What’s Vulnerable › Vulnerabilities

CVE-2019-14899

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-12-11 · updated 2026-06-17
• Weakness: CWE-300

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.

Affected products

• Apple iPadOS: before 13.6 — fixed in 13.6
• Apple Iphone Os: before 13.6 — fixed in 13.6
• macOS: before 10.15.6 — fixed in 10.15.6
• Apple macOS: 11.0
• Apple tvOS: before 13.4.8 — fixed in 13.4.8
• FreeBSD: all versions
• Linux kernel: all versions
• OpenBSD: all versions

How to fix

Upgrade to a fixed version: Apple iPadOS 13.6; Apple Iphone Os 13.6; macOS 10.15.6; Apple tvOS 13.4.8. Check the vendor advisory for mitigations.

References

• http://seclists.org/fulldisclosure/2020/Dec/32
• http://seclists.org/fulldisclosure/2020/Jul/23
• http://seclists.org/fulldisclosure/2020/Jul/24
• http://seclists.org/fulldisclosure/2020/Jul/25
• http://seclists.org/fulldisclosure/2020/Nov/20
• http://www.openwall.com/lists/oss-security/2020/08/13/2
• http://www.openwall.com/lists/oss-security/2020/10/07/3
• http://www.openwall.com/lists/oss-security/2021/07/05/1
• 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/HT211289

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