THREATPORT/VULNERABILITY/CVE-2019-15691
HIGH SEVERITY

CVE-2019-15691

Tigervnc vulnerability

CVSS
7.2
EPSS
4.7%
EPSS pct
91th
Exploited
No known
TigerVNC version prior to 1.10.1 is vulnerable to stack use-after-return, which occurs due to incorrect usage of stack memory in ZRLEDecoder. If decoding routine would throw an exception, ZRLEDecoder may try to access stack variable, which has been already freed during the process of stack unwinding. Exploitation of this vulnerability could potentially result into remote code execution. This attack appear to be exploitable via network connectivity.
Affected vendor
Tigervnc
Affected product
Tigervnc
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
  • CWE-825
  • CWE-672 — Operation on a Resource after Expiration or Release
Published
2019-12-26

Risk analysis

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

Its EPSS score of 4.7% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 91% of all scored CVEs.

Check your external exposure to CVE-2019-15691

  • Confirm whether Tigervnc Tigervnc is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2019-15691.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-15691

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-15691 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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