Vulnerability record · CVE-2019-8849 · published 18 December 2019

CVE-2019-8849: Apple swiftnio ssl vulnerability

Apple · Swiftnio Ssl

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.

9.8 CVSS 3.1 Critical EPSS 2.2% · top 17.9%

9.8CVSS 3.1 base score, v2 7.5

2.2%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

2References

17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Swiftnio Ssl Apple

References

Link	Tags
https://support.apple.com/HT210772	Vendor Advisory
https://support.apple.com/HT210772	Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.7CVE-2026-43820Apple swiftnio ssl out-of-bounds read vulnerabilityNIOSSLCertificate._subjectAlternativeNames provides access to the raw bytes for a cert's SANs. NIOSSL provides access to a buffer assumed to be backe…EPSS 0.11%23 Jul 2026

Source: NIST National Vulnerability Database (record CVE-2019-8849), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.