CVE-2021-3618

2022-03-2300:00:00

CWE-295

redhat

www.cve.org

7.8 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

46.9%

JSON

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.

CNA Affected

[
  {
    "vendor": "n/a",
    "product": "ALPACA",
    "versions": [
      {
        "version": "vsftpd 3.0.4, nginx 1.21.0, sendmail 8.17",
        "status": "affected"
      }
    ]
  }
]