CVE-2021-3618

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.

Affected products

Alt Linux, Astra Linux, Debian, Linuxmint, Nginx, Red Os, Sendmail, Suse

f5 Nginx

< 1.21.0

CVSS 3.1

7.4 HIGH

EPSS

2.0% (79th percentile)

Weakness

CWE-295

NVD status

Modified

Published

2022-03-23