Stunnel

stunnel

Vendor: Stunnel • 12 CVEs

CVEs (12)

CVE VENDORS PRODUCTS UPDATED PUBLISHED CVSS
CVE-2021-20230 1Stunnel 1Stunnel Nov 21, 2024 Feb 23, 2021 N/A· v4 7.5 HIGH· v3 5.0 MEDIUM· v2 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 C...Show more 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.Show less
CVE-2015-3644 1Stunnel 1Stunnel May 6, 2026 May 14, 2015 N/A· v4 N/A· v3 5.8 MEDIUM· v2 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.
CVE-2014-0016 1Stunnel 1Stunnel May 6, 2026 Mar 24, 2014 N/A· v4 N/A· v3 4.3 MEDIUM· v2 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 p...Show more 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.Show less
CVE-2013-1762 1Stunnel 1Stunnel Apr 29, 2026 Mar 8, 2013 N/A· v4 N/A· v3 6.6 MEDIUM· v2 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 r...Show more 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.Show less
CVE-2011-2940 1Stunnel 1Stunnel Apr 29, 2026 Aug 25, 2011 N/A· v4 N/A· v3 9.3 HIGH· v2 stunnel 4.40 and 4.41 might allow remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.
CVE-2008-2420 1Stunnel 1Stunnel Apr 23, 2026 May 23, 2008 N/A· v4 N/A· v3 6.8 MEDIUM· v2 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.
CVE-2008-2400 1Stunnel 1Stunnel Apr 23, 2026 May 22, 2008 N/A· v4 N/A· v3 7.2 HIGH· v2 Unspecified vulnerability in stunnel before 4.23, when running as a service on Windows, allows local users to gain privileges via unknown attack vectors.
CVE-2003-0740 1Stunnel 1Stunnel Apr 16, 2026 Oct 20, 2003 N/A· v4 N/A· v3 4.6 MEDIUM· v2 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.
CVE-2002-1563 1Stunnel 1Stunnel Apr 16, 2026 May 12, 2003 N/A· v4 N/A· v3 1.2 LOW· v2 stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.
CVE-2003-0147 3Openpkg OpensslStunnel 3Openpkg OpensslStunnel Apr 16, 2026 Mar 31, 2003 N/A· v4 N/A· v3 5.0 MEDIUM· v2 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 Montgo...Show more 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).Show less
CVE-2002-0002 4Engardelinux MandrakesoftRedhat+1 more 4Linux Mandrake LinuxSecure Linux+1 more Apr 16, 2026 Jan 31, 2002 N/A· v4 N/A· v3 7.5 HIGH· v2 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.
CVE-2001-0060 1Stunnel 1Stunnel Apr 16, 2026 Feb 12, 2001 N/A· v4 N/A· v3 10.0 HIGH· v2 Format string vulnerability in stunnel 3.8 and earlier allows attackers to execute arbitrary commands via a malformed ident username.