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CVE-2019-8849

30
FAUCET Score

CVE-2019-8849 is a critical vulnerability affecting SwiftNIO SSL versions prior to 2.4.1, where a SwiftNIO application utilizing TLS could be susceptible to arbitrary code execution. With a CVSS score of 9.8 (CRITICAL), this vulnerability has a network attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. While there is no evidence of active exploitation or publicly available exploit code in Metasploit or ExploitDB, the vulnerability has garnered significant community discussion with 10 mentions, indicating awareness and potential interest. The issue was resolved by signaling that an executable stack is not required.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.4.1CPE matchmatch criteria
cpe:2.3:a:apple:swiftnio_ssl:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.21%
Probability of exploitation in next 30 days
EPSS Percentile
80.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0221 is in the 70th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

swiftpatch availablevia ghsa
Product: github.com/apple/swift-nio-sslFixed in: 2.4.1
applevendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

swiftGHSA-frg3-gpcx-968fcritical

SwiftNIO SSL arbitrary code execution vulnerability

May 24, 2022

References

support.apple.com / HT210772
Vendor Advisory