Vulnerability Report

CVE-2021-3618

Title: Vsftpd Project Vsftpd

Other

Proof Of Concept

No public PoC currently indexed for CVE-2021-3618.

CWE Category CWE-295
Published Date Mar 23, 2022
Modified Date Nov 21, 2024
Exploit Status Not Found
Score 7.4 CVSS v3.1
Exploit Probability (EPSS)
0.61%

Vulnerability Summary

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.

Impacted Vendors

N
nginx 1
V
vsftpd_project 1
E
eric_allman 1
S
sendmail 1
R
redhat 1
B
beasts 1
F
f5 1

Reference Links

https://alpaca-attack.com/ https://bugzilla.redhat.com/show_bug.cgi?id=1975623 https://lists.debian.org/debian-lts-announce/2022/11/msg00031.html https://alpaca-attack.com/ https://bugzilla.redhat.com/show_bug.cgi?id=1975623 https://lists.debian.org/debian-lts-announce/2022/11/msg00031.html
CVSS v3.1
Source Entity [email protected]
Severity HIGH
7.4
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
5.8
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:M/Au:N/C:P/I:P/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-3618 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity HIGH
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected Stack

No specific products linked.