7.4 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
5.8 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:P/A:N
0.001 Low
EPSS
Percentile
43.8%
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.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Debian | 12 | all | nginx | < 1.20.2-2 | nginx_1.20.2-2_all.deb |
Debian | 11 | all | nginx | < 1.18.0-6.1+deb11u2 | nginx_1.18.0-6.1+deb11u2_all.deb |
Debian | 10 | all | nginx | < 1.14.2-2+deb10u5 | nginx_1.14.2-2+deb10u5_all.deb |
Debian | 999 | all | nginx | < 1.20.2-2 | nginx_1.20.2-2_all.deb |
Debian | 13 | all | nginx | < 1.20.2-2 | nginx_1.20.2-2_all.deb |
Debian | 12 | all | sendmail | < 8.16.1-2 | sendmail_8.16.1-2_all.deb |
Debian | 11 | all | sendmail | <= 8.15.2-22 | sendmail_8.15.2-22_all.deb |
Debian | 10 | all | sendmail | <= 8.15.2-14~deb10u1 | sendmail_8.15.2-14~deb10u1_all.deb |
Debian | 999 | all | sendmail | < 8.16.1-2 | sendmail_8.16.1-2_all.deb |
Debian | 13 | all | sendmail | < 8.16.1-2 | sendmail_8.16.1-2_all.deb |
7.4 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
5.8 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:P/A:N
0.001 Low
EPSS
Percentile
43.8%