CVE-2018-20021

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

LibVNC before commit c3115350eb8bb635d0fdb4dbbb0d0541f38ed19c contains a CWE-835: Infinite loop vulnerability in VNC client code. Vulnerability allows attacker to consume excessive amount of resources like CPU and RAM

LibVNC antes del commit con ID c3115350eb8bb635d0fdb4dbbb0d0541f38ed19c contiene una vulnerabilidad CWE-835: bucle infinito en el código del cliente VNC. Esta vulnerabilidad permite que el atacante consuma una cantidad excesiva de recursos como la CPU y la RAM.

*Credits: N/A

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

2018-12-10 CVE Reserved
2018-12-19 CVE Published
2024-07-14 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

CAPEC

References (12)

URL	Tag	Source
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-031-libvnc-infinite-loop	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html	Mailing List
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html	Mailing List
https://lists.debian.org/debian-lts-announce/2019/11/msg00033.html	Mailing List
https://lists.debian.org/debian-lts-announce/2019/12/msg00028.html	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://security.gentoo.org/glsa/201908-05	2020-10-23
https://security.gentoo.org/glsa/202006-06	2020-10-23
https://usn.ubuntu.com/3877-1	2020-10-23
https://usn.ubuntu.com/4547-1	2020-10-23
https://usn.ubuntu.com/4547-2	2020-10-23
https://usn.ubuntu.com/4587-1	2020-10-23
https://www.debian.org/security/2019/dsa-4383	2020-10-23

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Libvnc Project Search vendor "Libvnc Project"		Libvncserver Search vendor "Libvnc Project" for product "Libvncserver"				< 0.9.12 Search vendor "Libvnc Project" for product "Libvncserver" and version " < 0.9.12"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"		lts		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
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				18.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				18.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.10"		-		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