Detections
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Alpine: multiple apache2 packages: security update to 2.4.51-r0

critical Tenable Cloud Security Plugin ID 423678

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - It was found that the fix for CVE-2021-41773 in Apache HTTP Server 2.4.50 was insufficient. 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 only affects Apache 2.4.49 and Apache
 2.4.50 and not earlier versions. (CVE-2021-42013)

See Also

https://security.alpinelinux.org/vuln/CVE-2021-42013

Plugin Details

Severity: Critical

ID: 423678

Version: Revision 1.9

Type: Local

Published: 4/4/2025

Updated: 7/6/2026

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

Risk Information

VPR

Risk Factor: High

Score: 8.9

Percentile: 99.7

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.2

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

CVSS Score Source: CVE-2021-42013

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

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:F/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 10/7/2021

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

Exploitable With

CANVAS (CANVAS)

Metasploit (Apache 2.4.49/2.4.50 Traversal RCE)

Elliot (Apache 2.4.50 RCE)

Reference Information

CVE: CVE-2021-42013

IAVA: 2021-A-0451-S