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Fencer Vulns
high 8.1

CVE-2020-1757 json

Improper Input Validation in Undertow

published 2020-04-21 6 y ago modified 2026-06-17 4 mo ago also GHSA-2w73-fqqj-c92p , EUVD-2022-2061

cvss
8.1
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 76%
public exploits
0
none known

Summary

A flaw was found in all undertow-2.x.x SP1 versions prior to undertow-2.0.30.SP1, all undertow-1.x.x and undertow-2.x.x versions prior to undertow-2.1.0.Final, where the Servlet container causes servletPath to normalize incorrectly by truncating the path after semicolon which may lead to an application mapping resulting in the security bypass.

Patch / fix

  • maven io.undertow:undertow-core 2.1.0
  • redhat undertow 2.1.0
  • undertow Debian 14 2.1.0-1

debian advisories DEBIAN-CVE-2020-1757

  • eap7-txw2 jboss enterprise application platform 7.3 2.3.3-4.b02_redhat_00001.1.el7eap
  • eap7-xsom jboss enterprise application platform 7.3 2.3.3-4.b02_redhat_00001.1.el7eap
  • eap7-rngom jboss enterprise application platform 7.3 2.3.3-4.b02_redhat_00001.1.el7eap
  • eap7-wss4j jboss enterprise application platform 7.3, jboss enterprise application platform 7.2 2.2.5-1.redhat_00001.1.el7eap
  • eap7-jandex jboss enterprise application platform 7.3 2.1.2-1.Final_redhat_00001.1.el7eap
  • eap7-jasypt jboss enterprise application platform 7.3, jboss enterprise application platform 7.2 1.9.3-1.redhat_00001.1.el7eap
  • eap7-wildfly jboss enterprise application platform 7.3 7.3.1-5.GA_redhat_00003.1.el7eap
  • eap7-jaxb-jxc jboss enterprise application platform 7.3 2.3.3-4.b02_redhat_00001.1.el7eap

red hat advisories RHSA-2024:5856RHSA-2020:2512RHSA-2020:2511RHSA-2020:2513RHSA-2020:2060RHSA-2020:2059

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-1757 updated cvss 8.1

undertow: servletPath is normalized incorrectly leading to dangerous application mapping which could result in security bypass

