Detections
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Alpine: multiple apache2 packages: security update to 2.4.50-r0

critical Tenable Cloud Security Plugin ID 423656

Description

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

 - While fuzzing the 2.4.49 httpd, a new null pointer dereference was detected during HTTP/2 request
 processing, allowing an external source to DoS the server. This requires a specially crafted request. The
 vulnerability was recently introduced in version 2.4.49. No exploit is known to the project.
 (CVE-2021-41524)

 - 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. (CVE-2021-41773)

See Also

https://security.alpinelinux.org/vuln/CVE-2021-41524

https://security.alpinelinux.org/vuln/CVE-2021-41773

Plugin Details

Severity: Critical

ID: 423656

Version: Revision 1.17

Type: Local

Published: 4/4/2025

Updated: 7/10/2026

Supported Sensors: Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Critical

Score: 9.5

Percentile: 99.86

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS Score Source: CVE-2021-41773

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.4

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:H/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 10/4/2021

CISA Known Exploited Vulnerability Due Dates: 11/17/2021

Exploitable With

CANVAS (CANVAS)

Metasploit (Apache 2.4.49/2.4.50 Traversal RCE)

Reference Information

CVE: CVE-2021-41524, CVE-2021-41773

IAVA: 2021-A-0451-S