CVE-2016-6816: 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…
Noroxi assessment
Priority: Plan (action score 40/100)
- Public proof-of-concept code exists (Exploit-DB); there is no record of exploitation in the wild.
- Probability of exploitation in the next 30 days: 39.6% (FIRST EPSS); higher than 98.6% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
- Fixed version: tomcat6 (Debian:7) 6.0.45+dfsg-1~deb7u3; tomcat7 (Debian:7) 7.0.28-4+deb7u7; tomcat7 (Debian:8) 7.0.56-3+deb8u6.
Add it to your regular patch cycle. Upgrade to tomcat6 (Debian:7) 6.0.45+dfsg-1~deb7u3; tomcat7 (Debian:7) 7.0.28-4+deb7u7; tomcat7 (Debian:8) 7.0.56-3+deb8u6 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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.
- Published
- Mar 20, 2017
- Updated
- Jun 16, 2026
- EPSS
- 39.6% · 98th percentile
- CWE
- CWE-20
Report tools
Action score
40
Add it to your regular patch cycle.
- CVSS
- 28 / 40 · 7.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 12 / 30 · 39.6%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- Proof of concept exists, no weaponized module
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| apache | tomcat | cpe:2.3:a:apache:tomcat |
Versions reported by the vendor
Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.
Apache Software Foundation 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, 6.0.0 to 6.0.47, Earlier, unsupported versions may also be affected.affected
Affected versions · NVD (20)
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apache tomcat6.0.0
- apache tomcat6.0.1
- apache tomcat6.0.10
- apache tomcat6.0.11
- apache tomcat6.0.12
- apache tomcat6.0.13
- apache tomcat6.0.14
- apache tomcat6.0.15
- apache tomcat6.0.16
- apache tomcat6.0.17
- apache tomcat6.0.18
- apache tomcat6.0.19
- apache tomcat6.0.2
- apache tomcat6.0.20
- apache tomcat6.0.21
- apache tomcat6.0.22
- apache tomcat6.0.23
- apache tomcat6.0.24
- apache tomcat6.0.25
- apache tomcat6.0.26
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:7 | tomcat6 | before 6.0.45+dfsg-1~deb7u3 | 6.0.45+dfsg-1~deb7u3 |
| Debian:7 | tomcat7 | before 7.0.28-4+deb7u7 | 7.0.28-4+deb7u7 |
| Debian:8 | tomcat7 | before 7.0.56-3+deb8u6 | 7.0.56-3+deb8u6 |
| Debian:8 | tomcat8 | before 8.0.14-1+deb8u5 | 8.0.14-1+deb8u5 |
| Maven | org.apache.tomcat:tomcat-coyote | from 6.0.0 · before 6.0.48 | 6.0.48 |
| Maven | org.apache.tomcat:tomcat-coyote | from 7.0.0 · before 7.0.73 | 7.0.73 |
| Maven | org.apache.tomcat:tomcat-coyote | from 8.0.0RC1 · before 8.0.39 | 8.0.39 |
| Maven | org.apache.tomcat:tomcat-coyote | from 8.5.0 · before 8.5.8 | 8.5.8 |
| Maven | org.apache.tomcat:tomcat-coyote | from 9.0.0.M1 · before 9.0.0.M12 | 9.0.0.M12 |
| Red Hat:enterprise_linux:6::client | tomcat6 | before 0:6.0.24-105.el6_8 | 0:6.0.24-105.el6_8 |
| Red Hat:enterprise_linux:6::client | tomcat6-admin-webapps | before 0:6.0.24-105.el6_8 | 0:6.0.24-105.el6_8 |
| Red Hat:enterprise_linux:6::client | tomcat6-docs-webapp | before 0:6.0.24-105.el6_8 | 0:6.0.24-105.el6_8 |
| Red Hat:enterprise_linux:6::client | tomcat6-el-2.1-api | before 0:6.0.24-105.el6_8 | 0:6.0.24-105.el6_8 |
| Red Hat:enterprise_linux:6::client | tomcat6-javadoc | before 0:6.0.24-105.el6_8 | 0:6.0.24-105.el6_8 |
| Red Hat:enterprise_linux:6::client | tomcat6-jsp-2.1-api | before 0:6.0.24-105.el6_8 | 0:6.0.24-105.el6_8 |
