What is CVE-2016-0138?

CVE-2016-0138 is a medium-severity vulnerability in Microsoft Exchange Server, classified under Information Disclosure. CVSS score: 4.3/10. Published 2016-09-14.

How severe is CVE-2016-0138?

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

Information disclosure in Microsoft Exchange Server

CVE-2016-0138

Microsoft Exchange Server 2007 SP3, 2010 SP3, 2013 SP1, 2013 Cumulative Update 12, 2013 Cumulative Update 13, 2016 Cumulative Update 1, and 2016 Cumulative Update 2 misparses e-mail messages, which allows remote authenticated users to obtain sensitive Outlook application information by leveraging the Send As right, aka "Microsoft Exchange Information Disclosure Vulnerability."

Vulnerability class: Information Disclosure

Published 2016-09-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.135 (96.3th percentile), scored 2026-10-02.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.135 · newest: 0.135 · change: 0.000

Affected products

Microsoft Exchange Server — versions 2007, 2010, 2013

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-108 (vendor-advisory)
www.securitytracker.com/id/1036778 (vdb-entry)
www.securityfocus.com/bid/92806 (vdb-entry)

Frequently asked questions

What is CVE-2016-0138?: CVE-2016-0138 is a medium-severity vulnerability in Microsoft Exchange Server, classified under Information Disclosure. CVSS score: 4.3/10. Published 2016-09-14.
How severe is CVE-2016-0138?: Medium severity. CVSS v3 base score is 4.3 out of 10.