CVE-2019-8259

Ultravnc vulnerability

CVSS

7.5

EPSS

3.0%

EPSS pct

86th

Exploited

No known

UltraVNC revision 1198 contains multiple memory leaks (CWE-655) in VNC client code, which allow an attacker to read stack memory and can be abused for information disclosure. Combined with another vulnerability, it can be used to leak stack memory and bypass ASLR. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1199.

Affected vendor

Uvnc

Affected product

Ultravnc

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness type (CWE)

CWE-665 — Improper Initialization
CWE-401 — Missing Release of Memory (Memory Leak)

Published

2019-03-05

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality.

Its EPSS score of 3.0% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 86% of all scored CVEs.

Check your external exposure to CVE-2019-8259

Confirm whether Uvnc Ultravnc is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2019-8259.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-8259

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-8259 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

Run a free external exposure scan

Are you exposed to CVE-2019-8259?

Run an instant, non-intrusive external scan to check your attack surface for CVE-2019-8259.

Start free scan

No credit card. Agentless.

Related vulnerabilities