CVE-2013-4206

MediumCVSS 6.8/10Last modified Jun 16, 2026

Description

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.

Metrics

CVSS 2.0 6.8/10AV:N/AC:M/Au:N/C:P/I:P/A:P

Weakness enumeration

CWE-119

Affected software

No affected versions have been published.

Timeline

Published: Aug 19, 2013
Last modified: Jun 16, 2026
NVD status: Modified

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