  • Red Hat JBoss Enterprise Application Platform 6 undertow undertow
    affected: workaround, no fix planned “The issue can be mitigated by configuring UrlPathHelper to ignore the servletPath via setting "alwaysUseFullPath".”
  • Red Hat JBoss Fuse 6 undertow undertow Red Hat OpenShift Application Runtimes undertow undertow
    affected: workaround, no fix available “The issue can be mitigated by configuring UrlPathHelper to ignore the servletPath via setting "alwaysUseFullPath".”
  • Red Hat Data Grid 7.3.7
    fixed: vendor fix “The issue can be mitigated by configuring UrlPathHelper to ignore the servletPath via setting "alwaysUseFullPath".” RHSA-2020:3779
  • Red Hat Fuse 7.7.0
    fixed: vendor fix “The issue can be mitigated by configuring UrlPathHelper to ignore the servletPath via setting "alwaysUseFullPath".” RHSA-2020:3192
  • Red Hat JBoss EAP 7.2
    fixed: vendor fix “The issue can be mitigated by configuring UrlPathHelper to ignore the servletPath via setting "alwaysUseFullPath".” RHSA-2020:2061
  • Red Hat JBoss EAP 7.2 for RHEL 6 Server eap7-wss4j 2.2.5-1.redhat_00001.1.el6eap, eap7-jasypt 1.9.3-1.redhat_00001.1.el6eap, eap7-opensaml 3.3.1-1.redhat_00002.1.el6eap, eap7-wildfly 7.2.8-3.GA_redhat_00002.1.el6eap, eap7-apache-cxf 3.2.12-1.redhat_00001.1.el6eap, eap7-cryptacular 1.2.4-1.redhat_00001.1.el6eap, +152 more
    fixed: vendor fix “The issue can be mitigated by configuring UrlPathHelper to ignore the servletPath via setting "alwaysUseFullPath".” RHSA-2020:2058
  • Red Hat JBoss EAP 7.2 for RHEL 7 Server eap7-wss4j 2.2.5-1.redhat_00001.1.el7eap, eap7-jasypt 1.9.3-1.redhat_00001.1.el7eap, eap7-opensaml 3.3.1-1.redhat_00002.1.el7eap, eap7-wildfly 7.2.8-3.GA_redhat_00002.1.el7eap, eap7-apache-cxf 3.2.12-1.redhat_00001.1.el7eap, eap7-cryptacular 1.2.4-1.redhat_00001.1.el7eap, +154 more
    fixed: vendor fix “The issue can be mitigated by configuring UrlPathHelper to ignore the servletPath via setting "alwaysUseFullPath".” RHSA-2020:2059
  • Red Hat JBoss EAP 7.2 for RHEL 8 eap7-wss4j 2.2.5-1.redhat_00001.1.el8eap, eap7-jasypt 1.9.3-1.redhat_00001.1.el8eap, eap7-opensaml 3.3.1-1.redhat_00002.1.el8eap, eap7-wildfly 7.2.8-3.GA_redhat_00002.1.el8eap, eap7-apache-cxf 3.2.12-1.redhat_00001.1.el8eap, eap7-cryptacular 1.2.4-1.redhat_00001.1.el8eap, +152 more
    fixed: vendor fix “The issue can be mitigated by configuring UrlPathHelper to ignore the servletPath via setting "alwaysUseFullPath".” RHSA-2020:2060
show 8 more
  • Red Hat JBoss EAP 7.3 for BaseOS-8 eap7-wss4j 2.2.5-1.redhat_00001.1.el8eap, eap7-jasypt 1.9.3-1.redhat_00001.1.el8eap, eap7-opensaml 3.3.1-1.redhat_00002.1.el8eap, eap7-txw2 2.3.3-4.b02_redhat_00001.1.el8eap, eap7-xsom 2.3.3-4.b02_redhat_00001.1.el8eap, eap7-rngom 2.3.3-4.b02_redhat_00001.1.el8eap, +194 more
    fixed: vendor fix “The issue can be mitigated by configuring UrlPathHelper to ignore the servletPath via setting "alwaysUseFullPath".” RHSA-2020:2513
  • Red Hat JBoss EAP 7.3 for RHEL 6 Server eap7-wss4j 2.2.5-1.redhat_00001.1.el6eap, eap7-jasypt 1.9.3-1.redhat_00001.1.el6eap, eap7-opensaml 3.3.1-1.redhat_00002.1.el6eap, eap7-txw2 2.3.3-4.b02_redhat_00001.1.el6eap, eap7-xsom 2.3.3-4.b02_redhat_00001.1.el6eap, eap7-rngom 2.3.3-4.b02_redhat_00001.1.el6eap, +194 more
    fixed: vendor fix “The issue can be mitigated by configuring UrlPathHelper to ignore the servletPath via setting "alwaysUseFullPath".” RHSA-2020:2511
  • Red Hat JBoss EAP 7.3 for RHEL 7 Server eap7-wss4j 2.2.5-1.redhat_00001.1.el7eap, eap7-jasypt 1.9.3-1.redhat_00001.1.el7eap, eap7-opensaml 3.3.1-1.redhat_00002.1.el7eap, eap7-txw2 2.3.3-4.b02_redhat_00001.1.el7eap, eap7-xsom 2.3.3-4.b02_redhat_00001.1.el7eap, eap7-rngom 2.3.3-4.b02_redhat_00001.1.el7eap, +196 more
    fixed: vendor fix “The issue can be mitigated by configuring UrlPathHelper to ignore the servletPath via setting "alwaysUseFullPath".” RHSA-2020:2512
  • Red Hat JBoss Enterprise Application Platform 7
    fixed: vendor fix “The issue can be mitigated by configuring UrlPathHelper to ignore the servletPath via setting "alwaysUseFullPath".” RHSA-2020:2515
  • Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 Server eap7-undertow 1.4.18-12.SP12_redhat_00001.1.ep7.el7
    fixed: vendor fix “The issue can be mitigated by configuring UrlPathHelper to ignore the servletPath via setting "alwaysUseFullPath".” RHSA-2024:5856
  • Red Hat Single Sign On 7.3.8
    fixed: vendor fix “The issue can be mitigated by configuring UrlPathHelper to ignore the servletPath via setting "alwaysUseFullPath".” RHSA-2020:2112
  • Red Hat Text-Only RHOAR
    fixed: vendor fix “The issue can be mitigated by configuring UrlPathHelper to ignore the servletPath via setting "alwaysUseFullPath".” RHSA-2020:2905
  • Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 Server eap7-wildfly 7.1.7-2.GA_redhat_00002.1.ep7.el7, eap7-netty 4.1.45-1.Final_redhat_00001.1.ep7.el7, eap7-infinispan 8.2.11-1.SP2_redhat_00001.1.ep7.el7, eap7-netty-all 4.1.45-1.Final_redhat_00001.1.ep7.el7, eap7-wildfly-modules 7.1.7-2.GA_redhat_00002.1.ep7.el7, eap7-jackson-databind 2.8.11.5-1.redhat_00001.1.ep7.el7, +8 more Red Hat Process Automation 7 undertow undertow
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.62% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 8.1 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD 2.0 5.5 AV:N/AC:L/Au:S/C:P/I:P/A:N
GitHub 3.0 8.1 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
maven io.undertow:undertow-core
<2.1.0
2.1.0

Affected products

  • Red Hat undertow

Classification

Weakness
  • CWE-20 Improper Input Validation
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.