What is CVE-2019-8790?

CVE-2019-8790 is a medium-severity vulnerability in Apple Swift, classified under CWE-922. CVSS score: 5.5/10. Published 2020-10-27.

How severe is CVE-2019-8790?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Apple Swift

CVE-2019-8790

This issue was addresses by updating incorrect URLSession file descriptors management logic to match Swift 5.0. This issue is fixed in Swift 5.1.1 for Ubuntu. Incorrect management of file descriptors in URLSession could lead to inadvertent data disclosure.

Published 2020-10-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (27.6th percentile), scored 2026-10-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Apple Swift
Apple Swift For Ubuntu — versions unspecified

Weakness classification (CWE)

CWE-922

References

support.apple.com/en-us/HT210647 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2019-8790?: CVE-2019-8790 is a medium-severity vulnerability in Apple Swift, classified under CWE-922. CVSS score: 5.5/10. Published 2020-10-27.
How severe is CVE-2019-8790?: Medium severity. CVSS v3 base score is 5.5 out of 10.