CVE-2023-23397: listed in the CISA KEV catalog

CVE-2023-23397 · CVSS 9.8 CRITICAL · EPSS 97% · KEV 2023-03-14

Microsoft Outlook Elevation of Privilege Vulnerability

Is CVE-2023-23397 exploited?

• Listed in the CISA KEV catalog on 2023-03-14.
• Federal remediation due 2023-04-04.
• Past that date by 1229 days.
• EPSS puts exploitation in the next 30 days at 97%.
• Public exploit code: none found in monitored sources.

Which products and versions are affected?

No affected package list recorded here yet.

Is there a patch?

No patch identifier recorded here yet.

What PlainSec published about CVE-2023-23397

• APT28’s tooling is now disposable (2026-06-12)

Primary sources

• NVD record
• CISA KEV catalog

What this record does not say

• No affected package data.
• No patch identifier.

KEV and EPSS are re-checked daily. Record last updated 2026-08-11.