CVE-2021-20230

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Source
https://nvd.nist.gov/vuln/detail/CVE-2021-20230
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-20230.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-20230
Related
Published
2021-02-23T17:15:13Z
Modified
2025-01-15T01:46:58.531505Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Debian:11 / stunnel4

Package

Name
stunnel4
Purl
pkg:deb/debian/stunnel4?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3:5.56+dfsg-8

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:12 / stunnel4

Package

Name
stunnel4
Purl
pkg:deb/debian/stunnel4?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3:5.56+dfsg-8

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:13 / stunnel4

Package

Name
stunnel4
Purl
pkg:deb/debian/stunnel4?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3:5.56+dfsg-8

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Git / github.com/mtrojnar/stunnel

Affected ranges

Type
GIT
Repo
https://github.com/mtrojnar/stunnel
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
ebad9ddc4efb2635f37174c9d800d06206f1edf9
Fixed
ebad9ddc4efb2635f37174c9d800d06206f1edf9

Affected versions

stunnel-1.*

stunnel-1.0
stunnel-1.1
stunnel-1.2
stunnel-1.3
stunnel-1.4
stunnel-1.5
stunnel-1.6

stunnel-2.*

stunnel-2.0
stunnel-2.1

stunnel-3.*

stunnel-3.00
stunnel-3.01
stunnel-3.02
stunnel-3.03
stunnel-3.04
stunnel-3.05
stunnel-3.06
stunnel-3.07
stunnel-3.08
stunnel-3.09
stunnel-3.10
stunnel-3.11
stunnel-3.12
stunnel-3.13
stunnel-3.14
stunnel-3.15
stunnel-3.16
stunnel-3.17
stunnel-3.18
stunnel-3.19
stunnel-3.20
stunnel-3.21
stunnel-3.22

stunnel-4.*

stunnel-4.00
stunnel-4.01
stunnel-4.02
stunnel-4.03
stunnel-4.04
stunnel-4.05
stunnel-4.06
stunnel-4.07
stunnel-4.08
stunnel-4.09
stunnel-4.10
stunnel-4.11
stunnel-4.12
stunnel-4.13
stunnel-4.14
stunnel-4.15
stunnel-4.16
stunnel-4.17
stunnel-4.18
stunnel-4.19
stunnel-4.20
stunnel-4.21
stunnel-4.22
stunnel-4.23
stunnel-4.24
stunnel-4.25
stunnel-4.26
stunnel-4.27
stunnel-4.28
stunnel-4.29
stunnel-4.30
stunnel-4.31
stunnel-4.32
stunnel-4.33
stunnel-4.34
stunnel-4.35
stunnel-4.36
stunnel-4.37
stunnel-4.38
stunnel-4.39
stunnel-4.40
stunnel-4.41
stunnel-4.42
stunnel-4.43
stunnel-4.44
stunnel-4.45
stunnel-4.46
stunnel-4.47
stunnel-4.48
stunnel-4.49
stunnel-4.50
stunnel-4.51
stunnel-4.52
stunnel-4.53
stunnel-4.54
stunnel-4.55
stunnel-4.56
stunnel-4.57

stunnel-5.*

stunnel-5.00
stunnel-5.01
stunnel-5.02
stunnel-5.03
stunnel-5.04
stunnel-5.05
stunnel-5.06
stunnel-5.07
stunnel-5.08
stunnel-5.09
stunnel-5.10
stunnel-5.11
stunnel-5.12
stunnel-5.13
stunnel-5.14
stunnel-5.15
stunnel-5.16
stunnel-5.17
stunnel-5.18
stunnel-5.19
stunnel-5.20
stunnel-5.21
stunnel-5.22
stunnel-5.23
stunnel-5.24
stunnel-5.25
stunnel-5.26
stunnel-5.27
stunnel-5.28
stunnel-5.29
stunnel-5.30
stunnel-5.31
stunnel-5.33
stunnel-5.34
stunnel-5.35
stunnel-5.36
stunnel-5.37
stunnel-5.38
stunnel-5.39
stunnel-5.40
stunnel-5.41
stunnel-5.42
stunnel-5.43
stunnel-5.44
stunnel-5.45
stunnel-5.46
stunnel-5.47
stunnel-5.48
stunnel-5.49
stunnel-5.50
stunnel-5.51
stunnel-5.52
stunnel-5.53
stunnel-5.54
stunnel-5.55
stunnel-5.56