Is CVE-2013-4206 actively exploited?

CVE-2013-4206 has no public evidence of in-the-wild exploitation as of 2026-04-29.

What is the CVSS score for CVE-2013-4206?

CVE-2013-4206 has a CVSS score of 6.8 (UNKNOWN severity). Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P.

How do I patch CVE-2013-4206?

Patch guidance is available from putty security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2013-4206.

CVE-2013-4206 - remediation guidance & executive summary

Q: Which products are affected by CVE-2013-4206?

20 products: putty putty, putty putty, putty putty, putty putty, putty putty, and 15 more.

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.

CVSS Metrics

Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P
Access Vector: network
Access Cmplx: medium
Auth: none
Confidentiality: partial
Integrity: partial
Availability: partial
Weaknesses: CWE-119 · Memory Buffer Errors

Metadata

Primary Vendor: PUTTY
Published: 8/19/2013
Last Modified: 4/29/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

putty : puttyputty : puttyputty : puttyputty : puttyputty : puttyputty : puttyputty : puttyputty : puttyputty : puttyputty : puttyputty : puttyputty : puttyputty : puttyputty : puttyputty : puttyputty : puttyputty : puttyputty : puttysimon_tatham : puttysimon_tatham : putty

Remediation Guidance

Executive Summary

Cite this page

CVE-2013-4206. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2013-4206

View on NIST NVD

CVE-2013-4206 vulnerability