Vulnerability Monitor

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CVE-2015-3644

Stunnel 5.00 through 5.13, when using the redirect option, does not redirect client connections to the expected server after the initial connection, which allows remote attackers to bypass authentication.

Security Impact Summary

CVE-2015-3644 is a security vulnerability that . Impacting 1 product from stunnel organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2015, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2015-05-14T00:59:06.147

Last Modified

2026-06-17T00:26:02.117

Status

Modified

Source

[email protected]

Severity

CVSSv2: 5.8 (MEDIUM)

CVSSv2 Vector

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

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

Exploitability Score

8.6

Impact Score

4.9

Weaknesses

Type: Primary
CWE-284

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	stunnel	stunnel	5.00	Yes
Application	stunnel	stunnel	5.01	Yes
Application	stunnel	stunnel	5.02	Yes
Application	stunnel	stunnel	5.03	Yes
Application	stunnel	stunnel	5.04	Yes
Application	stunnel	stunnel	5.05	Yes
Application	stunnel	stunnel	5.06	Yes
Application	stunnel	stunnel	5.07	Yes
Application	stunnel	stunnel	5.08	Yes
Application	stunnel	stunnel	5.09	Yes
Application	stunnel	stunnel	5.10	Yes
Application	stunnel	stunnel	5.11	Yes
Application	stunnel	stunnel	5.12	Yes
Application	stunnel	stunnel	5.13	Yes

References

http://www.debian.org/security/2015/dsa-3299 ([email protected])
http://www.securityfocus.com/bid/74659 ([email protected])
http://www.securitytracker.com/id/1032324 ([email protected])
https://www.stunnel.org/CVE-2015-3644.html Patch, Vendor Advisory ([email protected])
http://www.debian.org/security/2015/dsa-3299 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/74659 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id/1032324 (af854a3a-2127-422b-91ae-364da2661108)
https://www.stunnel.org/CVE-2015-3644.html Patch, Vendor Advisory (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 stunnel'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.