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  • CPE Product Version: cpe:/a:stunnel:stunnel:3.11
There are 8 matching records.
Displaying matches 1 through 8.
Vuln ID Summary CVSS Severity
CVE-2021-20230

A flaw was found in stunnel before 5.57, where it improperly validates client certificates when it is configured to use both redirect and verifyChain options. This flaw allows an attacker with a certificate signed by a Certificate Authority, which is not the one accepted by the stunnel server, to access the tunneled service instead of being redirected to the address specified in the redirect option. The highest threat from this vulnerability is to confidentiality.

Published: February 23, 2021; 12:15:13 PM -0500
V3.1: 7.5 HIGH
V2.0: 5.0 MEDIUM
CVE-2014-0016

stunnel before 5.00, when using fork threading, does not properly update the state of the OpenSSL pseudo-random number generator (PRNG), which causes subsequent children with the same process ID to use the same entropy pool and allows remote attackers to obtain private keys for EC (ECDSA) or DSA certificates.

Published: March 24, 2014; 12:31:08 PM -0400
V3.x:(not available)
V2.0: 4.3 MEDIUM
CVE-2013-1762

stunnel 4.21 through 4.54, when CONNECT protocol negotiation and NTLM authentication are enabled, does not correctly perform integer conversion, which allows remote proxy servers to execute arbitrary code via a crafted request that triggers a buffer overflow.

Published: March 08, 2013; 1:55:01 PM -0500
V3.x:(not available)
V2.0: 6.6 MEDIUM
CVE-2008-2420

The OCSP functionality in stunnel before 4.24 does not properly search certificate revocation lists (CRL), which allows remote attackers to bypass intended access restrictions by using revoked certificates.

Published: May 23, 2008; 11:32:00 AM -0400
V3.x:(not available)
V2.0: 6.8 MEDIUM
CVE-2008-2400

Unspecified vulnerability in stunnel before 4.23, when running as a service on Windows, allows local users to gain privileges via unknown attack vectors.

Published: May 22, 2008; 9:09:00 AM -0400
V3.x:(not available)
V2.0: 7.2 HIGH
CVE-2003-0740

Stunnel 4.00, and 3.24 and earlier, leaks a privileged file descriptor returned by listen(), which allows local users to hijack the Stunnel server.

Published: October 20, 2003; 12:00:00 AM -0400
V3.x:(not available)
V2.0: 4.6 MEDIUM
CVE-2003-0147

OpenSSL does not use RSA blinding by default, which allows local and remote attackers to obtain the server's private key by determining factors using timing differences on (1) the number of extra reductions during Montgomery reduction, and (2) the use of different integer multiplication algorithms ("Karatsuba" and normal).

Published: March 31, 2003; 12:00:00 AM -0500
V3.x:(not available)
V2.0: 5.0 MEDIUM
CVE-2002-0002

Format string vulnerability in stunnel before 3.22 when used in client mode for (1) smtp, (2) pop, or (3) nntp allows remote malicious servers to execute arbitrary code.

Published: January 31, 2002; 12:00:00 AM -0500
V3.x:(not available)
V2.0: 7.5 HIGH