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 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: 2018-08-02 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-1336 is rated High Risk (65.2/100): CVSS High severity, with high exploitation likelihood (EPSS 20.60%, 97th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +1.17% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-1336

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 19.43% 20.60% +1.17%
2 2026-05-31 18.55% 19.43% +0.88%
3 2026-03-28 — 18.55% —

Full EPSS history (54 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-1336

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2018-1336

GitHub Security Advisory for CVE-2018-1336

GHSA-m59c-jpc8-m2x4 · Severity: high · Ecosystem: maven — In Apache Tomcat there is an improper handing of overflow in the UTF-8 decoder

OS Trackers for CVE-2018-1336

vendor priority summary link
debian unimportant CVE-2018-1336 unimportant priority: Debian including 1 source packages (tomcat9), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2018-1336
redhat high — https://access.redhat.com/security/cve/CVE-2018-1336
suse medium CVE-2018-1336 severity moderate: SUSE including 365 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 493 product×package rows across 34 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 6, … (34 product lines)): Known Affected 231, Fixed 162, Known Not Affected 100. https://www.suse.com/security/cve/CVE-2018-1336/
ubuntu medium CVE-2018-1336 medium priority: Ubuntu including 3 source packages (tomcat7, tomcat8, tomcat8.0), 36 status rows across 12 suites (bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, trusty, upstream, xenial): DNE 26, released 7, not-affected 3. https://ubuntu.com/security/CVE-2018-1336

Affected software / configurations for CVE-2018-1336

Vendor Product Version Raw CPE
apache tomcat >= 7.0.28, <= 7.0.86 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat >= 8.0.0, <= 8.0.51 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat >= 8.5.0, <= 8.5.30 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat >= 9.0.1, <= 9.0.7 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat 8.0.0 cpe:2.3:a:apache:tomcat:8.0.0:rc1:*:*:*:*:*:*
apache tomcat 8.0.0 cpe:2.3:a:apache:tomcat:8.0.0:rc10:*:*:*:*:*:*
apache tomcat 8.0.0 cpe:2.3:a:apache:tomcat:8.0.0:rc2:*:*:*:*:*:*
apache tomcat 8.0.0 cpe:2.3:a:apache:tomcat:8.0.0:rc3:*:*:*:*:*:*
apache tomcat 8.0.0 cpe:2.3:a:apache:tomcat:8.0.0:rc4:*:*:*:*:*:*
apache tomcat 8.0.0 cpe:2.3:a:apache:tomcat:8.0.0:rc5:*:*:*:*:*:*
apache tomcat 8.0.0 cpe:2.3:a:apache:tomcat:8.0.0:rc6:*:*:*:*:*:*
apache tomcat 8.0.0 cpe:2.3:a:apache:tomcat:8.0.0:rc7:*:*:*:*:*:*
apache tomcat 8.0.0 cpe:2.3:a:apache:tomcat:8.0.0:rc8:*:*:*:*:*:*
apache tomcat 8.0.0 cpe:2.3:a:apache:tomcat:8.0.0:rc9:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone10:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone11:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone12:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone13:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone14:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone15:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone16:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone17:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone18:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone19:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone20:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone21:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone22:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone23:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone24:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone25:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone26:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone27:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone9:*:*:*:*:*:*
redhat jboss_enterprise_application_platform 6.0.0 cpe:2.3:a:redhat:jboss_enterprise_application_platform:6.0.0:*:*:*:*:*:*:*
redhat jboss_enterprise_application_platform 6.4.0 cpe:2.3:a:redhat:jboss_enterprise_application_platform:6.4.0:*:*:*:*:*:*:*
canonical ubuntu_linux 14.04 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
redhat jboss_enterprise_web_server 3.0.0 cpe:2.3:a:redhat:jboss_enterprise_web_server:3.0.0:*:*:*:*:*:*:*
redhat jboss_enterprise_web_server 5.0.0 cpe:2.3:a:redhat:jboss_enterprise_web_server:5.0.0:*:*:*:*:*:*:*
redhat enterprise_linux_desktop 7.0 cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_server 7.0 cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 7.0 cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*

References for CVE-2018-1336

URL Tags
http://mail-archives.us.apache.org/mod_mbox/www-announce/201807.mbox/%3C20180722090435.GA60759%40minotaur.apache.org%3E Mailing List Vendor Advisory
http://www.securityfocus.com/bid/104898 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1041375 Third Party Advisory VDB Entry
https://access.redhat.com/errata/RHEA-2018:2188 Third Party Advisory
https://access.redhat.com/errata/RHEA-2018:2189 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2700 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2701 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2740 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2741 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2742 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2743 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2921 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2930 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2939 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2945 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3768 Third Party Advisory
https://lists.apache.org/thread.html/1dd0a59c1295cc08ce4c9e7edae5ad2268acc9ba55adcefa0532e5ba%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/388a323769f1dff84c9ec905455aa73fbcb20338e3c7eb131457f708%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/3d19773b4cf0377db62d1e9328bf9160bf1819f04f988315086931d7%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/5c0e00fd31efc11e147bf99d0f03c00a734447d3b131ab0818644cdb%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/6af47120905aa7d8fe12f42e8ff2284fb338ba141d3b77b8c7cb61b3%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/845312a10aabbe2c499fca94003881d2c79fc993d85f34c1f5c77424%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/88855876c33f2f9c532ffb75bfee570ccf0b17ffa77493745af9a17a%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/b5e3f51d28cd5d9b1809f56594f2cf63dcd6a90429e16ea9f83bbedc%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/e85e83e9954f169bbb77b44baae5a33d8de878df557bb32b7f793661%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/eb6efa8d59c45a7a9eff94c4b925467d3b3fec8ba7697f3daa314b04%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/r3bbb800a816d0a51eccc5a228c58736960a9fffafa581a225834d97d%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/r48c1444845fe15a823e1374674bfc297d5008a5453788099ea14caf0%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/r6ccee4e849bc77df0840c7f853f6bd09d426f6741247da2b7429d5d9%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/r9136ff5b13e4f1941360b5a309efee2c114a14855578c3a2cbe5d19c%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/raba0fabaf4d56d4325ab2aca8814f0b30a237ab83d8106b115ee279a%40%3Cdev.tomcat.apache.org%3E
https://lists.debian.org/debian-lts-announce/2018/09/msg00001.html Third Party Advisory
https://security.netapp.com/advisory/ntap-20180817-0001/ Third Party Advisory
https://support.f5.com/csp/article/K73008537?utm_source=f5support&amp%3Butm_medium=RSS
https://usn.ubuntu.com/3723-1/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4281 Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2020.html
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