CVE-2021-41773
Published Oct 5, 2021
Last updated 6 months ago
- Description
- 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.
- Source
- security@apache.org
- NVD status
- Analyzed
- Products
- http_server, fedora, instantis_enterprisetrack, cloud_backup
CVSS 3.1
- Type
- Primary
- Base score
- 9.8
- Impact score
- 5.9
- Exploitability score
- 3.9
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Severity
- CRITICAL
CVSS 2.0
- Type
- Primary
- Base score
- 4.3
- Impact score
- 2.9
- Exploitability score
- 8.6
- Vector string
- AV:N/AC:M/Au:N/C:P/I:N/A:N
Data from CISA
- Vulnerability name
- Apache HTTP Server Path Traversal Vulnerability
- Exploit added on
- Nov 3, 2021
- Exploit action due
- Nov 17, 2021
- Required action
- Apply updates per vendor instructions.
- Hype score
- Not currently trending
Top KEVs hitting KEVIntel sensors this week: 1. CVE-2021-41773 - 732 2. CVE-2022-47945 - 466 3. CVE-2025-55182 - 337 4. CVE-2026-0770 - 178 5. CVE-2026-63030 - 113 2,497 exploitation attempts from 500 source IPs across our sensors. Patch what attackers are actually exploiting.
@kev_intel
23 Jul 2026
74 Impressions
0 Retweets
1 Like
0 Bookmarks
1 Reply
0 Quotes
⚠️ Weekly vuln radar. https://t.co/Cd6L8AD6Bt – spot what’s trending before it’s everywhere: CVE-2025-29824 CVE-2025-6543 CVE-2025-20337 CVE-2025-6558 (via @_clem1) CVE-2025-49144 CVE-2025-24985 CVE-2025-20274 CVE-2025-23266 (via @nirohfeld @shirtamari) CVE-2021-41773
@ptdbugs
18 Jul 2025
129 Impressions
0 Retweets
1 Like
0 Bookmarks
0 Replies
0 Quotes
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