DEBIAN-CVE-2021-3618
- Source
- https://security-tracker.debian.org/tracker/CVE-2021-3618
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-3618.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2021-3618
- Upstream
- Downstream
- Published
- 2022-03-23T20:15:09Z
- Modified
- 2026-09-01T20:04:31Z
- Severity
-
- 7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
- 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:12
nginx
Package
- Name
- nginx
- Purl
- pkg:deb/debian/nginx?arch=source&distro=bookworm
sendmail
Package
- Name
- sendmail
- Purl
- pkg:deb/debian/sendmail?arch=source&distro=bookworm
vsftpd
Package
- Name
- vsftpd
- Purl
- pkg:deb/debian/vsftpd?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Debian:13
nginx
Package
- Name
- nginx
- Purl
- pkg:deb/debian/nginx?arch=source&distro=trixie
sendmail
Package
- Name
- sendmail
- Purl
- pkg:deb/debian/sendmail?arch=source&distro=trixie
vsftpd
Package
- Name
- vsftpd
- Purl
- pkg:deb/debian/vsftpd?arch=source&distro=trixie
Debian:14
nginx
Package
- Name
- nginx
- Purl
- pkg:deb/debian/nginx?arch=source&distro=forky
sendmail
Package
- Name
- sendmail
- Purl
- pkg:deb/debian/sendmail?arch=source&distro=forky
vsftpd
Package
- Name
- vsftpd
- Purl
- pkg:deb/debian/vsftpd?arch=source&distro=forky