CVE-2019-8849

Name: CVE-2019-8849
Creator: NVD / NIST
Published: 2019-12-18T18:15:44.99+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.21%

Last modified Jun 17, 2026

CVE-2019-8849 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The issue was addressed by signaling that an executable stack is not required. This issue is fixed in SwiftNIO SSL 2.4.1. EPSS estimates a 2.21% chance of exploitation in the next 30 days.

Description

The issue was addressed by signaling that an executable stack is not required. This issue is fixed in SwiftNIO SSL 2.4.1. A SwiftNIO application using TLS may be able to execute arbitrary code.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.21%

80.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Apple	Swiftnio Ssl	< 2.4.1

References

https://support.apple.com/HT210772Vendor Advisory
https://support.apple.com/HT210772Vendor Advisory

Timeline

Published: Dec 18, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-8849?

The issue was addressed by signaling that an executable stack is not required. This issue is fixed in SwiftNIO SSL 2.4.1. A SwiftNIO application using TLS may be able to execute arbitrary code.

How severe is CVE-2019-8849?

CVE-2019-8849 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.21% probability of exploitation in the next 30 days.

How do I fix CVE-2019-8849?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-8849?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST