Apache · HTTP Server
CVE-2021-41773
Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49
De quoi s'agit-il
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.
CISA: Apache HTTP Server contains a path traversal vulnerability that allows an attacker to perform remote code execution if files outside directories configured by Alias-like directives are not under default �require all denied� or if CGI scripts are enabled. The original patch issued under this CVE ID is insufficient, please review remediation information under CVE-2021-42013.
Que faire
Apply updates per vendor instructions.
Échéance pour les agences fédérales américaines : 17 novembre 2021
- Ajoutée à la liste de la CISA
- 3 novembre 2021
- Publiée
- 5 octobre 2021
- Gravité
- Élevé 7,5 CVSS 3.1
- Probabilité d'attaques dans les 30 prochains jours (EPSS)
- >99,9% dans les 0,1% les plus à risque de toutes les failles connues
- Faiblesse
- CWE-22
- Plus de détails
- NVD · CVE.org · CISA
Toutes les références (20)
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ
- https://httpd.apache.org/security/vulnerabilities_24.html
- https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f%40%3Cusers.htt…
- https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45%40%3Cannounce.…
- http://www.openwall.com/lists/oss-security/2021/10/05/2
- http://www.openwall.com/lists/oss-security/2021/10/07/1
- https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.…
- https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.htt…
- http://www.openwall.com/lists/oss-security/2021/10/07/6
- http://www.openwall.com/lists/oss-security/2021/10/08/1
- https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd…
- http://www.openwall.com/lists/oss-security/2021/10/08/2
- http://www.openwall.com/lists/oss-security/2021/10/08/3
- http://www.openwall.com/lists/oss-security/2021/10/08/4
- http://www.openwall.com/lists/oss-security/2021/10/08/6
- http://www.openwall.com/lists/oss-security/2021/10/08/5
- http://www.openwall.com/lists/oss-security/2021/10/09/1
- http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html
- http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.ht…
- http://www.openwall.com/lists/oss-security/2021/10/11/4
Autres failles exploitées chez Apache
| Ajouté | Faille | Produit | Gravité | Risque d'attaque |
|---|---|---|---|---|
| 1 mai 2025 | Improper Escaping of Output | HTTP Server | Critique 9,1 | >99,9% |
| 3 nov. 2021 | Privilege Escalation | HTTP Server | Élevé 7,8 | 65% |
| 3 nov. 2021 | Path Traversal | HTTP Server | Critique 9,8 | >99,9% |
| 8 oct. 2026 | Command Injection | Struts | Élevé 8,1 | 97% |
| 4 août 2026 | Missing Encryption of Sensitive Data | Tomcat | Élevé 7,5 | 99% |
| 16 avr. 2026 | Improper Input Validation | ActiveMQ | Élevé 8,8 | 98% |
| 1 avr. 2025 | Path Equivalence | Tomcat | Critique 10,0 | 99,9% |
| 4 févr. 2025 | Forced Browsing | OFBiz | Critique 9,8 | >99,9% |
Sources : Known Exploited Vulnerabilities (CISA, domaine public), CVE records (cve.org) et EPSS (FIRST). Le risque d'attaque est l'estimation EPSS qu'une personne tente d'exploiter la faille dans les 30 prochains jours.