| Red Hat:enterprise_linux:6::client | tomcat6-lib | before 0:6.0.24-105.el6_8 | 0:6.0.24-105.el6_8 |
| Red Hat:enterprise_linux:6::client | tomcat6-servlet-2.5-api | before 0:6.0.24-105.el6_8 | 0:6.0.24-105.el6_8 |
| Red Hat:enterprise_linux:6::client | tomcat6-webapps | before 0:6.0.24-105.el6_8 | 0:6.0.24-105.el6_8 |
| Red Hat:enterprise_linux:7::client | tomcat | before 0:7.0.69-11.el7_3 | 0:7.0.69-11.el7_3 |
| Red Hat:enterprise_linux:7::client | tomcat-admin-webapps | before 0:7.0.69-11.el7_3 | 0:7.0.69-11.el7_3 |
| Red Hat:enterprise_linux:7::client | tomcat-docs-webapp | before 0:7.0.69-11.el7_3 | 0:7.0.69-11.el7_3 |
| Red Hat:enterprise_linux:7::client | tomcat-el-2.2-api | before 0:7.0.69-11.el7_3 | 0:7.0.69-11.el7_3 |
| Red Hat:enterprise_linux:7::client | tomcat-javadoc | before 0:7.0.69-11.el7_3 | 0:7.0.69-11.el7_3 |
| Red Hat:enterprise_linux:7::client | tomcat-jsp-2.2-api | before 0:7.0.69-11.el7_3 | 0:7.0.69-11.el7_3 |
+96
Same product
apache: all recordsOther highest-scoring records for the same primary product.
- CVE-2025-24813Apache Tomcat: Potential RCE and/or information disclosure and/or information corruption with partial PUTKEV99Now
- CVE-2016-8735Remote code execution is possible with Apache Tomcat before 6.0.48, 7.x before 7.0.73, 8.x before 8.0.39, 8.5.x before 8.5.7, and 9.x…KEV96Now
- CVE-2017-12617When running Apache Tomcat versions 9.0.0.M1 to 9.0.0, 8.5.0 to 8.5.22, 8.0.0.RC1 to 8.0.46 and 7.0.0 to 7.0.81 with HTTP PUTs enabled (e.g.KEV92Now
Published before and after this one in the same product
- ← EarlierCVE-2016-6325Oct 13, 2016 · The Tomcat package on Red Hat Enterprise Linux (RHEL) 5 through 7, JBoss Web Server 3.0, and JBoss EWS 2 uses weak permissions for (1)…31Monitor
- ← EarlierCVE-2016-8747Mar 14, 2017 · An information disclosure issue was discovered in Apache Tomcat 8.5.7 to 8.5.9 and 9.0.0.M11 to 9.0.0.M15 in reverse-proxy configurations.32Monitor
- Later →CVE-2017-5650Apr 17, 2017 · In Apache Tomcat 9.0.0.M1 to 9.0.0.M18 and 8.5.0 to 8.5.12, the handling of an HTTP/2 GOAWAY frame for a connection did not close streams…32Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:tomcat6 | 6.0.45+dfsg-1~deb7u3 · Debian:7 | Package registry (OSV) |
| debian:tomcat7 | 7.0.28-4+deb7u7 · Debian:7 | Package registry (OSV) |
| debian:tomcat8 | 8.0.14-1+deb8u5 · Debian:8 | Package registry (OSV) |
| Maven:org.apache.tomcat:tomcat-coyote | 6.0.48 | Package registry (OSV) |
| Maven:org.apache.tomcat:tomcat-coyote | 7.0.73 | Package registry (OSV) |
| Maven:org.apache.tomcat:tomcat-coyote | 8.0.39 | Package registry (OSV) |
| Maven:org.apache.tomcat:tomcat-coyote | 8.5.8 | Package registry (OSV) |
| Maven:org.apache.tomcat:tomcat-coyote | 9.0.0.M12 | Package registry (OSV) |
| red hat:apache-cxf | 0:2.7.18-5.SP4_redhat_1.1.ep6.el6 · Red Hat:jboss_enterprise_application_platform:6::el6 | Package registry (OSV) |
| red hat:hornetq | 0:2.3.25-18.SP16_redhat_1.1.ep6.el6 · Red Hat:jboss_enterprise_application_platform:6::el6 | Package registry (OSV) |
| red hat:infinispan | 0:5.2.20-1.Final_redhat_1.1.ep6.el6 · Red Hat:jboss_enterprise_application_platform:6::el6 | Package registry (OSV) |
| red hat:infinispan-cachestore-jdbc | 0:5.2.20-1.Final_redhat_1.1.ep6.el6 · Red Hat:jboss_enterprise_application_platform:6::el6 | Package registry (OSV) |
