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CVE-2018-20024

Quick assessment

Affected

n/a LibVNC

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LibVNC是一款用于实现VNC服务器和客户端功能的跨平台C库。 LibVNC commit 4a21bbd097ef7c44bb000c3bd0907f96a10e4ce7之前版本中的VNC客户端代码存在空指针逆向引用漏洞。攻击者可利用该漏洞造成拒绝服务。

AI Predicted 5.3 Difficulty: Easy EPSS 3.17% · P88 Updated Feb 21, 2026

Possible ATT&CK Techniques 2 AI

T1499 · Endpoint Denial of Service T1499.003 · Application Exhaustion Flood

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I. Basic Information for CVE-2018-20024

Vulnerability Information

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Vulnerability Title

N/A

Source: CVE Program / CVE List V5

Vulnerability Description

LibVNC before commit 4a21bbd097ef7c44bb000c3bd0907f96a10e4ce7 contains null pointer dereference in VNC client code that can result DoS.

Source: CVE Program / CVE List V5

CVSS Information

N/A

Source: CVE Program / CVE List V5

Vulnerability Type

N/A

Source: CVE Program / CVE List V5

Vulnerability Title

LibVNC 代码问题漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
-	LibVNC	commit 4a21bbd097ef7c44bb000c3bd0907f96a10e4ce7	-

II. Public POCs for CVE-2018-20024

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2018-20024

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Vendor Advisories for CVE-2018-20024 (7)

https://www.debian.org/security/2019/dsa-4383 vendor-advisory x_refsource_DEBIAN
https://usn.ubuntu.com/4587-1/ vendor-advisory x_refsource_UBUNTU
https://usn.ubuntu.com/4547-1/ vendor-advisory x_refsource_UBUNTU
https://usn.ubuntu.com/3877-1/ vendor-advisory x_refsource_UBUNTU
https://usn.ubuntu.com/4547-2/ vendor-advisory x_refsource_UBUNTU
https://security.gentoo.org/glsa/202006-06 vendor-advisory x_refsource_GENTOO
https://security.gentoo.org/glsa/201908-05 vendor-advisory x_refsource_GENTOO

Mailing List Discussions for CVE-2018-20024 (3)

https://lists.debian.org/debian-lts-announce/2019/11/msg00033.html mailing-list x_refsource_MLIST
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html mailing-list x_refsource_MLIST
https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html mailing-list x_refsource_MLIST

Other References for CVE-2018-20024 (1)

https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-034-libvnc-null-pointer-dereference/ x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2018-20024

Same Patch Batch · n/a · 2018-12-19 · 22 CVEs total

CVE-2018-15127		LibVNC 缓冲区错误漏洞
CVE-2018-20231		WordPress two-factor-authentication插件跨站请求伪造漏洞
CVE-2018-20230		PSPP 缓冲区错误漏洞
CVE-2018-20228		Subsonic 跨站请求伪造漏洞
CVE-2018-20227		RDF4J 路径遍历漏洞
CVE-2018-6307		LibVNC 安全漏洞
CVE-2018-20023		LibVNC 信息泄露漏洞
CVE-2018-20022		LibVNC 信息泄露漏洞
CVE-2018-20021		LibVNC 资源管理错误漏洞
CVE-2018-20020		LibVNC 缓冲区错误漏洞
CVE-2018-20019		LibVNC 缓冲区错误漏洞
CVE-2018-20299		Rebert Bosch 360° Indoor Camera和Eyes Outdoor Camera 缓冲区错误漏洞
CVE-2018-15126		LibVNC 安全漏洞
CVE-2018-20298		S3 Browser 安全漏洞
CVE-2018-18999		Advantech WebAccess/SCADA 缓冲区错误漏洞
CVE-2018-19598		Statamic 跨站脚本漏洞
CVE-2018-19597		CMS Made Simple 跨站脚本漏洞
CVE-2018-19596		Zurmo 安全漏洞
CVE-2018-19508		CMSimple 跨站脚本漏洞
CVE-2018-19507		CMSimple 跨站脚本漏洞

Showing top 20 of 22 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: LibVNC

Same vendor: n/a