CVE-2018-1336: An improper handing of overflow in the UTF-8 decoder with supplementary characters can lead to an infinite loop in the decoder causing a…
Noroxi assessment
Priority: Monitor (action score 36/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 20.3% (FIRST EPSS); higher than 97.5% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: tomcat8 (Debian:8) 8.0.14-1+deb8u13; tomcat8 (Debian:9) 8.5.14-1+deb9u3; org.apache.tomcat.embed:tomcat-embed-core (Maven) 7.0.87, 8.0.51, 8.5.31.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to tomcat8 (Debian:8) 8.0.14-1+deb8u13; tomcat8 (Debian:9) 8.5.14-1+deb9u3; org.apache.tomcat.embed:tomcat-embed-core (Maven) 7.0.87, 8.0.51, 8.5.31 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
An improper handing of overflow in the UTF-8 decoder with supplementary characters can lead to an infinite loop in the decoder causing a Denial of Service. Versions Affected: Apache Tomcat 9.0.0.M9 to 9.0.7, 8.5.0 to 8.5.30, 8.0.0.RC1 to 8.0.51, and 7.0.28 to 7.0.86.
- Published
- Aug 2, 2018
- Updated
- Jun 16, 2026
- EPSS
- 20.3% · 97th percentile
- CWE
- CWE-835
Report tools
Action score
36
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 6 / 30 · 20.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- 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
- No public exploit code on record
- 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 |
| redhat | jboss enterprise application platform | cpe:2.3:a:redhat:jboss_enterprise_application_platform |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| redhat | jboss enterprise web server | cpe:2.3:a:redhat:jboss_enterprise_web_server |
| redhat | enterprise linux | cpe:2.3:o:redhat:enterprise_linux |
| redhat | enterprise linux desktop | cpe:2.3:o:redhat:enterprise_linux_desktop |
| redhat | enterprise linux server | cpe:2.3:o:redhat:enterprise_linux_server |
| redhat | enterprise linux workstation | cpe:2.3:o:redhat:enterprise_linux_workstation |
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.M9 to 9.0.7, 8.5.0 to 8.5.30, 8.0.0.RC1 to 8.0.51, 7.0.28 to 7.0.86affected
Affected versions · NVD (17)
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apache tomcat7.0.28 and later · up to 7.0.86 inclusive
- apache tomcat8.0.0 and later · up to 8.0.51 inclusive
- apache tomcat8.5.0 and later · up to 8.5.30 inclusive
- apache tomcat9.0.1 and later · up to 9.0.7 inclusive
- apache tomcat8.0.0
- apache tomcat9.0.0
- canonical ubuntu linux14.04
- canonical ubuntu linux16.04
- debian debian linux8.0
- debian debian linux9.0
- redhat enterprise linux desktop7.0
- redhat enterprise linux server7.0
- redhat enterprise linux workstation7.0
- redhat jboss enterprise application platform6.0.0
- redhat jboss enterprise application platform6.4.0
- redhat jboss enterprise web server3.0.0
- redhat jboss enterprise web server5.0.0
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:8 | tomcat8 | before 8.0.14-1+deb8u13 | 8.0.14-1+deb8u13 |
| Debian:9 | tomcat8 | before 8.5.14-1+deb9u3 | 8.5.14-1+deb9u3 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | from 7.0.28 · before 7.0.87 | 7.0.87 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | from 8.0.0RC1 · before 8.0.51 | 8.0.51 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | from 8.5.0 · before 8.5.31 | 8.5.31 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | from 9.0.0.M9 · before 9.0.8 | 9.0.8 |
