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.
| Reporter | Title | Published | Views | Family All 68 |
|---|---|---|---|---|
 | CVE-2021-20230 | 23 Feb 202117:15 | – | attackerkb |
 | Alibaba Cloud Linux 3 : 0011: stunnel (ALINUX3-SA-2021:0011) | 14 May 202500:00 | – | nessus |
| AlmaLinux 8 : stunnel (ALSA-2021:0618) | 9 Feb 202200:00 | – | nessus |
| CentOS 8 : stunnel (CESA-2021:0618) | 27 Feb 202100:00 | – | nessus |
| EulerOS 2.0 SP8 : stunnel (EulerOS-SA-2021-1889) | 18 May 202100:00 | – | nessus |
| GLSA-202105-02 : stunnel: Improper certificate validation | 27 May 202100:00 | – | nessus |
| MiracleLinux 8 : stunnel-5.56-5.el8 (AXSA:2021-1521:02) | 20 Jan 202600:00 | – | nessus |
| NewStart CGSL MAIN 6.02 : stunnel Vulnerability (NS-SA-2021-0123) | 27 Oct 202100:00 | – | nessus |
| openSUSE Security Update : stunnel (openSUSE-2021-409) | 15 Mar 202100:00 | – | nessus |
| Oracle Linux 8 : stunnel (ELSA-2021-0618) | 14 Apr 202100:00 | – | nessus |
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19 Jan 2022 08:00Current
7High risk
Vulners AI Score7
CVSS 25
CVSS 3.17.5
EPSS0.01179