Vulnerability Monitor

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CVE-2013-4207

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.

Security Impact Summary

CVE-2013-4207 is a security vulnerability that . Impacting 2 products from putty, from simon_tatham organizations running these solutions should prioritize assessment and patching.

Historical Context

Documented in 2013, this vulnerability occurred amid the cloud computing expansion era, where traditional network perimeter security models were being reevaluated. Organizations were transitioning from isolated infrastructure to interconnected systems, creating new attack surfaces that vulnerabilities like this could exploit.

Published

2013-08-19T23:55:08.767

Last Modified

2025-04-11T00:51:21.963

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 4.3 (MEDIUM)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

8.6

Impact Score

2.9

Weaknesses

Type: Primary
CWE-119

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	putty	putty	0.45	Yes
Application	putty	putty	0.46	Yes
Application	putty	putty	0.47	Yes
Application	putty	putty	0.48	Yes
Application	putty	putty	0.49	Yes
Application	putty	putty	0.50	Yes
Application	putty	putty	0.51	Yes
Application	putty	putty	0.52	Yes
Application	putty	putty	0.53b	Yes
Application	putty	putty	0.54	Yes
Application	putty	putty	0.55	Yes
Application	putty	putty	0.56	Yes
Application	putty	putty	0.57	Yes
Application	putty	putty	0.58	Yes
Application	putty	putty	0.59	Yes
Application	putty	putty	0.60	Yes
Application	putty	putty	0.61	Yes
Application	putty	putty	2010-06-01	Yes
Application	simon_tatham	putty	≤ 0.62	Yes
Application	simon_tatham	putty	0.53	Yes

References

http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.html ([email protected])
http://secunia.com/advisories/54379 Vendor Advisory ([email protected])
http://secunia.com/advisories/54533 ([email protected])
http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-bignum-division-by-zero.html Vendor Advisory ([email protected])
http://www.debian.org/security/2013/dsa-2736 ([email protected])
http://www.openwall.com/lists/oss-security/2013/08/06/11 ([email protected])
http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.html (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/54379 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/54533 (af854a3a-2127-422b-91ae-364da2661108)
http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-bignum-division-by-zero.html Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.debian.org/security/2013/dsa-2736 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2013/08/06/11 (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For putty's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.