CVE-2021-41773highunder attackransomwareCWE-22

CVE-2021-41773: high-severity vulnerability in Apache HTTP Server

Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49

Published · Updated

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100Vexday Risk Score

Patch now. It under exploitation confirmed by CISA and has a working public exploit.

ssvc Actcvss 7.5epss 100%
from disclosure to weaponsame day
Published on NVDOct 5
1st PoCOct 5
metasploitMay 10
CISA KEV+29d
What the vendors declare (VEX)

Official vendor statements in CSAF/VEX format: whether their product is affected, already fixed, or ruled out — and why. These are the vendor's assertions, not Vexday's judgment.

Red HatVEX document ↗
Not affected
7 products (59 components) — because the vulnerable code is not present in the product
Red Hat Enterprise Linux 8 · Red Hat Enterprise Linux 9 · Red Hat Software Collections · Red Hat Enterprise Linux 7 · Red Hat JBoss Enterprise Application Platform 6 · and others 2
Action required by CISAfederal deadline: 2021-11-17

Apply updates per vendor instructions.

In short

Apache HTTP Server 2.4.49 has a flaw in how it processes file paths, allowing attackers to access files outside intended directories through specially crafted URLs. If those files aren't properly protected, attackers could read sensitive data or run malicious code if CGI scripts are enabled.

Technical detail

A path normalization bypass in Apache 2.4.49 enables directory traversal attacks to map URLs to files outside Alias-like directive scopes. The vulnerability requires files outside configured directories to lack default "require all denied" protections; exploitation can lead to information disclosure or RCE if CGI execution is permitted on aliased paths. This issue affects only version 2.4.49 and is actively exploited in the wild.

Summary generated and translated by AI from the official description.

The full analysis of this CVE is available in Portuguese →

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
Apache Software Foundation · Apache HTTP Server
public PoCs found — 341✓ VexDay Proof
exploitdb✓ VexDay Proofwww.exploit-db.com/exploits/50512exploitdb✓ VexDay Proofwww.exploit-db.com/exploits/50383githubgithub.com/blasty/CVE-2021-41773★ 211githubgithub.com/inbug-team/CVE-2021-41773_CVE-2021-42013★ 147githubgithub.com/thehackersbrain/CVE-2021-41773★ 113githubgithub.com/HightechSec/scarce-apache2★ 62githubgithub.com/MrCl0wnLab/SimplesApachePathTraversal★ 61githubgithub.com/iilegacyyii/PoC-CVE-2021-41773★ 52githubgithub.com/lorddemon/CVE-2021-41773-PoC★ 39githubgithub.com/Vulnmachines/cve-2021-41773★ 38githubgithub.com/justakazh/mass_cve-2021-41773★ 29githubgithub.com/im-hanzou/apachrot★ 23githubgithub.com/BlueTeamSteve/CVE-2021-41773★ 23githubgithub.com/Ls4ss/CVE-2021-41773_CVE-2021-42013★ 20githubgithub.com/ZephrFish/CVE-2021-41773-PoC★ 17githubgithub.com/wangfly-me/Apache_Penetration_Tool★ 14githubgithub.com/j4k0m/CVE-2021-41773★ 13githubgithub.com/blackn0te/Apache-HTTP-Server-2.4.49-2.4.50-Path-Traversal-Remote-Code-Execution★ 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⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — Apache HTTP Server

In the same product, most dangerous first.

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