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    CVE-2020-8794

    OpenSMTPD before 6.6.4 allows remote code execution because of an out-of-bounds read in mta_io in mta_session.c for multi-line replies. Although this vulnerability affects the client side of OpenSMTPD, it is possible to attack a server because the server code launches the client code during bounce handling.

    Published:Feb 25, 2020
    Last Modified:Nov 21, 2024
    EPS:Feb 25, 2020
    EPSS Score:0.86794
    CVSS Score:9.8

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Opensmtpd
    Product
    Opensmtpd

    Exploits

    http://packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-Privilege-Escalation.htmlhttp://www.openwall.com/lists/oss-security/2020/02/26/1http://www.openwall.com/lists/oss-security/2021/05/04/7https://www.openwall.com/lists/oss-security/2020/02/24/5http://packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-Privilege-Escalation.htmlhttp://www.openwall.com/lists/oss-security/2020/02/26/1http://www.openwall.com/lists/oss-security/2021/05/04/7https://www.openwall.com/lists/oss-security/2020/02/24/5https://www.exploit-db.com/exploits/48185https://www.exploit-db.com/exploits/48140

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2026-13476 (CVSS 7.3) — IBM Informix Dynamic Server 14.10, 15.0, and 12.10 could allow an unauthenticated user to execute arbitrary co…
    CVE-2026-13367 (CVSS 7.8) — IBM Informix Dynamic Server 14.10, and 15.0 contain a local privilege escalation vulnerability in the oninit s…
    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
    CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…
    CVE-2026-47330 (CVSS 3.3) — Ubuntu Linux 6.8, 7.17 and 7.0 contain AppArmor SAUCE patches which can, under certain circumstances, use an u…

    References

    http://packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-Privilege-Escalation.html
    http://seclists.org/fulldisclosure/2020/Feb/32
    http://www.openwall.com/lists/oss-security/2020/02/26/1
    http://www.openwall.com/lists/oss-security/2020/03/01/1
    http://www.openwall.com/lists/oss-security/2020/03/01/2
    http://www.openwall.com/lists/oss-security/2021/05/04/7
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/
    https://usn.ubuntu.com/4294-1/
    https://www.debian.org/security/2020/dsa-4634
    https://www.openbsd.org/security.html
    https://www.openwall.com/lists/oss-security/2020/02/24/5
    http://packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-Privilege-Escalation.html
    http://seclists.org/fulldisclosure/2020/Feb/32
    http://www.openwall.com/lists/oss-security/2020/02/26/1
    http://www.openwall.com/lists/oss-security/2020/03/01/1
    http://www.openwall.com/lists/oss-security/2020/03/01/2
    http://www.openwall.com/lists/oss-security/2021/05/04/7
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/
    https://usn.ubuntu.com/4294-1/
    https://www.debian.org/security/2020/dsa-4634
    https://www.openbsd.org/security.html
    https://www.openwall.com/lists/oss-security/2020/02/24/5

    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