Vulnerabilities > CVE-2021-3618

CVSS 7.4 - HIGH

Attack vector

NETWORK

Attack complexity

HIGH

Privileges required

NONE

Confidentiality impact

HIGH

Integrity impact

HIGH

Availability impact

NONE

network

high complexity

NVD

Published: 2022-03-23

Updated: 2024-11-21

Summary

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.

Vulnerable Configurations

Part	Description	Count
Application	F5 F5 Nginx - F5 Nginx 0.1.0 F5 Nginx 0.1.1 F5 Nginx 0.1.2 F5 Nginx 0.1.3 F5 Nginx 0.1.4 F5 Nginx 0.1.5 F5 Nginx 0.1.6 F5 Nginx 0.1.7 F5 Nginx 0.1.8 F5 Nginx 0.1.9 F5 Nginx 0.1.10 F5 Nginx 0.1.11 F5 Nginx 0.1.12 F5 Nginx 0.1.13 F5 Nginx 0.1.14 F5 Nginx 0.1.15 F5 Nginx 0.1.16 F5 Nginx 0.1.17 F5 Nginx 0.1.18 F5 Nginx 0.1.19 F5 Nginx 0.1.20 F5 Nginx 0.1.21 F5 Nginx 0.1.22 F5 Nginx 0.1.23 F5 Nginx 0.1.24 F5 Nginx 0.1.25 F5 Nginx 0.1.26 F5 Nginx 0.1.27 F5 Nginx 0.1.28 F5 Nginx 0.1.29 F5 Nginx 0.1.30 F5 Nginx 0.1.31 F5 Nginx 0.1.32 F5 Nginx 0.1.33 F5 Nginx 0.1.34 F5 Nginx 0.1.35 F5 Nginx 0.1.36 F5 Nginx 0.1.37 F5 Nginx 0.1.38 F5 Nginx 0.1.39 F5 Nginx 0.1.40 F5 Nginx 0.1.41 F5 Nginx 0.1.42 F5 Nginx 0.1.43 F5 Nginx 0.1.44 F5 Nginx 0.1.45 F5 Nginx 0.2.0 F5 Nginx 0.2.1 F5 Nginx 0.2.2 F5 Nginx 0.2.3 F5 Nginx 0.2.4 F5 Nginx 0.2.5 F5 Nginx 0.2.6 F5 Nginx 0.3.0 F5 Nginx 0.3.1 F5 Nginx 0.3.2 F5 Nginx 0.3.3 F5 Nginx 0.3.4 F5 Nginx 0.3.5 F5 Nginx 0.3.6 F5 Nginx 0.3.7 F5 Nginx 0.3.8 F5 Nginx 0.3.9 F5 Nginx 0.3.10 F5 Nginx 0.3.11 F5 Nginx 0.3.12 F5 Nginx 0.3.13 F5 Nginx 0.3.14 F5 Nginx 0.3.15 F5 Nginx 0.3.16 F5 Nginx 0.3.17 F5 Nginx 0.3.18 F5 Nginx 0.3.19 F5 Nginx 0.3.20 F5 Nginx 0.3.21 F5 Nginx 0.3.22 F5 Nginx 0.3.23 F5 Nginx 0.3.24 F5 Nginx 0.3.25 F5 Nginx 0.3.26 F5 Nginx 0.3.27 F5 Nginx 0.3.28 F5 Nginx 0.3.29 F5 Nginx 0.3.30 F5 Nginx 0.3.31 F5 Nginx 0.3.32 F5 Nginx 0.3.33 F5 Nginx 0.3.34 F5 Nginx 0.3.35 F5 Nginx 0.3.36 F5 Nginx 0.3.37 F5 Nginx 0.3.38 F5 Nginx 0.3.39 F5 Nginx 0.3.40 F5 Nginx 0.3.41 F5 Nginx 0.3.42 F5 Nginx 0.3.43 F5 Nginx 0.3.44 F5 Nginx 0.3.45 