CBL Mariner 2.0 Security Update: httpd (CVE-2021-26691)

critical Nessus Plugin ID 172960


The remote CBL Mariner host is missing one or more security updates.


The version of httpd installed on the remote CBL Mariner 2.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2021-26691 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)

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


Update the affected packages.

See Also


Plugin Details

Severity: Critical

ID: 172960

File Name: mariner_httpd_CVE-2021-26691.nasl

Version: 1.1

Type: local

Published: 3/20/2023

Updated: 3/28/2023

Supported Sensors: Nessus

Risk Information


Risk Factor: Medium

Score: 6.7


Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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: 8.5

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:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:microsoft:cbl-mariner:httpd, p-cpe:/a:microsoft:cbl-mariner:httpd-debuginfo, p-cpe:/a:microsoft:cbl-mariner:httpd-devel, p-cpe:/a:microsoft:cbl-mariner:httpd-docs, p-cpe:/a:microsoft:cbl-mariner:httpd-tools, p-cpe:/a:microsoft:cbl-mariner:mod_ldap, p-cpe:/a:microsoft:cbl-mariner:mod_proxy_html, p-cpe:/a:microsoft:cbl-mariner:mod_session, p-cpe:/a:microsoft:cbl-mariner:mod_ssl, x-cpe:/o:microsoft:cbl-mariner

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

Exploit Ease: No known exploits are available

Patch Publication Date: 6/8/2021

Vulnerability Publication Date: 6/1/2021

Reference Information

CVE: CVE-2021-26691