What is CVE-2023-5183?

CVE-2023-5183 is a critical-severity vulnerability in Illumio Core Pce, classified under Deserialization of Untrusted Data. CVSS score: 9.9/10. Published 2023-09-27.

How severe is CVE-2023-5183?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Deserialization in Illumio Core Pce

CVE-2023-5183

Unsafe deserialization of untrusted JSON allows execution of arbitrary code on affected releases of the Illumio PCE. Authentication to the API is required to exploit this vulnerability. The flaw exists within the network_traffic API endpoint. An attacker can leverage this vulnerability to execute code in the context of the PCE’s operating system user.

Vulnerability class: Insecure Deserialization

Published 2023-09-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.018 (77.7th percentile), scored 2026-10-05.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.018 · change: +0.002

Affected products

Illumio Core Pce — versions 19.3.0, 21.2.0, 21.5.0
Illumio Core Policy Compute Engine

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

docs.illumio.com/Guides/security-advisories/september-2023/cve-2023-5183.htm (Vendor Advisory)

Frequently asked questions

What is CVE-2023-5183?: CVE-2023-5183 is a critical-severity vulnerability in Illumio Core Pce, classified under Deserialization of Untrusted Data. CVSS score: 9.9/10. Published 2023-09-27.
How severe is CVE-2023-5183?: Critical severity. CVSS v3 base score is 9.9 out of 10.