// For flags

CVE-2020-27782

undertow: special character in query results in server errors

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

A flaw was found in the Undertow AJP connector. Malicious requests and abrupt connection closes could be triggered by an attacker using query strings with non-RFC compliant characters resulting in a denial of service. The highest threat from this vulnerability is to system availability. This affects Undertow 2.1.5.SP1, 2.0.33.SP2, and 2.2.3.SP1.

Se encontró un fallo en el conector AJP de Undertow. Peticiones maliciosas y cierres de conexiones abruptas podrían ser desencadenadas por un atacante usando cadenas de consulta con caracteres que no cumplen con RFC, resultando en una denegación de servicio. La mayor amenaza de esta vulnerabilidad es la disponibilidad del sistema. Esto afecta a Undertow versiones 2.1.5.SP1, 2.0.33.SP2 y 2.2.3.SP1

A flaw was found in the Undertow AJP connector. Malicious requests and abrupt connection closes could be triggered by an attacker using query strings with non-RFC compliant characters resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Red Hat JBoss Enterprise Application Platform 7 is a platform for Java applications based on the WildFly application runtime. This release of Red Hat JBoss Enterprise Application Platform 7.3.5 serves as a replacement for Red Hat JBoss Enterprise Application Platform 7.3.4, and includes bug fixes and enhancements. See the Red Hat JBoss Enterprise Application Platform 7.3.5 Release Notes for information about the most significant bug fixes and enhancements included in this release. Issues addressed include information leakage and memory leak vulnerabilities.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-10-27 CVE Reserved
  • 2021-01-25 CVE Published
  • 2024-08-04 CVE Updated
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-400: Uncontrolled Resource Consumption
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Redhat
Search vendor "Redhat"
 Jboss Fuse
Search vendor "Redhat" for product "Jboss Fuse"
 6.0.0
Search vendor "Redhat" for product "Jboss Fuse" and version "6.0.0"
-
Affected
Redhat
Search vendor "Redhat"
 Jboss Fuse
Search vendor "Redhat" for product "Jboss Fuse"
 7.0.0
Search vendor "Redhat" for product "Jboss Fuse" and version "7.0.0"
-
Affected
Redhat
Search vendor "Redhat"
 Openshift Application Runtimes
Search vendor "Redhat" for product "Openshift Application Runtimes"
--
Affected
Redhat
Search vendor "Redhat"
 Undertow
Search vendor "Redhat" for product "Undertow"
 2.0.33
Search vendor "Redhat" for product "Undertow" and version "2.0.33"
sp2
Affected
Redhat
Search vendor "Redhat"
 Undertow
Search vendor "Redhat" for product "Undertow"
 2.1.5
Search vendor "Redhat" for product "Undertow" and version "2.1.5"
sp1
Affected
Redhat
Search vendor "Redhat"
 Undertow
Search vendor "Redhat" for product "Undertow"
 2.2.3
Search vendor "Redhat" for product "Undertow" and version "2.2.3"
sp1
Affected