Is CVE-2013-4207 actively exploited?

CVE-2013-4207 has no public evidence of in-the-wild exploitation as of 2026-04-29.

What is the CVSS score for CVE-2013-4207?

CVE-2013-4207 has a CVSS score of 4.3 (UNKNOWN severity). Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P.

How do I patch CVE-2013-4207?

Patch guidance is available from putty security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2013-4207.

CVE-2013-4207 - remediation guidance & executive summary

Q: Which products are affected by CVE-2013-4207?

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

Description

Buffer overflow in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cause a denial of service (crash) via an invalid DSA signature that is not properly handled during computation of a modular inverse and triggers the overflow during a division by zero by the bignum functionality, a different vulnerability than CVE-2013-4206.

CVSS Metrics

Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P
Access Vector: network
Access Cmplx: medium
Auth: none
Confidentiality: none
Integrity: none
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

View on NIST NVD