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    CVE-2013-4206

    Heap-based buffer underflow in the modmul function in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cause a denial of service (crash) and possibly trigger memory corruption or code execution via a crafted DSA signature, which is not properly handled when performing certain bit-shifting operations during modular multiplication.

    Published:Aug 19, 2013
    Last Modified:Apr 11, 2025
    EPS:Aug 19, 2013
    EPSS Score:0.01136
    CVSS Score:6.8

    Affected Products

    Vendor
    Putty
    Product
    Putty
    Vendor
    Simon Tatham
    Product
    Putty

    Exploits

    No exploit reference

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    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