| openSUSE:Tumbleweed | tomcat | before 9.0.36-8.4 | 9.0.36-8.4 |
| openSUSE:Tumbleweed | tomcat10 | before 10.1.14-1.1 | 10.1.14-1.1 |
| Red Hat:enterprise_linux:7::client | tomcat | before 0:7.0.76-8.el7_5 | 0:7.0.76-8.el7_5 |
| Red Hat:enterprise_linux:7::client | tomcat-admin-webapps | before 0:7.0.76-8.el7_5 | 0:7.0.76-8.el7_5 |
| Red Hat:enterprise_linux:7::client | tomcat-docs-webapp | before 0:7.0.76-8.el7_5 | 0:7.0.76-8.el7_5 |
| Red Hat:enterprise_linux:7::client | tomcat-el-2.2-api | before 0:7.0.76-8.el7_5 | 0:7.0.76-8.el7_5 |
| Red Hat:enterprise_linux:7::client | tomcat-javadoc | before 0:7.0.76-8.el7_5 | 0:7.0.76-8.el7_5 |
| Red Hat:enterprise_linux:7::client | tomcat-jsp-2.2-api | before 0:7.0.76-8.el7_5 | 0:7.0.76-8.el7_5 |
| Red Hat:enterprise_linux:7::client | tomcat-jsvc | before 0:7.0.76-8.el7_5 | 0:7.0.76-8.el7_5 |
| Red Hat:enterprise_linux:7::client | tomcat-lib | before 0:7.0.76-8.el7_5 | 0:7.0.76-8.el7_5 |
| Red Hat:enterprise_linux:7::client | tomcat-servlet-3.0-api | before 0:7.0.76-8.el7_5 | 0:7.0.76-8.el7_5 |
| Red Hat:enterprise_linux:7::client | tomcat-webapps | before 0:7.0.76-8.el7_5 | 0:7.0.76-8.el7_5 |
| Red Hat:jboss_enterprise_application_platform:6::el5 | codehaus-jackson | before 0:1.9.9-14.redhat_7.1.ep6.el5 | 0:1.9.9-14.redhat_7.1.ep6.el5 |
| Red Hat:jboss_enterprise_application_platform:6::el5 | codehaus-jackson-core-asl | before 0:1.9.9-14.redhat_7.1.ep6.el5 | 0:1.9.9-14.redhat_7.1.ep6.el5 |
| Red Hat:jboss_enterprise_application_platform:6::el5 | codehaus-jackson-jaxrs | before 0:1.9.9-14.redhat_7.1.ep6.el5 | 0:1.9.9-14.redhat_7.1.ep6.el5 |
| Red Hat:jboss_enterprise_application_platform:6::el5 | codehaus-jackson-mapper-asl | before 0:1.9.9-14.redhat_7.1.ep6.el5 | 0:1.9.9-14.redhat_7.1.ep6.el5 |
| Red Hat:jboss_enterprise_application_platform:6::el5 | codehaus-jackson-xc | before 0:1.9.9-14.redhat_7.1.ep6.el5 | 0:1.9.9-14.redhat_7.1.ep6.el5 |
| Red Hat:jboss_enterprise_application_platform:6::el5 | guava-libraries | before 0:13.0.1-5.redhat_3.1.ep6.el5 | 0:13.0.1-5.redhat_3.1.ep6.el5 |
+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-2018-8014May 16, 2018 · The defaults settings for the CORS filter provided in Apache Tomcat 9.0.0.M1 to 9.0.8, 8.5.0 to 8.5.31, 8.0.0.RC1 to 8.0.52, 7.0.41 to…45Plan
- ← EarlierCVE-2018-8034Aug 1, 2018 · The host name verification when using TLS with the WebSocket client was missing.36Monitor
- Later →CVE-2018-8037Aug 2, 2018 · If an async request was completed by the application at the same time as the container triggered the async timeout, a race condition…26Monitor
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:tomcat8 | 8.0.14-1+deb8u13 · Debian:8 | Package registry (OSV) |
| Maven:org.apache.tomcat.embed:tomcat-embed-core | 7.0.87 | Package registry (OSV) |
| Maven:org.apache.tomcat.embed:tomcat-embed-core | 8.0.51 | Package registry (OSV) |
| Maven:org.apache.tomcat.embed:tomcat-embed-core | 8.5.31 | Package registry (OSV) |
| Maven:org.apache.tomcat.embed:tomcat-embed-core | 9.0.8 | Package registry (OSV) |