| red hat:infinispan-cachestore-remote | 0:5.2.20-1.Final_redhat_1.1.ep6.el6 · Red Hat:jboss_enterprise_application_platform:6::el6 | Package registry (OSV) |
| red hat:infinispan-client-hotrod | 0:5.2.20-1.Final_redhat_1.1.ep6.el6 · Red Hat:jboss_enterprise_application_platform:6::el6 | Package registry (OSV) |
| red hat:infinispan-core | 0:5.2.20-1.Final_redhat_1.1.ep6.el6 · Red Hat:jboss_enterprise_application_platform:6::el6 | Package registry (OSV) |
| red hat:jboss-as-appclient | 0:7.5.13-2.Final_redhat_2.1.ep6.el6 · Red Hat:jboss_enterprise_application_platform:6::el6 | Package registry (OSV) |
| red hat:jboss-as-cli | 0:7.5.13-2.Final_redhat_2.1.ep6.el6 · Red Hat:jboss_enterprise_application_platform:6::el6 | Package registry (OSV) |
| red hat:jboss-as-client-all | 0:7.5.13-2.Final_redhat_2.1.ep6.el6 · Red Hat:jboss_enterprise_application_platform:6::el6 | Package registry (OSV) |
| red hat:jboss-as-clustering | 0:7.5.13-2.Final_redhat_2.1.ep6.el6 · Red Hat:jboss_enterprise_application_platform:6::el6 | Package registry (OSV) |
| red hat:jboss-as-cmp | 0:7.5.13-2.Final_redhat_2.1.ep6.el6 · Red Hat:jboss_enterprise_application_platform:6::el6 | Package registry (OSV) |
| suse:tomcat | 8.0.32-10.13.2 · SUSE:Linux Enterprise Server 12 SP1 | Package registry (OSV) |
| suse:tomcat6 | 6.0.53-0.56.1 · SUSE:Linux Enterprise Point of Sale 11 SP3 | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Exploit-DB entry ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Exploit-DB entry | remote | 2017-04-04 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Published
- First PoC+14 d
- TodayNov 15, 2026+3527 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- low · data can be read
- Integrity
- low · data or configuration can be modified
- Availability
- low · the service can be disrupted
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality impact
- Low
- Integrity impact
- Low
- Availability impact
- Low
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- rhn.redhat.com/errata/RHSA-2017-0244.html
- rhn.redhat.com/errata/RHSA-2017-0245.html
- rhn.redhat.com/errata/RHSA-2017-0246.html
- rhn.redhat.com/errata/RHSA-2017-0247.html
- rhn.redhat.com/errata/RHSA-2017-0250.html
- rhn.redhat.com/errata/RHSA-2017-0457.html
- rhn.redhat.com/errata/RHSA-2017-0527.html
- www.debian.org/security/2016/dsa-3738
- www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- www.securityfocus.com/bid/94461
- www.securitytracker.com/id/1037332
- access.redhat.com/errata/RHSA-2017:0455
- access.redhat.com/errata/RHSA-2017:0935
- lists.apache.org/thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551%40%3Cdev.tomcat.apache.org%3E
- lists.apache.org/thread.html/37220405a377c0182d2afdbc36461c4783b2930fbeae3a17f1333113%40%3Cdev.tomcat.apache.org%3E
- lists.apache.org/thread.html/388a323769f1dff84c9ec905455aa73fbcb20338e3c7eb131457f708%40%3Cdev.tomcat.apache.org%3E
- lists.apache.org/thread.html/39ae1f0bd5867c15755a6f959b271ade1aea04ccdc3b2e639dcd903b%40%3Cdev.tomcat.apache.org%3E
- lists.apache.org/thread.html/3d19773b4cf0377db62d1e9328bf9160bf1819f04f988315086931d7%40%3Cdev.tomcat.apache.org%3E
- lists.apache.org/thread.html/6af47120905aa7d8fe12f42e8ff2284fb338ba141d3b77b8c7cb61b3%40%3Cdev.tomcat.apache.org%3E
Vendor advisories and official records. Exploit/PoC links are deliberately left out.