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NVD / CVE Program· CNA redhat

CVE-2020-1757: 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 un

Noroxi assessment

Priority: Monitor (action score 32/100)

  • 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: 1.6% (FIRST EPSS); higher than 76.1% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: undertow (Debian:14) 2.1.0-1; io.undertow:undertow-core (Maven) 2.1.0; eap7-apache-commons-beanutils (Red Hat:jboss_enterprise_application_platform_eus:7.1::el7) 0:1.9.4-1.redhat_00002.1.ep7.el7.

Low priority for now. Upgrade to undertow (Debian:14) 2.1.0-1; io.undertow:undertow-core (Maven) 2.1.0; eap7-apache-commons-beanutils (Red Hat:jboss_enterprise_application_platform_eus:7.1::el7) 0:1.9.4-1.redhat_00002.1.ep7.el7 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

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.

HighCVSS 8.1 · v3.1—No exploit Fix available
Published
Apr 21, 2020
Updated
Jun 16, 2026
EPSS
1.6% · 76th percentile

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.6%

CNA vs NVD score

NVD
8.1
CNA · redhat
8.1
agree

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi 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.

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Affected 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.

VendorProduct
redhatundertow
redhatjboss data grid
redhatjboss enterprise application platform
redhatjboss fuse
redhatopenshift application runtimes
redhatsingle sign-on

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • redhat jboss data grid7.0.0
  • redhat jboss enterprise application platform7.0.0
  • redhat jboss fuse6.0.0
  • redhat jboss fuse7.0.0
  • redhat openshift application runtimesall versions
  • redhat single sign-on7.0
  • redhat undertowbefore 2.1.0
  • redhat undertow2.0.0
  • redhat undertow2.0.25
  • redhat undertow2.0.26
  • redhat undertow2.0.28

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat undertow

    • 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.Finalaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:14undertowbefore 2.1.0-12.1.0-1
Mavenio.undertow:undertow-corebefore 2.1.02.1.0
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-apache-commons-beanutilsbefore 0:1.9.4-1.redhat_00002.1.ep7.el70:1.9.4-1.redhat_00002.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-infinispanbefore 0:8.2.11-1.SP2_redhat_00001.1.ep7.el70:8.2.11-1.SP2_redhat_00001.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-infinispan-cachestore-jdbcbefore 0:8.2.11-1.SP2_redhat_00001.1.ep7.el70:8.2.11-1.SP2_redhat_00001.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-infinispan-cachestore-remotebefore 0:8.2.11-1.SP2_redhat_00001.1.ep7.el70:8.2.11-1.SP2_redhat_00001.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-infinispan-client-hotrodbefore 0:8.2.11-1.SP2_redhat_00001.1.ep7.el70:8.2.11-1.SP2_redhat_00001.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-infinispan-commonsbefore 0:8.2.11-1.SP2_redhat_00001.1.ep7.el70:8.2.11-1.SP2_redhat_00001.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-infinispan-corebefore 0:8.2.11-1.SP2_redhat_00001.1.ep7.el70:8.2.11-1.SP2_redhat_00001.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-jackson-databindbefore 0:2.8.11.5-1.redhat_00001.1.ep7.el70:2.8.11.5-1.redhat_00001.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-log4j-jboss-logmanagerbefore 0:1.2.2-1.Final_redhat_00002.1.ep7.el70:1.2.2-1.Final_redhat_00002.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-nettybefore 0:4.1.45-1.Final_redhat_00001.1.ep7.el70:4.1.45-1.Final_redhat_00001.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-netty-allbefore 0:4.1.45-1.Final_redhat_00001.1.ep7.el70:4.1.45-1.Final_redhat_00001.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-undertowbefore 0:1.4.18-12.SP12_redhat_00001.1.ep7.el70:1.4.18-12.SP12_redhat_00001.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-wildflybefore 0:7.1.7-2.GA_redhat_00002.1.ep7.el70:7.1.7-2.GA_redhat_00002.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-wildfly-elytronbefore 0:1.1.13-1.Final_redhat_00001.1.ep7.el70:1.1.13-1.Final_redhat_00001.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-wildfly-modulesbefore 0:7.1.7-2.GA_redhat_00002.1.ep7.el70:7.1.7-2.GA_redhat_00002.1.ep7.el7
Red Hat:jboss_enterprise_application_platform:7.2::el6eap7-activemq-artemisbefore 0:2.9.0-4.redhat_00010.1.el6eap0:2.9.0-4.redhat_00010.1.el6eap
Red Hat:jboss_enterprise_application_platform:7.2::el6eap7-activemq-artemis-clibefore 0:2.9.0-4.redhat_00010.1.el6eap0:2.9.0-4.redhat_00010.1.el6eap
Red Hat:jboss_enterprise_application_platform:7.2::el6eap7-activemq-artemis-commonsbefore 0:2.9.0-4.redhat_00010.1.el6eap0:2.9.0-4.redhat_00010.1.el6eap
Red Hat:jboss_enterprise_application_platform:7.2::el6eap7-activemq-artemis-core-clientbefore 0:2.9.0-4.redhat_00010.1.el6eap0:2.9.0-4.redhat_00010.1.el6eap
Red Hat:jboss_enterprise_application_platform:7.2::el6eap7-activemq-artemis-dtobefore 0:2.9.0-4.redhat_00010.1.el6eap0:2.9.0-4.redhat_00010.1.el6eap
Red Hat:jboss_enterprise_application_platform:7.2::el6eap7-activemq-artemis-hornetq-protocolbefore 0:2.9.0-4.redhat_00010.1.el6eap0:2.9.0-4.redhat_00010.1.el6eap
Red Hat:jboss_enterprise_application_platform:7.2::el6eap7-activemq-artemis-hqclient-protocolbefore 0:2.9.0-4.redhat_00010.1.el6eap0:2.9.0-4.redhat_00010.1.el6eap