F5 Nginx 0.3.46 F5 Nginx 0.3.47 F5 Nginx 0.3.48 F5 Nginx 0.3.49 F5 Nginx 0.3.50 F5 Nginx 0.3.51 F5 Nginx 0.3.52 F5 Nginx 0.3.53 F5 Nginx 0.3.54 F5 Nginx 0.3.55 F5 Nginx 0.3.56 F5 Nginx 0.3.57 F5 Nginx 0.3.58 F5 Nginx 0.3.59 F5 Nginx 0.3.60 F5 Nginx 0.3.61 F5 Nginx 0.4.0 F5 Nginx 0.4.1 F5 Nginx 0.4.2 F5 Nginx 0.4.3 F5 Nginx 0.4.4 F5 Nginx 0.4.5 F5 Nginx 0.4.6 F5 Nginx 0.4.7 F5 Nginx 0.4.8 F5 Nginx 0.4.9 F5 Nginx 0.4.10 F5 Nginx 0.4.11 F5 Nginx 0.4.12 F5 Nginx 0.4.13 F5 Nginx 0.4.14 F5 Nginx 0.5.0 F5 Nginx 0.5.1 F5 Nginx 0.5.2 F5 Nginx 0.5.3 F5 Nginx 0.5.4 F5 Nginx 0.5.5 F5 Nginx 0.5.6 F5 Nginx 0.5.7 F5 Nginx 0.5.8 F5 Nginx 0.5.9 F5 Nginx 0.5.10 F5 Nginx 0.5.11 F5 Nginx 0.5.12 F5 Nginx 0.5.13 F5 Nginx 0.5.14 F5 Nginx 0.5.15 F5 Nginx 0.5.16 F5 Nginx 0.5.17 F5 Nginx 0.5.18 F5 Nginx 0.5.19 F5 Nginx 0.5.20 F5 Nginx 0.5.21 F5 Nginx 0.5.22 F5 Nginx 0.5.23 F5 Nginx 0.5.24 F5 Nginx 0.5.25 F5 Nginx 0.5.26 F5 Nginx 0.5.27 F5 Nginx 0.5.28 F5 Nginx 0.5.29 F5 Nginx 0.5.30 F5 Nginx 0.5.31 F5 Nginx 0.5.32 F5 Nginx 0.5.33 F5 Nginx 0.5.34 F5 Nginx 0.5.35 F5 Nginx 0.5.36 F5 Nginx 0.5.37 F5 Nginx 0.5.38 F5 Nginx 0.6.0 F5 Nginx 0.6.1 F5 Nginx 0.6.2 F5 Nginx 0.6.3 F5 Nginx 0.6.4 F5 Nginx 0.6.5 F5 Nginx 0.6.6 F5 Nginx 0.6.7 F5 Nginx 0.6.8 F5 Nginx 0.6.9 F5 Nginx 0.6.10 F5 Nginx 0.6.11 F5 Nginx 0.6.12 F5 Nginx 0.6.13 F5 Nginx 0.6.14 F5 Nginx 0.6.15 F5 Nginx 0.6.16 F5 Nginx 0.6.17 F5 Nginx 0.6.18 F5 Nginx 0.6.19 F5 Nginx 0.6.20 F5 Nginx 0.6.21 F5 Nginx 0.6.22 F5 Nginx 0.6.23 F5 Nginx 0.6.24 F5 Nginx 0.6.25 F5 Nginx 0.6.26 F5 Nginx 0.6.27 F5 Nginx 0.6.28 F5 Nginx 0.6.29 F5 Nginx 0.6.30 F5 Nginx 0.6.31 F5 Nginx 0.6.32 F5 Nginx 0.6.33 F5 Nginx 0.6.34 F5 Nginx 0.6.35 F5 Nginx 0.6.36 F5 Nginx 0.6.37 F5 Nginx 0.6.38 F5 Nginx 0.6.39 F5 Nginx 0.7.0 F5 Nginx 0.7.1 F5 Nginx 0.7.2 F5 Nginx 0.7.3 F5 Nginx 0.7.4 F5 Nginx 0.7.5 F5 Nginx 0.7.6 F5 Nginx 0.7.7 F5 Nginx 0.7.8 F5 Nginx 0.7.9 F5 Nginx 0.7.10 F5 Nginx 0.7.11 F5 Nginx 0.7.12 F5 Nginx 0.7.13 F5 Nginx 0.7.14 F5 Nginx 0.7.15 