CVE-2021-3618

    Dashboard / Vulnerabilities / CVE-2021-3618

    CVE-2021-3618

    Published: 23 Mar 2022Last Modified: 8 Jul 2026

    Summary:

    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: https://alpaca-attack.com/, https://lists.debian.org/debian-lts-announce/2022/11/msg00031.html, https://bugzilla.redhat.com/show_bug.cgi?id=1975623

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -ffcf93a6bf0c203c136e9ee9d65b81659ca9f7b6

    Affected versions

    release-1.19.10
    release-1.19.9
    release-1.19.8
    release-1.19.7
    release-1.19.6
    release-1.19.5
    release-1.19.4
    release-1.19.3
    release-1.19.2
    release-1.19.1
    release-1.19.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-3618 | CVE-DB