Splunk Enterprise 8.1.x < 8.1.5, 8.2.x < 8.2.1 Authentication Bypass

high Nessus Plugin ID 163434


An application running on a remote web server host may be affected by an authentication bypass vulnerability.


A crafted request bypasses S2S TCP Token authentication writing arbitrary events to an index in Splunk Enterprise Indexer 8.1 versions before 8.1.5 and 8.2 versions before 8.2.1. The vulnerability impacts Indexers configured to use TCPTokens. It does not impact Universal Forwarders.

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


Upgrade Splunk Enterprise to version 8.1.5, 8.2.1, or later.

See Also


Plugin Details

Severity: High

ID: 163434

File Name: splunk_821.nasl

Version: 1.4

Type: combined

Agent: unix

Family: CGI abuses

Published: 7/25/2022

Updated: 9/5/2022

Supported Sensors: Nessus Agent

Risk Information


Risk Factor: Low

Score: 3.6


Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

Temporal Vector: E:U/RL:OF/RC:C

CVSS Score Source: CVE-2021-31559


Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:splunk:splunk

Required KB Items: installed_sw/Splunk

Exploit Ease: No known exploits are available

Patch Publication Date: 5/4/2022

Vulnerability Publication Date: 5/3/2022

Reference Information

CVE: CVE-2021-31559

IAVA: 2022-A-0251-S