Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2021-42785— Buffer Overflow in tvnviewer.exe via Crafted Packet in TightVNC Viewer 2.8.59

Quick assessment

Affected
GlavSoft LLC TightVNC Viewer
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.

TightVNC是一套跨平台的开源远程桌面软件。 TightVNC Viewer的tvnviewer.exe存在安全漏洞，攻击者可利用该漏洞借助特制的FramebufferUpdate数据包从VNC服务器执行任意指令。

AI Predicted 9.8 Difficulty: Easy EPSS 2.27% · P82
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2021-42785

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Buffer Overflow in tvnviewer.exe via Crafted Packet in TightVNC Viewer 2.8.59
Source: CVE Program / CVE List V5
Vulnerability Description
Buffer Overflow vulnerability in tvnviewer.exe of TightVNC Viewer allows a remote attacker to execute arbitrary instructions via a crafted FramebufferUpdate packet from a VNC server.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
TightVNC 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TightVNC是一套跨平台的开源远程桌面软件。 TightVNC Viewer的tvnviewer.exe存在安全漏洞，攻击者可利用该漏洞借助特制的FramebufferUpdate数据包从VNC服务器执行任意指令。
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
GlavSoft LLC TightVNC Viewer 2.8.59 ~ 2.8.59 -

II. Public POCs for CVE-2021-42785

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2021-42785

请登录查看更多情报信息。

Vendor Pages for CVE-2021-42785 (1)

IV. Related Vulnerabilities

Same weakness: CWE-120

V. Comments for CVE-2021-42785

No comments yet

Leave a comment