What’s Vulnerable › Vulnerabilities

CVE-2019-15691

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-12-26 · updated 2026-06-17
• Weakness: CWE-825

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.

Affected products

• openSUSE Leap: 15.1
• Kaspersky TigerVNC: before 1.10.1 — fixed in 1.10.1

How to fix

Upgrade to a fixed version: Kaspersky TigerVNC 1.10.1. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00039.html
• https://github.com/CendioOssman/tigervnc/commit/d61a767d6842b530ffb532ddd5a3d233119aad40
• https://github.com/TigerVNC/tigervnc/releases/tag/v1.10.1
• https://www.openwall.com/lists/oss-security/2019/12/20/2
• http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00039.html
• https://github.com/CendioOssman/tigervnc/commit/d61a767d6842b530ffb532ddd5a3d233119aad40
• https://github.com/TigerVNC/tigervnc/releases/tag/v1.10.1
• https://www.openwall.com/lists/oss-security/2019/12/20/2

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