Apache Tomcat 8.5.x < 8.5.13 / 9.0.x < 9.0.0.M19 Multiple Vulnerabilities

critical Nessus Plugin ID 99368
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The remote Apache Tomcat server is affected by multiple vulnerabilities.


According to its self-reported version number, the Apache Tomcat service running on the remote host is 8.5.x prior to 8.5.13 or 9.0.x prior to 9.0.0.M19. It is therefore affected by multiple vulnerabilities :

- A flaw exists in the handling of pipelined requests when send file processing is used that results in the pipelined request being lost when processing of the previous request has completed, causing responses to be sent for the wrong request. An unauthenticated, remote attacker can exploit this to disclose sensitive information. (CVE-2017-5647)

- A flaw exists in the handling of HTTP/2 GOAWAY frames for a connection due to streams associated with the connection not being properly closed if the connection was currently waiting for a WINDOW_UPDATE before allowing the application to write more data. Each stream consumes a processing thread in the system. An unauthenticated, remote attacker can exploit this issue, via a series of specially crafted HTTP/2 requests, to consume all available threads, resulting in a denial of service condition. (CVE-2017-5650)

- A flaw exists in HTTP connectors when processing send files. If processing completed quickly, it was possible to add the processor to the processor cache twice, which allows the same processor to be used for multiple requests. An unauthenticated, remote attacker can exploit this to disclose sensitive information from other sessions or cause unexpected errors.

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


Upgrade to Apache Tomcat version 8.5.13 / 9.0.0.M19 or later.

See Also



Plugin Details

Severity: Critical

ID: 99368

File Name: tomcat_8_5_13.nasl

Version: 1.12

Type: combined

Agent: windows, macosx, unix

Family: Web Servers

Published: 4/14/2017

Updated: 3/11/2020

Dependencies: tomcat_error_version.nasl, tomcat_win_installed.nbin, apache_tomcat_nix_installed.nbin

Risk Information

CVSS Score Source: CVE-2017-5651


Risk Factor: Medium

Score: 5.9


Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

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


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

Vulnerability Information

CPE: cpe:/a:apache:tomcat

Required KB Items: installed_sw/Apache Tomcat

Exploit Ease: No known exploits are available

Patch Publication Date: 3/30/2017

Vulnerability Publication Date: 3/24/2017

Reference Information

CVE: CVE-2017-5647, CVE-2017-5650, CVE-2017-5651

BID: 97529, 97531, 97544