CVE-2015-5309

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    CVE-2015-5309

    Published: 7 Dec 2015Last Modified: 16 Apr 2026

    Summary:

    Details: Integer overflow in the terminal emulator in PuTTY before 0.66 allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via an ECH (erase characters) escape sequence with a large parameter value, which triggers a buffer underflow.

    References: http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-ech-overflow.html, http://www.debian.org/security/2015/dsa-3409, https://security.gentoo.org/glsa/201606-01, http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173021.html, http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173094.html, http://lists.opensuse.org/opensuse-updates/2015-11/msg00099.html, http://www.securitytracker.com/id/1034308

    Affected packages

    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