VULNERABILITY INTELLIGENCE

CVE-2013-4206

CVSS score6.8 NONE
EPSS probability2.48%
CISA KEVNot currently listed
Published2013-08-19
Last modified2026-06-16
CVSS vectorAV:N/AC:M/Au:N/C:P/I:P/A:P

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.

Weakness classification

  • nvd@nist.gov: CWE-119

Primary references