// For flags

CVE-2020-1935

tomcat: Mishandling of Transfer-Encoding header allows for HTTP request smuggling

Severity Score

4.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.

En Apache Tomcat versiones 9.0.0.M1 hasta 9.0.30, versiones 8.5.0 hasta 8.5.50 y versiones 7.0.0 hasta 7.0.99, el código de análisis del encabezado HTTP utilizó un enfoque para el análisis de fin de línea que permitió a algunos encabezados HTTP no válidos ser analizados como válidos. Esto conllevó a una posibilidad de Tráfico No Autorizado de Peticiones HTTP si Tomcat se encontraba detrás de un proxy inverso que manejaba incorrectamente el encabezado Transfer-Encoding no válido en una manera particular. Tal proxy inverso es considerado improbable.

A flaw was found in Apache Tomcat. The HTTP header parsing code used an approach to end-of-line (EOL) parsing that allowed some invalid HTTP headers to be parsed as valid. This led to the possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. The highest threat with this vulnerability is system availability.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Attack Vector
Network
Attack Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2019-12-02 CVE Reserved
  • 2020-02-24 CVE Published
  • 2024-01-31 EPSS Updated
  • 2024-08-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CAPEC
References (21)
URL Tag Source
https://lists.apache.org/thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75%40%3Cusers.tomcat.apache.org%3E Mailing List
https://lists.apache.org/thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919%40%3Cusers.tomcat.apache.org%3E Mailing List
https://lists.apache.org/thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78%40%3Ccommits.tomee.apache.org%3E Mailing List
https://lists.apache.org/thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1%40%3Cusers.tomcat.apache.org%3E Mailing List
https://lists.apache.org/thread.html/r9ce7918faf347e7aac32be930bf26c233b0b140fe37af0bb294158b6%40%3Cdev.tomcat.apache.org%3E Mailing List
https://lists.apache.org/thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7%40%3Cusers.tomcat.apache.org%3E Mailing List
https://lists.apache.org/thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743%40%3Ccommits.tomee.apache.org%3E Mailing List
https://lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18%40%3Cusers.tomcat.apache.org%3E Mailing List
https://lists.debian.org/debian-lts-announce/2020/03/msg00006.html Mailing List
https://lists.debian.org/debian-lts-announce/2020/05/msg00026.html Mailing List
https://security.netapp.com/advisory/ntap-20200327-0005 Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2021.html Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2020.html Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2020.html Third Party Advisory
URL Date SRC
URL Date SRC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
>= 7.0.0 <= 7.0.99
Search vendor "Apache" for product "Tomcat" and version " >= 7.0.0 <= 7.0.99"
-
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
>= 8.5.0 <= 8.5.50
Search vendor "Apache" for product "Tomcat" and version " >= 8.5.0 <= 8.5.50"
-
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
>= 9.0.0 <= 9.0.30
Search vendor "Apache" for product "Tomcat" and version " >= 9.0.0 <= 9.0.30"
-
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
-
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone1
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone10
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone11
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone12
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone13
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone14
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone15
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone16
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone17
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone18
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone19
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone2
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone20
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone21
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone22
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone23
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone24
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone25
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone26
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone27
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone3
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone4
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone5
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone6
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone7
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone8
Affected
Apache
Search vendor "Apache"
Tomcat
Search vendor "Apache" for product "Tomcat"
9.0.0
Search vendor "Apache" for product "Tomcat" and version "9.0.0"
milestone9
Affected
Debian
Search vendor "Debian"
Debian Linux
Search vendor "Debian" for product "Debian Linux"
8.0
Search vendor "Debian" for product "Debian Linux" and version "8.0"
-
Affected
Debian
Search vendor "Debian"
Debian Linux
Search vendor "Debian" for product "Debian Linux"
9.0
Search vendor "Debian" for product "Debian Linux" and version "9.0"
-
Affected
Debian
Search vendor "Debian"
Debian Linux
Search vendor "Debian" for product "Debian Linux"
10.0
Search vendor "Debian" for product "Debian Linux" and version "10.0"
-
Affected
Canonical
Search vendor "Canonical"
Ubuntu Linux
Search vendor "Canonical" for product "Ubuntu Linux"
