Vulnerabilities > Stunnel

DATE CVE VULNERABILITY TITLE RISK
2021-02-23 CVE-2021-20230 Improper Certificate Validation vulnerability in Stunnel
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.
network
low complexity
stunnel CWE-295
5.0
2015-05-14 CVE-2015-3644 Improper Access Control vulnerability in Stunnel
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.
network
stunnel CWE-284
5.8
2014-03-24 CVE-2014-0016 Insufficient Entropy in PRNG vulnerability in Stunnel
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.
network
stunnel CWE-332
4.3
2013-03-08 CVE-2013-1762 Code Injection vulnerability in Stunnel
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.
network
high complexity
stunnel CWE-94
6.6
2011-08-25 CVE-2011-2940 Improper Restriction of Operations Within the Bounds of A Memory Buffer vulnerability in Stunnel 4.40/4.41
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.
network
stunnel CWE-119
critical
9.3
2008-05-23 CVE-2008-2420 Permissions, Privileges, and Access Controls vulnerability in Stunnel
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.
network
stunnel CWE-264
6.8
2008-05-22 CVE-2008-2400 Permissions, Privileges, and Access Controls vulnerability in Stunnel
Unspecified vulnerability in stunnel before 4.23, when running as a service on Windows, allows local users to gain privileges via unknown attack vectors.
local
low complexity
stunnel CWE-264
7.2
2003-10-20 CVE-2003-0740 Unspecified vulnerability in Stunnel
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.
local
low complexity
stunnel
4.6
2003-05-12 CVE-2002-1563 SIGCHLD Signal Handler vulnerability in Stunnel 4.04
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.
local
high complexity
stunnel
1.2
2003-03-31 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).
network
low complexity
openpkg openssl stunnel
5.0