CVE-2008-4770

Realvnc vulnerability

CVSS

10.0

EPSS

4.1%

EPSS pct

90th

Exploited

No known

The CMsgReader::readRect function in the VNC Viewer component in RealVNC VNC Free Edition 4.0 through 4.1.2, Enterprise Edition E4.0 through E4.4.2, and Personal Edition P4.0 through P4.4.2 allows remote VNC servers to execute arbitrary code via crafted RFB protocol data, related to "encoding type."

Affected vendor

Realvnc

Affected product

Realvnc

CVSS vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Weakness type (CWE)

CWE-20 — Improper Input Validation

Published

2009-01-16

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to complete impact to confidentiality, complete impact to integrity, complete impact to availability.

Its EPSS score of 4.1% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 90% of all scored CVEs.

Check your external exposure to CVE-2008-4770

Confirm whether Realvnc Realvnc is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2008-4770.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2008-4770

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2008-4770 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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