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HIGH

CVE-2019-15691

CVSS v3

7.2

HIGH

EPSS Score

4.7 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2019-15691 Red Hat Product Security222 products fixed · 5 known affected

    tigervnc: Stack use-after-return due to incorrect usage of stack memory in ZRLEDecoder

    tigervnc as a component of Red Hat Enterprise Linux 6 · tigervnc-server as a component of Red Hat Enterprise Linux 6 · tigervnc-server-applet as a component of Red Hat Enterprise Linux 6

  • RHSA-2020:3875 Red Hat Product Security56 products fixed

    Red Hat Security Advisory: tigervnc security and bug fix update

  • RHSA-2020:1497 Red Hat Product Security38 products fixed

    Red Hat Security Advisory: tigervnc security update

Full record on NVD

Description

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.

Technical details

Published
2019-12-26

Frequently asked questions

What is CVE-2019-15691?

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.

Is CVE-2019-15691 actively exploited?

Active exploitation of CVE-2019-15691 has not been confirmed. Its EPSS score was 4.7% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-15691?

CVE-2019-15691 has a CVSS v3 base score of 7.2 (HIGH severity).

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