Rocky Linux 8 : httpd:2.4 (RLSA-2021:3816)

critical Nessus Plugin ID 184785


The remote Rocky Linux host is missing one or more security updates.


The remote Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2021:3816 advisory.

- In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow (CVE-2021-26691)

- A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier. (CVE-2021-40438)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.


Update the affected packages.

See Also

Plugin Details

Severity: Critical

ID: 184785

File Name: rocky_linux_RLSA-2021-3816.nasl

Version: 1.0

Type: local

Published: 11/6/2023

Updated: 11/6/2023

Supported Sensors: Nessus

Risk Information


Risk Factor: High

Score: 8.1


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-2021-26691


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

CPE: p-cpe:/a:rocky:linux:httpd-filesystem, p-cpe:/a:rocky:linux:httpd-manual, p-cpe:/a:rocky:linux:httpd-tools, p-cpe:/a:rocky:linux:httpd-tools-debuginfo, p-cpe:/a:rocky:linux:mod_http2, p-cpe:/a:rocky:linux:mod_http2-debuginfo, p-cpe:/a:rocky:linux:mod_http2-debugsource, p-cpe:/a:rocky:linux:mod_ldap, p-cpe:/a:rocky:linux:mod_ldap-debuginfo, p-cpe:/a:rocky:linux:mod_md, p-cpe:/a:rocky:linux:httpd, p-cpe:/a:rocky:linux:httpd-debuginfo, p-cpe:/a:rocky:linux:httpd-debugsource, p-cpe:/a:rocky:linux:httpd-devel, p-cpe:/a:rocky:linux:mod_md-debuginfo, p-cpe:/a:rocky:linux:mod_md-debugsource, p-cpe:/a:rocky:linux:mod_proxy_html, p-cpe:/a:rocky:linux:mod_proxy_html-debuginfo, p-cpe:/a:rocky:linux:mod_session, p-cpe:/a:rocky:linux:mod_session-debuginfo, p-cpe:/a:rocky:linux:mod_ssl, p-cpe:/a:rocky:linux:mod_ssl-debuginfo, cpe:/o:rocky:linux:8

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/RockyLinux/release, Host/RockyLinux/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/12/2021

Vulnerability Publication Date: 6/1/2021

CISA Known Exploited Vulnerability Due Dates: 12/15/2021

Reference Information

CVE: CVE-2021-26691, CVE-2021-40438