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Vulnerabilities

Vulnerability · 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 connect…

Published Dec 11, 2019 · catalog updated Jun 17, 2026 · Apple

Check if you run it

No confirmed exploitation is on record for CVE-2019-14899. EPSS is 0.84%. Act only if a listed version of Apple is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.84%
Remediation
Version ranges on file
Affected products
cpe apple/ipados · cpe apple/iphone os · cpe apple/mac os x · cpe apple/macos · cpe apple/tvos · cpe freebsd/freebsd

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe apple/ipados< 13.6
  • cpe apple/iphone os< 13.6
  • cpe apple/mac os x< 10.15.6
  • cpe apple/macos11.0
  • cpe apple/tvos< 13.4.8
  • cpe freebsd/freebsdversion unspecified
  • cpe linux/linux kernelversion unspecified
  • cpe openbsd/openbsdversion unspecified

How to fix CVE-2019-14899

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2019-14899. EPSS is 0.84%. Act only if a listed version of Apple is installed.

Which versions are affected?

Compare what you have installed with apple/iphone os < 13.6; apple/mac os x < 10.15.6. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-300. EPSS 0.84%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 11, 2019 · Apple Security Releases

    Detected

    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 ev

  2. Jun 17, 2026 · Apple Security Releases

    Updated

    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 ev

Sources

  • Apple Security ReleasesVendor advisoryCVE-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 ev

    nvd.nist.gov
  • CVE.orgVulnerability recordCVE-2019-14899

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2019-14899

    30-day exploitation probability 0.84%

    first.org

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.