16.04
Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"
lts
Affected
Opensuse
Search vendor "Opensuse"
Leap
Search vendor "Opensuse" for product "Leap"
15.1
Search vendor "Opensuse" for product "Leap" and version "15.1"
-
Affected
Netapp
Search vendor "Netapp"
Data Availability Services
Search vendor "Netapp" for product "Data Availability Services"
--
Affected
Netapp
Search vendor "Netapp"
Oncommand System Manager
Search vendor "Netapp" for product "Oncommand System Manager"
>= 3.0.0 <= 3.1.3
Search vendor "Netapp" for product "Oncommand System Manager" and version " >= 3.0.0 <= 3.1.3"
-
Affected
Oracle
Search vendor "Oracle"
Agile Engineering Data Management
Search vendor "Oracle" for product "Agile Engineering Data Management"
6.2.1.0
Search vendor "Oracle" for product "Agile Engineering Data Management" and version "6.2.1.0"
-
Affected
Oracle
Search vendor "Oracle"
Agile Product Lifecycle Management
Search vendor "Oracle" for product "Agile Product Lifecycle Management"
9.3.3
Search vendor "Oracle" for product "Agile Product Lifecycle Management" and version "9.3.3"
-
Affected
Oracle
Search vendor "Oracle"
Agile Product Lifecycle Management
Search vendor "Oracle" for product "Agile Product Lifecycle Management"
9.3.5
Search vendor "Oracle" for product "Agile Product Lifecycle Management" and version "9.3.5"
-
Affected
Oracle
Search vendor "Oracle"
Agile Product Lifecycle Management
Search vendor "Oracle" for product "Agile Product Lifecycle Management"
9.3.6
Search vendor "Oracle" for product "Agile Product Lifecycle Management" and version "9.3.6"
-
Affected
Oracle
Search vendor "Oracle"
Communications Element Manager
Search vendor "Oracle" for product "Communications Element Manager"
8.1.1
Search vendor "Oracle" for product "Communications Element Manager" and version "8.1.1"
-
Affected
Oracle
Search vendor "Oracle"
Communications Element Manager
Search vendor "Oracle" for product "Communications Element Manager"
8.2.0
Search vendor "Oracle" for product "Communications Element Manager" and version "8.2.0"
-
Affected
Oracle
Search vendor "Oracle"
Communications Element Manager
Search vendor "Oracle" for product "Communications Element Manager"
8.2.1
Search vendor "Oracle" for product "Communications Element Manager" and version "8.2.1"
-
Affected
Oracle
Search vendor "Oracle"
Communications Instant Messaging Server
Search vendor "Oracle" for product "Communications Instant Messaging Server"
10.0.1.4.0
Search vendor "Oracle" for product "Communications Instant Messaging Server" and version "10.0.1.4.0"
-
Affected
Oracle
Search vendor "Oracle"
Health Sciences Empirica Inspections
Search vendor "Oracle" for product "Health Sciences Empirica Inspections"
1.0.1.2
Search vendor "Oracle" for product "Health Sciences Empirica Inspections" and version "1.0.1.2"
-
Affected
Oracle
Search vendor "Oracle"
Health Sciences Empirica Signal
Search vendor "Oracle" for product "Health Sciences Empirica Signal"
7.3.3
Search vendor "Oracle" for product "Health Sciences Empirica Signal" and version "7.3.3"
-
Affected
Oracle
Search vendor "Oracle"
Hospitality Guest Access
Search vendor "Oracle" for product "Hospitality Guest Access"
4.2.0
Search vendor "Oracle" for product "Hospitality Guest Access" and version "4.2.0"
-
Affected
Oracle
Search vendor "Oracle"
Hospitality Guest Access
Search vendor "Oracle" for product "Hospitality Guest Access"
4.2.1
Search vendor "Oracle" for product "Hospitality Guest Access" and version "4.2.1"
-
Affected
Oracle
Search vendor "Oracle"
Hyperion Infrastructure Technology
Search vendor "Oracle" for product "Hyperion Infrastructure Technology"
11.1.2.4
Search vendor "Oracle" for product "Hyperion Infrastructure Technology" and version "11.1.2.4"
-
Affected
Oracle
Search vendor "Oracle"
Instantis Enterprisetrack
Search vendor "Oracle" for product "Instantis Enterprisetrack"
>= 17.1 <= 17.3
Search vendor "Oracle" for product "Instantis Enterprisetrack" and version " >= 17.1 <= 17.3"
-
Affected
Oracle
Search vendor "Oracle"
Mysql Enterprise Monitor
Search vendor "Oracle" for product "Mysql Enterprise Monitor"
>= 4.0.0 <= 4.0.12
Search vendor "Oracle" for product "Mysql Enterprise Monitor" and version " >= 4.0.0 <= 4.0.12"
-
Affected
Oracle
Search vendor "Oracle"
Mysql Enterprise Monitor
Search vendor "Oracle" for product "Mysql Enterprise Monitor"
>= 8.0.0 <= 8.0.20
Search vendor "Oracle" for product "Mysql Enterprise Monitor" and version " >= 8.0.0 <= 8.0.20"
-
Affected
Oracle
Search vendor "Oracle"
Retail Order Broker
Search vendor "Oracle" for product "Retail Order Broker"
15.0
Search vendor "Oracle" for product "Retail Order Broker" and version "15.0"
-
Affected
Oracle
Search vendor "Oracle"
Siebel Ui Framework
Search vendor "Oracle" for product "Siebel Ui Framework"
<= 20.5
Search vendor "Oracle" for product "Siebel Ui Framework" and version " <= 20.5"
-
Affected
Oracle
Search vendor "Oracle"
Transportation Management
Search vendor "Oracle" for product "Transportation Management"
6.3.7
Search vendor "Oracle" for product "Transportation Management" and version "6.3.7"
-
Affected
Oracle
Search vendor "Oracle"
Workload Manager
Search vendor "Oracle" for product "Workload Manager"
12.2.0.1
Search vendor "Oracle" for product "Workload Manager" and version "12.2.0.1"
-
Affected
Oracle
Search vendor "Oracle"
Workload Manager
Search vendor "Oracle" for product "Workload Manager"
18c
Search vendor "Oracle" for product "Workload Manager" and version "18c"
-
Affected
Oracle
Search vendor "Oracle"
Workload Manager
Search vendor "Oracle" for product "Workload Manager"
19c
Search vendor "Oracle" for product "Workload Manager" and version "19c"
-
Affected