What is the CVSS score of CVE-2020-1757?

CVE-2020-1757 has a CVSS 3.1 base score of 8.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N. EPSS exploitation probability: 1.6%.

Is there a patch available for CVE-2020-1757?

Yes, a patch is available for CVE-2020-1757. Update the affected software to the latest version immediately.

Undertow CVE-2020-1757

HIGH

Improper Input Validation (CWE-20)

2020-04-21 secalert@redhat.com

Authentication Bypass Red Hat Jboss Enterprise Application Platform Single Sign On Undertow Jboss Fuse Jboss Data Grid Openshift Application Runtimes

8.1

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-20 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V2 - Validation and Business Logic Input validation, allowlisting
Impact	CVSS score of 8.1 (HIGH). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 1.6% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAI

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. Rated high severity (CVSS 8.1), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affected Packages

maven io.undertow:undertow-core fix: 2.1.0

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in maven

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-20. 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. Affected products include: Redhat Undertow, Redhat Jboss Data Grid, Redhat Jboss Enterprise Application Platform, Redhat Jboss Fuse, Redhat Openshift Application Runtimes.

Know when Undertow gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 8.1 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

DescriptionNVD

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.

Threat Intelligence Overview

EPSS Score

1.6%

Top 27% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 1.6%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +2

CVSS: +40

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)NVD

cpe:2.3:a:redhat:undertow:*:*:*:*:*:*:*:*

cpe:2.3:a:redhat:undertow:2.0.0:sp1:*:*:*:*:*:*

cpe:2.3:a:redhat:undertow:2.0.25:sp1:*:*:*:*:*:*

cpe:2.3:a:redhat:undertow:2.0.26:sp3:*:*:*:*:*:*

cpe:2.3:a:redhat:undertow:2.0.28:sp1:*:*:*:*:*:*

cpe:2.3:a:redhat:undertow:2.0.28:sp2:*:*:*:*:*:*

cpe:2.3:a:redhat:jboss_data_grid:7.0.0:*:*:*:*:*:*:*

cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.0.0:*:*:*:*:*:*:*

cpe:2.3:a:redhat:jboss_fuse:6.0.0:*:*:*:*:*:*:*

cpe:2.3:a:redhat:jboss_fuse:7.0.0:*:*:*:*:*:*:*

cpe:2.3:a:redhat:openshift_application_runtimes:-:*:*:*:*:*:*:*

cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:*

More in Undertow

View all

CVE-2014-7816 MEDIUM This Month POC

5.0 Dec 01

Directory traversal vulnerability in JBoss Undertow 1.0.x before 1.0.17, 1.1.x before 1.1.0.CR5, and 1.2.x before 1.2.0.

CVE-2020-1745 CRITICAL Act Now

9.8 Apr 28

A file inclusion vulnerability was found in the AJP connector enabled with a default AJP configuration port of 8009 in U

CVE-2019-10212 CRITICAL Act Now

9.8 Oct 02

A flaw was found in, all under 2.0.20, in the Undertow DEBUG log for io.undertow.request.security. Rated critical severi

CVE-2019-3888 CRITICAL Act Now

9.8 Jun 12

A vulnerability was found in Undertow web server before 2.0.21. Rated critical severity (CVSS 9.8), this vulnerability i

CVE-2025-12543 CRITICAL Act Now

9.6 Jan 07

Undertow HTTP server (used in WildFly, JBoss EAP) fails to validate Host headers, enabling cache poisoning, internal net

CVE-2025-9784 HIGH This Week

7.5 Sep 02

Undertow, a Java web server used across Red Hat's JBoss Enterprise Application Platform, Fuse, and other middleware prod

CVE-2023-5379 HIGH This Week

7.5 Dec 12

A flaw was found in Undertow. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authenticat

CVE-2023-3223 HIGH This Week

7.5 Sep 27

A flaw was found in undertow. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authenticat

CVE-2023-1108 HIGH This Week

7.5 Sep 14

A flaw was found in undertow. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authenticat

CVE-2022-1319 HIGH This Week

7.5 Aug 31

A flaw was found in Undertow. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authenticat

CVE-2022-1259 HIGH This Week

7.5 Aug 31

A flaw was found in Undertow. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authenticat

CVE-2022-2053 HIGH This Week

7.5 Aug 05

When a POST request comes through AJP and the request exceeds the max-post-size limit (maxEntitySize), Undertow's AjpSer

Same weakness CWE-20 – Improper Input Validation

View all

CVE-2021-44228 CRITICAL POC

10.0

CVE-2024-3400 CRITICAL POC

10.0

CVE-2022-47966 CRITICAL POC

9.8

CVE-2023-22515 CRITICAL POC

9.8

CVE-2009-0927 HIGH POC

8.8

CVE-2017-9791 CRITICAL POC

9.8

CVE-2017-15944 CRITICAL POC

9.8

CVE-2019-0604 CRITICAL POC

9.8

Same technique Authentication Bypass

View all

CVE-2015-3306 CRITICAL POC

10.0

CVE-2012-4681 CRITICAL POC

9.8

CVE-2013-2465 CRITICAL POC

9.8

CVE-2011-3544 CRITICAL POC

9.8

CVE-2022-40684 CRITICAL POC

9.8

CVE-2025-61882 CRITICAL POC

9.8

CVE-2024-0012 CRITICAL POC

9.3

References

Advisories & patches

ADVISORY https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1757

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

Back