// For flags

CVE-2019-20637

varnish: not clearing pointer between two client requests leads to information disclosure

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

An issue was discovered in Varnish Cache before 6.0.5 LTS, 6.1.x and 6.2.x before 6.2.2, and 6.3.x before 6.3.1. It does not clear a pointer between the handling of one client request and the next request within the same connection. This sometimes causes information to be disclosed from the connection workspace, such as data structures associated with previous requests within this connection or VCL-related temporary headers.

Se detectó un problema en Varnish Cache versiones anteriores a 6.0.5 LTS, versiones 6.1.x y versiones 6.2.x anteriores a 6.2.2 y versiones 6.3.x anteriores a 6.3.1. No borra un puntero entre el manejo de una petición de cliente y la siguiente petición dentro de la misma conexión. Esto a veces causa que la información sea revelada desde el espacio de trabajo de la conexión, tales como las estructuras de datos asociadas con peticiones anteriores dentro de esta conexión o los encabezados temporales relacionados con VCL.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-04-08 CVE Reserved
  • 2020-04-08 CVE Published
  • 2024-02-11 EPSS Updated
  • 2024-08-05 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-212: Improper Removal of Sensitive Information Before Storage or Transfer
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Varnish-cache
Search vendor "Varnish-cache"
 Varnish Cache
Search vendor "Varnish-cache" for product "Varnish Cache"
 >= 6.1.0 < 6.2.2
Search vendor "Varnish-cache" for product "Varnish Cache" and version " >= 6.1.0 < 6.2.2"
-
Affected
Varnish-cache
Search vendor "Varnish-cache"
 Varnish Cache
Search vendor "Varnish-cache" for product "Varnish Cache"
 >= 6.3.0 < 6.3.1
Search vendor "Varnish-cache" for product "Varnish Cache" and version " >= 6.3.0 < 6.3.1"
-
Affected
Varnish-software
Search vendor "Varnish-software"
 Varnish Cache
Search vendor "Varnish-software" for product "Varnish Cache"
 >= 6.0.0 < 6.0.5
Search vendor "Varnish-software" for product "Varnish Cache" and version " >= 6.0.0 < 6.0.5"
lts
Affected
Opensuse
Search vendor "Opensuse"
 Backports Sle
Search vendor "Opensuse" for product "Backports Sle"
 15.0
Search vendor "Opensuse" for product "Backports Sle" and version "15.0"
sp1
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