F5 Nginx 0.7.16 F5 Nginx 0.7.17 F5 Nginx 0.7.18 F5 Nginx 0.7.19 F5 Nginx 0.7.20 F5 Nginx 0.7.21 F5 Nginx 0.7.22 F5 Nginx 0.7.23 F5 Nginx 0.7.24 F5 Nginx 0.7.25 F5 Nginx 0.7.26 F5 Nginx 0.7.27 F5 Nginx 0.7.28 F5 Nginx 0.7.29 F5 Nginx 0.7.30 F5 Nginx 0.7.31 F5 Nginx 0.7.32 F5 Nginx 0.7.33 F5 Nginx 0.7.34 F5 Nginx 0.7.35 F5 Nginx 0.7.36 F5 Nginx 0.7.37 F5 Nginx 0.7.38 F5 Nginx 0.7.39 F5 Nginx 0.7.40 F5 Nginx 0.7.41 F5 Nginx 0.7.42 F5 Nginx 0.7.43 F5 Nginx 0.7.44 F5 Nginx 0.7.45 F5 Nginx 0.7.46 F5 Nginx 0.7.47 F5 Nginx 0.7.48 F5 Nginx 0.7.49 F5 Nginx 0.7.50 F5 Nginx 0.7.51 F5 Nginx 0.7.52 F5 Nginx 0.7.53 F5 Nginx 0.7.54 F5 Nginx 0.7.55 F5 Nginx 0.7.56 F5 Nginx 0.7.57 F5 Nginx 0.7.58 F5 Nginx 0.7.59 F5 Nginx 0.7.60 F5 Nginx 0.7.61 F5 Nginx 0.7.62 F5 Nginx 0.7.63 F5 Nginx 0.7.64 F5 Nginx 0.7.65 F5 Nginx 0.7.66 F5 Nginx 0.7.67 F5 Nginx 0.7.68 F5 Nginx 0.7.69 F5 Nginx 0.8.0 F5 Nginx 0.8.1 F5 Nginx 0.8.2 F5 Nginx 0.8.3 F5 Nginx 0.8.4 F5 Nginx 0.8.5 F5 Nginx 0.8.6 F5 Nginx 0.8.7 F5 Nginx 0.8.8 F5 Nginx 0.8.9 F5 Nginx 0.8.10 F5 Nginx 0.8.11 F5 Nginx 0.8.12 F5 Nginx 0.8.13 F5 Nginx 0.8.14 F5 Nginx 0.8.15 F5 Nginx 0.8.16 F5 Nginx 0.8.17 F5 Nginx 0.8.18 F5 Nginx 0.8.19 F5 Nginx 0.8.20 F5 Nginx 0.8.21 F5 Nginx 0.8.22 F5 Nginx 0.8.23 F5 Nginx 0.8.24 F5 Nginx 0.8.25 F5 Nginx 0.8.26 F5 Nginx 0.8.27 F5 Nginx 0.8.28 F5 Nginx 0.8.29 F5 Nginx 0.8.30 F5 Nginx 0.8.31 F5 Nginx 0.8.32 F5 Nginx 0.8.33 F5 Nginx 0.8.34 F5 Nginx 0.8.35 F5 Nginx 0.8.36 F5 Nginx 0.8.37 F5 Nginx 0.8.38 F5 Nginx 0.8.39 F5 Nginx 0.8.40 F5 Nginx 0.8.41 F5 Nginx 0.8.42 F5 Nginx 0.8.43 F5 Nginx 0.8.44 F5 Nginx 0.8.45 F5 Nginx 0.8.46 F5 Nginx 0.8.47 F5 Nginx 0.8.48 F5 Nginx 0.8.49 F5 Nginx 0.8.50 F5 Nginx 0.8.51 F5 Nginx 0.8.52 F5 Nginx 0.8.53 F5 Nginx 0.8.54 F5 Nginx 0.8.55 F5 Nginx 0.9.0 F5 Nginx 0.9.1 F5 Nginx 0.9.2 F5 Nginx 0.9.3 F5 Nginx 0.9.4 F5 Nginx 0.9.5 F5 Nginx 0.9.6 F5 Nginx 0.9.7 F5 Nginx 1.0.0 F5 Nginx 1.0.1 F5 Nginx 1.0.2 F5 Nginx 1.0.3 F5 Nginx 1.0.4 F5 Nginx 1.0.5 F5 Nginx 1.0.6 F5 