ALPINE-CVE-2021-3618
Record from OSV · Published March 23, 2022
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.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| nginx | Alpine:v3.15 | 1.20.1-r1 |
| nginx | Alpine:v3.16 | 1.20.1-r1 |
| nginx | Alpine:v3.17 | 1.20.1-r1 |
| nginx | Alpine:v3.22 | 1.20.1-r1 |
| nginx | Alpine:v3.21 | 1.20.1-r1 |
| nginx | Alpine:v3.18 | 1.20.1-r1 |
| nginx | Alpine:v3.20 | 1.20.1-r1 |
| nginx | Alpine:v3.23 | 1.20.1-r1 |
| nginx | Alpine:v3.19 | 1.20.1-r1 |
| nginx | Alpine:v3.24 | 1.20.1-r1 |
| nginx | Alpine:v3.14 | 1.20.1-r1 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Alpine:v3.15 | nginx | 1.2.8-r0, 1.12.1-r2, 1.4.5-r0 |
| Alpine:v3.16 | nginx | 1.14.0-r1, 1.12.1-r1, 1.20.1-r0 |
| Alpine:v3.17 | nginx | 1.4.2-r1, 1.12.2-r4, 1.12.2-r5 |
| Alpine:v3.22 | nginx | 0, 0.8.53-r0, 0.8.54-r1 |
| Alpine:v3.21 | nginx | 1.18.0-r13, 1.10.3-r5, 1.0.11-r0 |
| Alpine:v3.18 | nginx | 1.16.0-r2, 1.2.4-r0, 1.10.3-r5 |
| Alpine:v3.20 | nginx | 0, 0.8.53-r0, 0.8.54-r0 |
| Alpine:v3.23 | nginx | 1.10.1-r6, 1.10.3-r0, 1.2.5-r0 |
| Alpine:v3.19 | nginx | 1.12.1-r2, 0, 0.8.54-r0 |
| Alpine:v3.24 | nginx | 0 |
| Alpine:v3.14 | nginx | 0.8.53-r0, 0.8.54-r0, 1.12.1-r1 |
Timeline
- Mar 23, 2022 CVE Published
- Jun 15, 2026 CVE Updated
- Aug 8, 2026 Distribution Patch
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln ALPINE-CVE-2021-3618
vulnetix vdb fixes ALPINE-CVE-2021-3618Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
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