DEBIAN-CVE-2021-3618

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Source
https://security-tracker.debian.org/tracker/CVE-2021-3618
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-3618.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2021-3618
Upstream
Published
2022-03-23T20:15:09Z
Modified
2025-09-19T07:31:41.990794Z
Summary
[none]
Details

ALPACA is an application layer protocol content confusion attack, exploiting TLS servers implementing different protocols but using compatible certificates, such as multi-domain or wildcard certificates. A MiTM attacker having access to victim's traffic at the TCP/IP layer can redirect traffic from one subdomain to another, resulting in a valid TLS session. This breaks the authentication of TLS and cross-protocol attacks may be possible where the behavior of one protocol service may compromise the other at the application layer.

References

Affected packages

Debian:11

nginx

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.18.0-6.1+deb11u2

Affected versions

1.*

1.18.0-6.1
1.18.0-6.1+deb11u1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:12

nginx

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.20.2-2

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

sendmail

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
8.16.1-2

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:13

nginx

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.20.2-2

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

sendmail

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
8.16.1-2

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

vsftpd

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.0.5-0.1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:14

nginx

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.20.2-2

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

sendmail

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
8.16.1-2

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

vsftpd

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.0.5-0.1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}