Vulnerability Monitor

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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, 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.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.4, indicating it requires adjacent network access with relatively low complexity though user interaction is required requiring only low-level privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 8 products from freebsd, from linux, from openbsd and 5 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2019, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2019-12-11T15:15:14.263

Last Modified

2024-11-21T04:27:38.590

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.4 (HIGH)

CVSSv2 Vector

AV:A/AC:M/Au:S/C:P/I:P/A:P

Access Vector: ADJACENT_NETWORK
Access Complexity: MEDIUM
Authentication: SINGLE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

4.4

Impact Score

6.4

Weaknesses

Type: Secondary
CWE-300
Type: Secondary
NVD-CWE-Other

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	freebsd	freebsd	-	Yes
Operating System	linux	linux_kernel	-	Yes
Operating System	openbsd	openbsd	-	Yes
Operating System	apple	ipados	< 13.6	Yes
Operating System	apple	iphone_os	< 13.6	Yes
Operating System	apple	mac_os_x	< 10.15.6	Yes
Operating System	apple	macos	11.0	Yes
Operating System	apple	tvos	< 13.4.8	Yes

References

http://seclists.org/fulldisclosure/2020/Dec/32 Mailing List, Third Party Advisory ([email protected])
http://seclists.org/fulldisclosure/2020/Jul/23 Mailing List, Third Party Advisory ([email protected])
http://seclists.org/fulldisclosure/2020/Jul/24 Mailing List, Third Party Advisory ([email protected])
http://seclists.org/fulldisclosure/2020/Jul/25 Mailing List, Third Party Advisory ([email protected])
http://seclists.org/fulldisclosure/2020/Nov/20 Mailing List, Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2020/08/13/2 Mailing List, Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2020/10/07/3 Mailing List, Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2021/07/05/1 Mailing List, Third Party Advisory ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14899 Issue Tracking, Third Party Advisory ([email protected])
https://openvpn.net/security-advisory/no-flaws-found-in-openvpn-software/ Third Party Advisory ([email protected])
https://support.apple.com/kb/HT211288 Third Party Advisory ([email protected])
https://support.apple.com/kb/HT211289 Third Party Advisory ([email protected])
https://support.apple.com/kb/HT211290 Third Party Advisory ([email protected])
https://support.apple.com/kb/HT211850 Third Party Advisory ([email protected])
https://support.apple.com/kb/HT211931 Third Party Advisory ([email protected])
http://seclists.org/fulldisclosure/2020/Dec/32 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://seclists.org/fulldisclosure/2020/Jul/23 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://seclists.org/fulldisclosure/2020/Jul/24 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://seclists.org/fulldisclosure/2020/Jul/25 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://seclists.org/fulldisclosure/2020/Nov/20 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2020/08/13/2 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2020/10/07/3 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2021/07/05/1 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14899 Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://openvpn.net/security-advisory/no-flaws-found-in-openvpn-software/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/kb/HT211288 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/kb/HT211289 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/kb/HT211290 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/kb/HT211850 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/kb/HT211931 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For freebsd's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.