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    CVE-2003-0693

    A "buffer management error" in buffer_append_space of buffer.c for OpenSSH before 3.7 may allow remote attackers to execute arbitrary code by causing an incorrect amount of memory to be freed and corrupting the heap, a different vulnerability than CVE-2003-0695.

    Published:Sep 15, 2003
    Last Modified:Apr 16, 2026
    EPS:Sep 17, 2003
    EPSS Score:0.26823
    CVSS Score:10

    Affected Products

    Vendor
    Openbsd
    Product
    Openssh
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Linux

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    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://lists.grok.org.uk/pipermail/full-disclosure/2003-September/010103.html
    http://lists.grok.org.uk/pipermail/full-disclosure/2003-September/010135.html
    http://lists.grok.org.uk/pipermail/full-disclosure/2003-September/010146.html
    http://marc.info/?l=bugtraq&m=106373247528528&w=2
    http://marc.info/?l=bugtraq&m=106373546332230&w=2
    http://marc.info/?l=bugtraq&m=106374466212309&w=2
    http://marc.info/?l=bugtraq&m=106381396120332&w=2
    http://marc.info/?l=bugtraq&m=106381409220492&w=2
    http://sunsolve.sun.com/search/document.do?assetkey=1-77-1000620.1-1
    http://www.cert.org/advisories/CA-2003-24.html
    http://www.debian.org/security/2003/dsa-382
    http://www.debian.org/security/2003/dsa-383
    http://www.kb.cert.org/vuls/id/333628
    http://www.mandriva.com/security/advisories?name=MDKSA-2003:090
    http://www.openssh.com/txt/buffer.adv
    http://www.openwall.com/lists/oss-security/2024/07/01/3
    http://www.redhat.com/support/errata/RHSA-2003-280.html
    https://exchange.xforce.ibmcloud.com/vulnerabilities/13191
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A2719
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A447
    http://lists.grok.org.uk/pipermail/full-disclosure/2003-September/010103.html
    http://lists.grok.org.uk/pipermail/full-disclosure/2003-September/010135.html
    http://lists.grok.org.uk/pipermail/full-disclosure/2003-September/010146.html
    http://marc.info/?l=bugtraq&m=106373247528528&w=2
    http://marc.info/?l=bugtraq&m=106373546332230&w=2
    http://marc.info/?l=bugtraq&m=106374466212309&w=2
    http://marc.info/?l=bugtraq&m=106381396120332&w=2
    http://marc.info/?l=bugtraq&m=106381409220492&w=2
    http://sunsolve.sun.com/search/document.do?assetkey=1-77-1000620.1-1
    http://www.cert.org/advisories/CA-2003-24.html
    http://www.debian.org/security/2003/dsa-382
    http://www.debian.org/security/2003/dsa-383
    http://www.kb.cert.org/vuls/id/333628
    http://www.mandriva.com/security/advisories?name=MDKSA-2003:090
    http://www.openssh.com/txt/buffer.adv
    http://www.openwall.com/lists/oss-security/2024/07/01/3
    http://www.redhat.com/support/errata/RHSA-2003-280.html
    https://exchange.xforce.ibmcloud.com/vulnerabilities/13191
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A2719
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A447

    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