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    CVE-2023-25136

    OpenSSH server (sshd) 9.1 introduced a double-free vulnerability during options.kex_algorithms handling. This is fixed in OpenSSH 9.2. The double free can be leveraged, by an unauthenticated remote attacker in the default configuration, to jump to any location in the sshd address space. One third-party report states "remote code execution is theoretically possible."

    Published:Feb 3, 2023
    Last Modified:May 28, 2026
    EPS:Feb 3, 2023
    EPSS Score:0.88329
    CVSS Score:6.5

    Affected Products

    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Netapp
    Product
    500f
    Vendor
    Netapp
    Product
    500f Firmware
    Vendor
    Netapp
    Product
    A250
    Vendor
    Netapp
    Product
    A250 Firmware
    Vendor
    Netapp
    Product
    C250
    Vendor
    Netapp
    Product
    C250 Firmware
    Vendor
    Netapp
    Product
    Ontap Select Deploy Administration Utility
    Vendor
    Openbsd
    Product
    Openssh
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    https://bugzilla.mindrot.org/show_bug.cgi?id=3522https://jfrog.com/blog/openssh-pre-auth-double-free-cve-2023-25136-writeup-and-proof-of-concept/https://www.openwall.com/lists/oss-security/2023/02/02/2https://bugzilla.mindrot.org/show_bug.cgi?id=3522https://jfrog.com/blog/openssh-pre-auth-double-free-cve-2023-25136-writeup-and-proof-of-concept/https://www.openwall.com/lists/oss-security/2023/02/02/2https://github.com/adhikara13/CVE-2023-25136https://github.com/axylisdead/CVE-2023-25136_POChttps://github.com/Business1sg00d/CVE-2023-25136https://github.com/Christbowel/CVE-2023-25136https://github.com/H4K6/CVE-2023-25136https://github.com/jfrog/jfrog-CVE-2023-25136-OpenSSH_Double-Freehttps://github.com/Lane0218/CVE-2023-25136-PoChttps://github.com/malvika-thakur/CVE-2023-25136https://github.com/mrmtwoj/CVE-2023-25136https://github.com/nhakobyan685/CVE-2023-25136https://github.com/ticofookfook/CVE-2023-25136

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    http://www.openwall.com/lists/oss-security/2023/02/13/1
    http://www.openwall.com/lists/oss-security/2023/02/22/1
    http://www.openwall.com/lists/oss-security/2023/02/22/2
    http://www.openwall.com/lists/oss-security/2023/02/23/3
    http://www.openwall.com/lists/oss-security/2023/03/06/1
    http://www.openwall.com/lists/oss-security/2023/03/09/2
    https://bugzilla.mindrot.org/show_bug.cgi?id=3522
    https://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/017_sshd.patch.sig
    https://github.com/openssh/openssh-portable/commit/486c4dc3b83b4b67d663fb0fa62bc24138ec3946
    https://jfrog.com/blog/openssh-pre-auth-double-free-cve-2023-25136-writeup-and-proof-of-concept/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JGAUIXJ3TEKCRKVWFQ6GDAGQFTIIGQQP/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7LKQDFZWKYHQ65TBSH2X2HJQ4V2THS3/
    https://news.ycombinator.com/item?id=34711565
    https://security.gentoo.org/glsa/202307-01
    https://security.netapp.com/advisory/ntap-20230309-0003/
    https://www.openwall.com/lists/oss-security/2023/02/02/2
    http://www.openwall.com/lists/oss-security/2023/02/13/1
    http://www.openwall.com/lists/oss-security/2023/02/22/1
    http://www.openwall.com/lists/oss-security/2023/02/22/2
    http://www.openwall.com/lists/oss-security/2023/02/23/3
    http://www.openwall.com/lists/oss-security/2023/03/06/1
    http://www.openwall.com/lists/oss-security/2023/03/09/2
    https://bugzilla.mindrot.org/show_bug.cgi?id=3522
    https://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/017_sshd.patch.sig
    https://github.com/openssh/openssh-portable/commit/486c4dc3b83b4b67d663fb0fa62bc24138ec3946
    https://jfrog.com/blog/openssh-pre-auth-double-free-cve-2023-25136-writeup-and-proof-of-concept/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JGAUIXJ3TEKCRKVWFQ6GDAGQFTIIGQQP/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7LKQDFZWKYHQ65TBSH2X2HJQ4V2THS3/
    https://news.ycombinator.com/item?id=34711565
    https://security.gentoo.org/glsa/202307-01
    https://security.netapp.com/advisory/ntap-20230309-0003/
    https://www.openwall.com/lists/oss-security/2023/02/02/2

    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