Nginx 1.0.7 F5 Nginx 1.0.8 F5 Nginx 1.0.9 F5 Nginx 1.0.10 F5 Nginx 1.0.11 F5 Nginx 1.0.12 F5 Nginx 1.0.13 F5 Nginx 1.0.14 F5 Nginx 1.0.15 F5 Nginx 1.1.0 F5 Nginx 1.1.1 F5 Nginx 1.1.2 F5 Nginx 1.1.3 F5 Nginx 1.1.4 F5 Nginx 1.1.5 F5 Nginx 1.1.6 F5 Nginx 1.1.7 F5 Nginx 1.1.8 F5 Nginx 1.1.9 F5 Nginx 1.1.10 F5 Nginx 1.1.11 F5 Nginx 1.1.12 F5 Nginx 1.1.13 F5 Nginx 1.1.14 F5 Nginx 1.1.15 F5 Nginx 1.1.16 F5 Nginx 1.1.17 F5 Nginx 1.1.18 F5 Nginx 1.1.19 F5 Nginx 1.2.0 F5 Nginx 1.2.1 F5 Nginx 1.2.2 F5 Nginx 1.2.3 F5 Nginx 1.2.4 F5 Nginx 1.2.5 F5 Nginx 1.2.6 F5 Nginx 1.2.7 F5 Nginx 1.2.8 F5 Nginx 1.2.9 F5 Nginx 1.3.0 F5 Nginx 1.3.1 F5 Nginx 1.3.2 F5 Nginx 1.3.3 F5 Nginx 1.3.4 F5 Nginx 1.3.5 F5 Nginx 1.3.6 F5 Nginx 1.3.7 F5 Nginx 1.3.8 F5 Nginx 1.3.9 F5 Nginx 1.3.10 F5 Nginx 1.3.11 F5 Nginx 1.3.12 F5 Nginx 1.3.13 F5 Nginx 1.3.14 F5 Nginx 1.3.15 F5 Nginx 1.3.16 F5 Nginx 1.4.0 F5 Nginx 1.4.1 F5 Nginx 1.4.2 F5 Nginx 1.4.3 F5 Nginx 1.4.4 F5 Nginx 1.4.5 F5 Nginx 1.4.6 F5 Nginx 1.4.7 F5 Nginx 1.5.0 F5 Nginx 1.5.1 F5 Nginx 1.5.2 F5 Nginx 1.5.3 F5 Nginx 1.5.4 F5 Nginx 1.5.5 F5 Nginx 1.5.6 F5 Nginx 1.5.7 F5 Nginx 1.5.8 F5 Nginx 1.5.9 F5 Nginx 1.5.10 F5 Nginx 1.5.11 F5 Nginx 1.5.12 F5 Nginx 1.5.13 F5 Nginx 1.6.0 F5 Nginx 1.6.1 F5 Nginx 1.6.2 F5 Nginx 1.6.3 F5 Nginx 1.7.0 F5 Nginx 1.7.4 F5 Nginx 1.7.5 F5 Nginx 1.7.6 F5 Nginx 1.7.7 F5 Nginx 1.7.8 F5 Nginx 1.7.9 F5 Nginx 1.7.10 F5 Nginx 1.7.11 F5 Nginx 1.7.12 F5 Nginx 1.8.0 F5 Nginx 1.8.1 F5 Nginx 1.9.0 F5 Nginx 1.9.1 F5 Nginx 1.9.2 F5 Nginx 1.9.3 F5 Nginx 1.9.4 F5 Nginx 1.9.5 F5 Nginx 1.9.6 F5 Nginx 1.9.7 F5 Nginx 1.9.8 F5 Nginx 1.9.9 F5 Nginx 1.9.10 F5 Nginx 1.9.11 F5 Nginx 1.9.12 F5 Nginx 1.9.13 F5 Nginx 1.9.14 F5 Nginx 1.9.15 F5 Nginx 1.10.0 F5 Nginx 1.10.1 F5 Nginx 1.10.2 F5 Nginx 1.10.3 F5 Nginx 1.11.0 F5 Nginx 1.11.1 F5 Nginx 1.11.2 F5 Nginx 1.11.3 F5 Nginx 1.11.4 F5 Nginx 1.11.5 F5 Nginx 1.11.6 F5 Nginx 1.11.7 F5 Nginx 1.11.8 F5 Nginx 1.11.9 F5 Nginx 1.11.10 F5 Nginx 1.11.11 F5 Nginx 1.11.12 F5 Nginx 1.11.13 F5 