| opensuse:tomcat | 9.0.36-8.4 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:tomcat10 | 10.1.14-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:jws5 | 0:1-5.el7jws · Red Hat:jboss_enterprise_web_server:5.0::el7 | Package registry (OSV) |
| red hat:jws5-ecj | 0:4.6.1-5.redhat_1.1.el7jws · Red Hat:jboss_enterprise_web_server:5.0::el7 | Package registry (OSV) |
| red hat:jws5-javapackages-tools | 0:3.4.1-5.15.7.el7jws · Red Hat:jboss_enterprise_web_server:5.0::el7 | Package registry (OSV) |
| red hat:jws5-jboss-logging | 0:3.3.1-4.Final_redhat_1.1.el7jws · Red Hat:jboss_enterprise_web_server:5.0::el7 | Package registry (OSV) |
| red hat:jws5-mod_cluster | 0:1.4.0-8.Final_redhat_1.1.el7jws · Red Hat:jboss_enterprise_web_server:5.0::el7 | Package registry (OSV) |
| red hat:jws5-mod_cluster-tomcat | 0:1.4.0-8.Final_redhat_1.1.el7jws · Red Hat:jboss_enterprise_web_server:5.0::el7 | Package registry (OSV) |
| red hat:jws5-python-javapackages | 0:3.4.1-5.15.7.el7jws · Red Hat:jboss_enterprise_web_server:5.0::el7 | Package registry (OSV) |
| red hat:jws5-runtime | 0:1-5.el7jws · Red Hat:jboss_enterprise_web_server:5.0::el7 | Package registry (OSV) |
| red hat:jws5-tomcat | 0:9.0.7-10.redhat_10.1.el7jws · Red Hat:jboss_enterprise_web_server:5.0::el7 | Package registry (OSV) |
| red hat:jws5-tomcat-admin-webapps | 0:9.0.7-10.redhat_10.1.el7jws · Red Hat:jboss_enterprise_web_server:5.0::el7 | Package registry (OSV) |
| red hat:jws5-tomcat-docs-webapp | 0:9.0.7-10.redhat_10.1.el7jws · Red Hat:jboss_enterprise_web_server:5.0::el7 | Package registry (OSV) |
| red hat:jws5-tomcat-el-3.0-api | 0:9.0.7-10.redhat_10.1.el7jws · Red Hat:jboss_enterprise_web_server:5.0::el7 | Package registry (OSV) |
| suse:tomcat | 8.0.53-29.13.1 · SUSE:Linux Enterprise Server 12 SP3 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
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.
No dated events beyond publication.
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-18-095 · Jul 23, 2018(Apache, Tomcat için Güvenlik Güncellemeleri Yayınladı)
Not on record for this CVE: EPSS history · 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.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- www.securityfocus.com/bid/104898
- www.securitytracker.com/id/1041375
- access.redhat.com/errata/RHEA-2018:2188
- access.redhat.com/errata/RHEA-2018:2189
- access.redhat.com/errata/RHSA-2018:2700
- access.redhat.com/errata/RHSA-2018:2701
- access.redhat.com/errata/RHSA-2018:2740
- access.redhat.com/errata/RHSA-2018:2741
- access.redhat.com/errata/RHSA-2018:2742
- access.redhat.com/errata/RHSA-2018:2743
- access.redhat.com/errata/RHSA-2018:2921
- access.redhat.com/errata/RHSA-2018:2930
- access.redhat.com/errata/RHSA-2018:2939
- access.redhat.com/errata/RHSA-2018:2945
- access.redhat.com/errata/RHSA-2018:3768
- lists.apache.org/thread.html/1dd0a59c1295cc08ce4c9e7edae5ad2268acc9ba55adcefa0532e5ba%40%3Cdev.tomcat.apache.org%3E
- lists.apache.org/thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551%40%3Cdev.tomcat.apache.org%3E
- lists.apache.org/thread.html/388a323769f1dff84c9ec905455aa73fbcb20338e3c7eb131457f708%40%3Cdev.tomcat.apache.org%3E
- lists.apache.org/thread.html/3d19773b4cf0377db62d1e9328bf9160bf1819f04f988315086931d7%40%3Cdev.tomcat.apache.org%3E
Vendor advisories and official records. Exploit/PoC links are deliberately left out.