{"cve":"CVE-2019-14899","nvd":{"published":"2019-12-11T15:15:14.263","modified":"2026-06-17T02:19:16.653","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H","score":7.4},"cwes":["CWE-300"],"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"],"products":["apple:ipados","apple:iphone_os","apple:mac_os_x","apple:macos","apple:tvos","freebsd:freebsd","linux:linux_kernel","openbsd:openbsd"],"source":"nvd","synced_at":"2026-10-19T20:59:27.069234358+00:00"},"epss":{"cve":"CVE-2019-14899","score":0.00838,"percentile":0.57823,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}