DEBIAN-CVE-2021-41773
Record from OSV · Published October 5, 2021
A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration "require all denied", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013.
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 | Debian:14 | 2.4.50-1 |
| apache2 | Debian:12 | 2.4.50-1 |
| apache2 | Debian:13 | 2.4.50-1 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Debian:14 | apache2 | 0 |
| Debian:12 | apache2 | 0 |
| Debian:13 | apache2 | 0 |
Timeline
- Oct 5, 2021 CVE Published
- Oct 23, 2026 CVE Updated
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