+96

Same product

redhat: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-1745A file inclusion vulnerability was found in the AJP connector enabled with a default AJP configuration port of 8009 in Undertow version 2.0.
    40Plan
  • CVE-2019-10212A flaw was found in, all under 2.0.20, in the Undertow DEBUG log for io.undertow.request.security.
    40Plan
  • CVE-2019-3888A vulnerability was found in Undertow web server before 2.0.21.
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2019-10184Jul 25, 2019 · undertow before version 2.0.23.Final is vulnerable to an information leak issue.
    31Monitor
  • ← EarlierCVE-2019-14888Jan 23, 2020 · A vulnerability was found in the Undertow HTTP server in versions before 2.0.28.SP1 when listening on HTTPS.
    31Monitor
  • Later →CVE-2020-10719May 26, 2020 · A flaw was found in Undertow in versions before 2.1.1.Final, regarding the processing of invalid HTTP requests with large chunk sizes.
    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 / packageFixed versionSource
debian:undertow2.1.0-1 · Debian:14Package registry (OSV)
Maven:io.undertow:undertow-core2.1.0Package registry (OSV)
red hat:eap7-activemq-artemis0:2.9.0-4.redhat_00010.1.el6eap · Red Hat:jboss_enterprise_application_platform:7.2::el6Package registry (OSV)
red hat:eap7-activemq-artemis-cli0:2.9.0-4.redhat_00010.1.el6eap · Red Hat:jboss_enterprise_application_platform:7.2::el6Package registry (OSV)
red hat:eap7-activemq-artemis-commons0:2.9.0-4.redhat_00010.1.el6eap · Red Hat:jboss_enterprise_application_platform:7.2::el6Package registry (OSV)
red hat:eap7-activemq-artemis-core-client0:2.9.0-4.redhat_00010.1.el6eap · Red Hat:jboss_enterprise_application_platform:7.2::el6Package registry (OSV)
red hat:eap7-activemq-artemis-dto0:2.9.0-4.redhat_00010.1.el6eap · Red Hat:jboss_enterprise_application_platform:7.2::el6Package registry (OSV)
red hat:eap7-activemq-artemis-hornetq-protocol0:2.9.0-4.redhat_00010.1.el6eap · Red Hat:jboss_enterprise_application_platform:7.2::el6Package registry (OSV)
red hat:eap7-activemq-artemis-hqclient-protocol0:2.9.0-4.redhat_00010.1.el6eap · Red Hat:jboss_enterprise_application_platform:7.2::el6Package registry (OSV)
red hat:eap7-activemq-artemis-jdbc-store0:2.9.0-4.redhat_00010.1.el6eap · Red Hat:jboss_enterprise_application_platform:7.2::el6Package registry (OSV)
red hat:eap7-activemq-artemis-jms-client0:2.9.0-4.redhat_00010.1.el6eap · Red Hat:jboss_enterprise_application_platform:7.2::el6Package registry (OSV)
red hat:eap7-activemq-artemis-jms-server0:2.9.0-4.redhat_00010.1.el6eap · Red Hat:jboss_enterprise_application_platform:7.2::el6Package registry (OSV)
red hat:eap7-activemq-artemis-journal0:2.9.0-4.redhat_00010.1.el6eap · Red Hat:jboss_enterprise_application_platform:7.2::el6Package registry (OSV)
red hat:eap7-activemq-artemis-ra0:2.9.0-4.redhat_00010.1.el6eap · Red Hat:jboss_enterprise_application_platform:7.2::el6Package 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.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-20 · Improper Input Validation

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

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.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records