CVE-2019-15691

Name: CVE-2019-15691
Creator: NVD / NIST
Published: 2019-12-26T15:15:11.007+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 4.72%

Last modified Jun 17, 2026

CVE-2019-15691 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. 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. EPSS estimates a 4.72% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.2/10

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

EPSS Probability

4.72%

90.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Tigervnc	Tigervnc	< 1.10.1
Opensuse	Leap	15.1

References

http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00039.htmlThird Party Advisory
https://github.com/CendioOssman/tigervnc/commit/d61a767d6842b530ffb532ddd5a3d233119aad40Patch, Third Party Advisory
https://github.com/TigerVNC/tigervnc/releases/tag/v1.10.1Release Notes, Third Party Advisory
https://www.openwall.com/lists/oss-security/2019/12/20/2Exploit, Mailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00039.htmlThird Party Advisory
https://github.com/CendioOssman/tigervnc/commit/d61a767d6842b530ffb532ddd5a3d233119aad40Patch, Third Party Advisory
https://github.com/TigerVNC/tigervnc/releases/tag/v1.10.1Release Notes, Third Party Advisory
https://www.openwall.com/lists/oss-security/2019/12/20/2Exploit, Mailing List, Third Party Advisory

Timeline

Published: Dec 26, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-15691?

How severe is CVE-2019-15691?

CVE-2019-15691 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 4.72% probability of exploitation in the next 30 days.

How do I fix CVE-2019-15691?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-15691?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST