CVE-2013-4207: n/a vulnerability

CVE-2013-4207: Buffer overflow in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cause a denial of service (cra...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 16:38 UTC (UTC+00:00)

Security readout for executives and security teams

PuTTY clients older than 0.63 can be crashed by a hostile SSH server using a malformed DSA signature. The documented impact is denial of service, not data theft or code execution. Risk is mainly legacy-client exposure and users connecting to untrusted or compromised SSH servers. Exposure is limited to PuTTY versions before 0.63, including downstream operating-system packages, when they connect to a malicious or compromised SSH server. The bundle does not identify broader products beyond PuTTY packaging advisories. Treat this as a legacy hygiene issue unless old PuTTY clients remain in use. It can disrupt SSH administration sessions, but the provided evidence supports denial of service only and no known active exploitation. Mitigation focus: Upgrade PuTTY to version 0.63 or later.; Apply relevant Debian, openSUSE, or other vendor package updates.; Remove unsupported legacy PuTTY builds from managed endpoints..

Prepared: Jun 14, 2026, 21:50 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Aug 19, 2013, 23:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

0Timeline events

0ADP providers

1Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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