VDB
ALPINE-CVE-2021-3618
ALPINE-CVE-2021-3618
PUBLISHED
CVSS 7.400000095367432 HIGH
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.
Risk Scores
CVSS 3.1
7.400000095367432
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Alpine:v3.15 | nginx | 0, 1.9.14-r1, 1.9.14-r0 |
| Alpine:v3.16 | nginx | 0, 1.9.14-r1, 1.9.14-r0 |
| Alpine:v3.17 | nginx | 0, 1.9.14-r1, 1.9.14-r0 |
| Alpine:v3.22 | nginx | 0, 0.8.53-r0, 0.8.54-r1 |
| Alpine:v3.21 | nginx | 0, 1.9.14-r1, 1.9.14-r0 |
| Alpine:v3.18 | nginx | 0, 1.9.14-r1, 1.9.14-r0 |
| Alpine:v3.20 | nginx | 0, 0.8.53-r0, 0.8.54-r0 |
| Alpine:v3.23 | nginx | 0, 1.9.14-r1, 1.9.14-r0 |
| Alpine:v3.19 | nginx | 1.4.4-r2, 0, 0.8.54-r0 |
| Alpine:v3.24 | nginx | 0 |
| Alpine:v3.14 | nginx | 0, 0.8.53-r0, 0.8.54-r0 |
Timeline
- Mar 23, 2022 CVE Published
- Apr 30, 2026 Distribution Patch
- Jun 15, 2026 CVE Updated