CVE-2016-6816

mediumpriority · attend · 52EPSS 0.396 · 99 %ileexploit · PoCDEEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

39.6% (99th) EPSS

CVSS 6.8 · medium

Is it mine?

194 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cert_bund · osv

EPSS · scored 2026-10-27

The code in Apache Tomcat 9.0.0.M1 to 9.0.0.M11, 8.5.0 to 8.5.6, 8.0.0.RC1 to 8.0.38, 7.0.0 to 7.0.72, and 6.0.0 to 6.0.47 that parsed the HTTP request line permitted invalid characters. This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache, perform an XSS attack and/or obtain sensitive information from requests other then their own.

cvss

Technical severity, 0–10. One row per scoring source.

7.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–7.1

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4

v3.07.1highCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Lprimary · NVD / NIST USexploitability 2.8 · impact 3.7

v3.07.1highCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Lsecondary · OSV

v3.07.1highCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L/E:Hsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimaryCWE-20US

exploits (1)

Public proof-of-concept and weaponised exploit code.

EDB-41783Apache Tomcat 6/7/8/9 - Information DisclosurePoC · exploit_db

affected products (194)

Products and version ranges known to be affected.

Apache Tomcat <6.0.48all versionscert_bundDE
Apache Tomcat <7.0.73all versionscert_bundDE
Apache Tomcat <8.0.39all versionscert_bundDE
Apache Tomcat <9.0.0.M13all versionscert_bundDE
Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
F5 ARXall versionscert_bundDEcpe:/a:f5:arx:-
F5 BIG-IPall versionscert_bundDEcpe:/a:f5:big-ip:-
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
Apache Tomcat< 6.0.48cert_bundDE
Apache Tomcat< 7.0.73cert_bundDE
Apache Tomcat< 8.0.39cert_bundDE
Apache Tomcat< 9.0.0.M13cert_bundDE
Apache Software Foundation Apache Tomcat≤ 9.0.0.M1 to 9.0.0.M11enisa_euvdEU
Apache Software Foundation Apache Tomcat≤ 6.0.0 to 6.0.47enisa_euvdEU
Apache Software Foundation Apache Tomcat≤ 8.0.0.RC1 to 8.0.38enisa_euvdEU
Apache Software Foundation Apache Tomcat≤ Earlier, unsupported versions may also be affected.enisa_euvdEU
Apache Software Foundation Apache Tomcat≤ 7.0.0 to 7.0.72enisa_euvdEU

showing 20 of 194

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2024-0528Dell Data Protection Advisor: Mehrere SchwachstellenDeutsch2024-02-29csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Dell Data Protection Advisor ausnutzen, um beliebigen Code auszuführen, einen Denial-of-Service-Zustand herbeizuführen, Dateien zu manipulieren, vertrauliche Informationen offenzulegen, seine Berechtigungen zu erweitern oder einen nicht spezifizierten Angriff durchzuführen.
WID-SEC-W-2025-0215Apache Tomcat: Mehrere SchwachstellenDeutsch2016-11-22csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Apache Tomcat ausnutzen, um einen Denial of Service Angriff durchzuführen, vertrauliche Informationen offenzulegen oder beliebigen Code zur Ausführung zu bringen.
GHSA-jc7p-5r39-9477Improper Input Validation in Apache Tomcat2022-05-13ghsa · osvUS
The code in Apache Tomcat 9.0.0.M1 to 9.0.0.M11, 8.5.0 to 8.5.6, 8.0.0.RC1 to 8.0.38, 7.0.0 to 7.0.72, and 6.0.0 to 6.0.47 that parsed the HTTP request line permitted invalid characters. This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache, perform an XSS attack and/or obtain sensitive information from requests other then their own.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund osv NVD CVE.org MITRE

published 2017-03-20modified 2026-06-17

related (25,176)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2026-88771US	critical9.8OT critical	82.2% (100th)	KEV	2026-09-27
Improper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS,…
CVE-2026-93952US	—OT critical	1.38% (72nd)	KEV	2026-09-22
VeloCloud Orchestrator (VCO) on-prem has a security issue where this issue may allow a remote attacker to access privileged internal functionality and impact the VCO host. Successf…
CVE-2026-12569US	critical9.8OT critical	46.0% (99th)	KEV	2026-06-18
A critical remote code execution (RCE) vulnerability has been reported in PTC Windchill PDMlink and PTC FlexPLM. The vulnerability may be exploited through the deserialization of u…
CVE-2026-34910US	—OT critical	90.0% (100th)	KEV	2026-05-22
A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection.
CVE-2026-6973US	—OT critical	34.5% (98th)	KEV	2026-05-07
An Improper Input Validation in Ivanti EPMM before versions 12.6.1.1, 12.7.0.1, and 12.8.0.1 allows a remotely authenticated user with administrative access to achieve remote code…

+25171 more

references (114)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan