud.com/vulnerabilities/65163
    http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02794777
    http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10673
    http://secunia.com/advisories/43181
    http://secunia.com/advisories/44269
    http://www.openssh.com/txt/legacy-cert.adv
    http://www.openwall.com/lists/oss-security/2011/02/04/2
    http://www.securityfocus.com/bid/46155
    http://www.securitytracker.com/id?1025028
    http://www.vupen.com/english/advisories/2011/0284
    https://exchange.xforce.ibmcloud.com/vulnerabilities/65163

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High