CVE-2020-26117

Tigervnc vulnerability

CVSS

8.1

EPSS

3.1%

EPSS pct

86th

Exploited

No known

In rfb/CSecurityTLS.cxx and rfb/CSecurityTLS.java in TigerVNC before 1.11.0, viewers mishandle TLS certificate exceptions. They store the certificates as authorities, meaning that the owner of a certificate could impersonate any server after a client had added an exception.

Affected vendor

Tigervnc

Affected product

Tigervnc

CVSS vector

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

Weakness type (CWE)

CWE-295 — Improper Certificate Validation

Published

2020-09-27

Risk analysis

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

Its EPSS score of 3.1% 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-2020-26117

Confirm whether Tigervnc Tigervnc is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2020-26117.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2020-26117

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