CRITICAL🚩 CISA KEV⚡ EXPLOIT✓ PATCH🇵🇱 Wersja polska

CVE-2021-41773

CVSS 9.8v3.1pub. 2021-10-05upd. 2026-02-17

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Apache HTTP Server
APP
Apache
2.4.49
Fedora Project Fedora
OS
Fedoraproject
3435
Netapp Cloud Backup
APP
Netapp
wszystkie wersje
Oracle Instantis Enterprisetrack
APP
Oracle
17.117.217.3

CISA KEV — detailsi

Vendori: Apache ↗
Producti: HTTP Server
Added to KEVi: November 3, 2021
Remediation deadline (US Federal)i: November 17, 2021(overdue)
Ransomwarei: Active ransomware campaigns exploit this vulnerability

🔧Advisory Apache↗🇺🇸CISA KEV (original)↗

Required action (CISA)i

Apply updates per vendor instructions.

CISA descriptioni

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.

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