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.

• CWE-825
• CWE-672

• 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

Published

Dec 26, 2019

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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