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    CVE-2016-10012

    The shared memory manager (associated with pre-authentication compression) in sshd in OpenSSH before 7.4 does not ensure that a bounds check is enforced by all compilers, which might allows local users to gain privileges by leveraging access to a sandboxed privilege-separation process, related to the m_zback and m_zlib data structures.

    Published:Dec 19, 2016
    Last Modified:May 29, 2026
    EPS:Jan 5, 2017
    EPSS Score:0.00021
    CVSS Score:7.8

    Affected Products

    Vendor
    Openbsd
    Product
    Openssh
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-100 Overflow Buffers
    CAPEC-114 Authentication Abuse
    CAPEC-115 Authentication Bypass
    CAPEC-123 Buffer Manipulation
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-151 Identity Spoofing
    CAPEC-194 Fake the Source of Data
    CAPEC-22 Exploiting Trust in Client
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-42 MIME Conversion
    CAPEC-44 Overflow Binary Resource File
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-57 Utilizing REST's Trust in the System Resource to Obtain Sensitive Data
    CAPEC-593 Session Hijacking
    CAPEC-633 Token Impersonation
    CAPEC-650 Upload a Web Shell to a Web Server
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities
    CAPEC-94 Adversary in the Middle (AiTM)

    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://www.openwall.com/lists/oss-security/2016/12/19/2
    http://www.securityfocus.com/bid/94975
    http://www.securitytracker.com/id/1037490
    http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.647637
    https://access.redhat.com/errata/RHSA-2017:2029
    https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
    https://github.com/openbsd/src/commit/3095060f479b86288e31c79ecbc5131a66bcd2f9
    https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
    https://security.netapp.com/advisory/ntap-20171130-0002/
    https://support.f5.com/csp/article/K62201745?utm_source=f5support&amp%3Butm_medium=RSS
    https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03818en_us
    https://www.openssh.com/txt/release-7.4
    http://www.openwall.com/lists/oss-security/2016/12/19/2
    http://www.securityfocus.com/bid/94975
    http://www.securitytracker.com/id/1037490
    http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.647637
    https://access.redhat.com/errata/RHSA-2017:2029
    https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
    https://github.com/openbsd/src/commit/3095060f479b86288e31c79ecbc5131a66bcd2f9
    https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
    https://security.netapp.com/advisory/ntap-20171130-0002/
    https://support.f5.com/csp/article/K62201745?utm_source=f5support&amp%3Butm_medium=RSS
    https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03818en_us
    https://www.openssh.com/txt/release-7.4

    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