CVE-2019-8258CWE-122

UltraVNC revision 1198 has a heap buffer overflow vulnerability in VNC client code which results code execution

published March 5, 2019

CVSS
—
EPSS
4%
Percentile
91.3
In the wild
Unconfirmed
What it is

⚠️ A heap buffer overflow in UltraVNC could let an attacker execute arbitrary code just by sending the right network request! Think of it as a delivery driver who makes a mistake and opens a package that wasn’t meant for them, allowing them to access sensitive contents. This vulnerability lets an attacker sneak in and run whatever they want, like the wrong driver getting access to your private documents. If exploited, this vulnerability could allow an unauthorized user to run malicious code on the affected system, potentially compromising sensitive data or taking full control. This could lead to catastrophic consequences if the system is part of a larger network, opening the door to further attacks.

Put simply

Think of it as a delivery driver who makes a mistake and opens a package that wasn’t meant for them, allowing them to access sensitive contents. This vulnerability lets an attacker sneak in and run whatever they want, like the wrong driver getting access to your private documents. The vulnerability in UltraVNC revision 1198 is a heap buffer overflow in the VNC client code, which can be triggered through network connectivity. This could allow an attacker to execute arbitrary code remotely.

What to do

If exploited, this vulnerability could allow an unauthorized user to run malicious code on the affected system, potentially compromising sensitive data or taking full control. This could lead to catastrophic consequences if the system is part of a larger network, opening the door to further attacks. Upgrade to UltraVNC revision 1199 immediately to patch this vulnerability. Additionally, consider implementing network restrictions to limit access to the VNC server from untrusted sources until you upgrade. Regularly check for updates to maintain security. You've got this! With the right actions, you can secure your systems in no time. 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.04434 · 91.3th percentile
Weakness
CWE-122 · Heap-based Buffer Overflow
Published
2019-03-05T15:00Z
EPSS history
Timeline
  • 05 MAR 15:00Z
    UltraVNC revision 1198 has a heap buffer overflow vulnerability in VNC client code which results code execution
    cvelistv5