Nginx 1.12.0 F5 Nginx 1.12.1 F5 Nginx 1.12.2 F5 Nginx 1.13.0 F5 Nginx 1.13.1 F5 Nginx 1.13.2 F5 Nginx 1.13.3 F5 Nginx 1.13.4 F5 Nginx 1.13.5 F5 Nginx 1.13.6 F5 Nginx 1.13.7 F5 Nginx 1.13.8 F5 Nginx 1.13.9 F5 Nginx 1.13.10 F5 Nginx 1.13.11 F5 Nginx 1.13.12 F5 Nginx 1.14.0 F5 Nginx 1.14.1 F5 Nginx 1.14.2 F5 Nginx 1.15.0 F5 Nginx 1.15.1 F5 Nginx 1.15.2 F5 Nginx 1.15.3 F5 Nginx 1.15.4 F5 Nginx 1.15.5 F5 Nginx 1.15.6 F5 Nginx 1.15.7 F5 Nginx 1.15.8 F5 Nginx 1.15.9 F5 Nginx 1.15.10 F5 Nginx 1.15.11 F5 Nginx 1.15.12 F5 Nginx 1.16.0 F5 Nginx 1.16.1 F5 Nginx 1.17.0 F5 Nginx 1.17.1 F5 Nginx 1.17.2 F5 Nginx 1.17.3 F5 Nginx 1.17.4 F5 Nginx 1.17.5 F5 Nginx 1.17.6 F5 Nginx 1.17.7 F5 Nginx 1.17.8 F5 Nginx 1.17.9 F5 Nginx 1.17.10 F5 Nginx 1.18.0 F5 Nginx 1.19.0 F5 Nginx 1.19.1 F5 Nginx 1.19.2 F5 Nginx 1.19.3 F5 Nginx 1.19.4 F5 Nginx 1.19.5 F5 Nginx 1.19.6 F5 Nginx 1.19.7 F5 Nginx 1.19.8 F5 Nginx 1.19.9 F5 Nginx 1.19.10 F5 Nginx 1.20.0 F5 Nginx 1.20.1 F5 Nginx 1.20.2	539
Application	Sendmail Sendmail Sendmail - Sendmail Sendmail 2.6 Sendmail Sendmail 2.6.1 Sendmail Sendmail 2.6.2 Sendmail Sendmail 3.0 Sendmail Sendmail 3.0.1 Sendmail Sendmail 3.0.2 Sendmail Sendmail 3.0.3 Sendmail Sendmail 4.1 Sendmail Sendmail 8.6.7 Sendmail Sendmail 8.7.6 Sendmail Sendmail 8.7.7 Sendmail Sendmail 8.7.8 Sendmail Sendmail 8.7.9 Sendmail Sendmail 8.7.10 Sendmail Sendmail 8.8.8 Sendmail Sendmail 8.9.0 Sendmail Sendmail 8.9.1 Sendmail Sendmail 8.9.2 Sendmail Sendmail 8.9.3 Sendmail Sendmail 8.10 Sendmail Sendmail 8.10.0 Sendmail Sendmail 8.10.1 Sendmail Sendmail 8.10.2 Sendmail Sendmail 8.11.0 Sendmail Sendmail 8.11.1 Sendmail Sendmail 8.11.2 Sendmail Sendmail 8.11.3 Sendmail Sendmail 8.11.4 Sendmail Sendmail 8.11.5 Sendmail Sendmail 8.11.6 Sendmail Sendmail 8.11.7 Sendmail Sendmail 8.12 Sendmail Sendmail 8.12.0 Sendmail Sendmail 8.12.1 Sendmail Sendmail 8.12.2 Sendmail Sendmail 8.12.3 Sendmail Sendmail 8.12.4 Sendmail Sendmail 8.12.5 Sendmail Sendmail 8.12.6 Sendmail Sendmail 