VDB
ALPINE-CVE-2021-33193
ALPINE-CVE-2021-33193
PUBLISHED
CVSS 7.5 HIGH
Record from OSV · Published August 16, 2021
A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| apache2 | Alpine:v3.12 | 2.4.49-r0 |
| apache2 | Alpine:v3.17 | 2.4.49-r0 |
| apache2 | Alpine:v3.21 | 2.4.49-r0 |
| apache2 | Alpine:v3.23 | 2.4.49-r0 |
| apache2 | Alpine:v3.19 | 2.4.49-r0 |
| apache2 | Alpine:v3.15 | 2.4.49-r0 |
| apache2 | Alpine:v3.22 | 2.4.49-r0 |
| apache2 | Alpine:v3.14 | 2.4.49-r0 |
| apache2 | Alpine:v3.11 | 2.4.49-r0 |
| apache2 | Alpine:v3.18 | 2.4.49-r0 |
| apache2 | Alpine:v3.16 | 2.4.49-r0 |
| apache2 | Alpine:v3.20 | 2.4.49-r0 |
2 more packages have a fixed version. See every fix in Lookup.
Risk scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Alpine:v3.12 | apache2 | 2.2.17-r1, 2.2.17-r0, 2.2.16-r2 |
| Alpine:v3.17 | apache2 | 2.2.17-r0, 2.2.16-r1, 2.2.16-r0 |
| Alpine:v3.21 | apache2 | 2.4.23-r0, 2.4.37-r0, 2.4.38-r0 |
| Alpine:v3.23 | apache2 | 2.4.23-r5, 0, 2.2.16-r0 |
| Alpine:v3.19 | apache2 | 2.4.27-r1, 2.2.22-r0, 2.4.23-r10 |
| Alpine:v3.15 | apache2 | 2.4.23-r2, 2.2.17-r0, 2.2.17-r2 |
| Alpine:v3.22 | apache2 | 2.4.23-r6, 2.2.16-r1, 2.2.16-r3 |
| Alpine:v3.14 | apache2 | 2.4.33-r1, 2.2.16-r3, 2.2.17-r4 |
| Alpine:v3.11 | apache2 | 2.2.16-r3, 2.2.16-r2, 2.2.16-r1 |
| Alpine:v3.18 | apache2 | 2.2.17-r0, 2.4.23-r3, 2.4.23-r5 |
| Alpine:v3.16 | apache2 | 2.2.16-r1, 2.2.16-r2, 2.2.17-r0 |
| Alpine:v3.20 | apache2 | 2.2.16-r2, 2.4.25-r1, 2.4.46-r2 |
| Alpine:v3.24 | apache2 | 0 |
| Alpine:v3.13 | apache2 | 2.4.17-r2, 2.4.6-r3, 2.4.3-r1 |
Timeline
- Aug 16, 2021 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-2021-33193
vulnetix vdb fixes ALPINE-CVE-2021-33193Or with curl, using the org id and key from your account page:
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