What is CVE-2023-4509?

CVE-2023-4509 is a medium-severity vulnerability in Linux Kernel, classified under Cleartext Transmission of Sensitive Information. CVSS score: 4.3/10. Published 2024-04-18.

How severe is CVE-2023-4509?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Linux Kernel

CVE-2023-4509

It is possible for an API key to be logged in clear text in the audit log file after an invalid login attempt.

Published 2024-04-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.002 (12.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 12.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Linux Kernel
Microsoft Windows
Octopus Server
Octopus Deploy Server — versions 2018.9, 2024.1, 2024.2

Weakness classification (CWE)

CWE-319 — Cleartext Transmission of Sensitive Information

References

advisories.octopus.com/post/2024/sa2024-02/ (Vendor Advisory)

Frequently asked questions

What is CVE-2023-4509?: CVE-2023-4509 is a medium-severity vulnerability in Linux Kernel, classified under Cleartext Transmission of Sensitive Information. CVSS score: 4.3/10. Published 2024-04-18.
How severe is CVE-2023-4509?: Medium severity. CVSS v3 base score is 4.3 out of 10.