8.12.7 Sendmail Sendmail 8.12.8 Sendmail Sendmail 8.12.9 Sendmail Sendmail 8.12.10 Sendmail Sendmail 8.12.11 Sendmail Sendmail 8.13.0 Sendmail Sendmail 8.13.1 Sendmail Sendmail 8.13.1.2 Sendmail Sendmail 8.13.2 Sendmail Sendmail 8.13.3 Sendmail Sendmail 8.13.4 Sendmail Sendmail 8.13.5 Sendmail Sendmail 8.13.6 Sendmail Sendmail 8.13.7 Sendmail Sendmail 8.13.8 Sendmail Sendmail 8.14.0 Sendmail Sendmail 8.14.1 Sendmail Sendmail 8.14.2 Sendmail Sendmail 8.14.3 Sendmail Sendmail 8.14.4 Sendmail Sendmail 8.14.5 Sendmail Sendmail 8.14.6 Sendmail Sendmail 8.14.7 Sendmail Sendmail 8.14.8 Sendmail Sendmail 8.14.9 Sendmail Sendmail 8.15.4	70
Application	Vsftpd_Project Vsftpd Project Vsftpd 0.9.2 Vsftpd Project Vsftpd 1.1.0 Vsftpd Project Vsftpd 1.1.1 Vsftpd Project Vsftpd 1.1.2 Vsftpd Project Vsftpd 1.1.3 Vsftpd Project Vsftpd 1.2.0 Vsftpd Project Vsftpd 1.2.1 Vsftpd Project Vsftpd 1.2.2 Vsftpd Project Vsftpd 2.0.0 Vsftpd Project Vsftpd 2.0.1 Vsftpd Project Vsftpd 2.0.2 Vsftpd Project Vsftpd 2.0.3 Vsftpd Project Vsftpd 2.0.4 Vsftpd Project Vsftpd 2.0.5 Vsftpd Project Vsftpd 2.0.6 Vsftpd Project Vsftpd 2.0.7 Vsftpd Project Vsftpd 2.1.0 Vsftpd Project Vsftpd 2.1.1 Vsftpd Project Vsftpd 2.1.2 Vsftpd Project Vsftpd 2.2.0 Vsftpd Project Vsftpd 2.2.1 Vsftpd Project Vsftpd 2.2.2 Vsftpd Project Vsftpd 2.3.0 Vsftpd Project Vsftpd 2.3.1 Vsftpd Project Vsftpd 2.3.2 Vsftpd Project Vsftpd 2.3.3 Vsftpd Project Vsftpd 2.3.4 Vsftpd Project Vsftpd 2.3.5 Vsftpd Project Vsftpd 3.0.0 Vsftpd Project Vsftpd 3.0.1 Vsftpd Project Vsftpd 3.0.2 Vsftpd Project Vsftpd 3.0.3	42
OS	Fedoraproject Fedoraproject Fedora 33 Fedoraproject Fedora 34 Fedoraproject Fedora 35	3
OS	Debian Debian Debian Linux 10.0	1

Vulnerabilities > CVE-2021-3618 {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Vulnerabilities","item":"https://cyber.vumetric.com/vulns/"},{"@type":"ListItem","position":2,"name":"CVE-2021-3618"}]}

Summary

Vulnerable Configurations

References

Vulnerabilities > CVE-2021-3618