How severe is CVE-2016-0138?

CVE-2016-0138 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2016-0138 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-0138?

CVE-2016-0138 primarily affects Microsoft Exchange Server. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-0138?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-0138 published?

CVE-2016-0138 was published on 2016-09-14 and last updated on 2026-06-17.

CVE-2016-0138

CVE-2016-0138 is a medium-severity vulnerability in Microsoft Exchange Server with a CVSS 3.x base score of 4.3. Its EPSS exploit-prediction score of 13% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 13% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Microsoft Exchange Server
Published: 2016-09-14
Last modified: 2026-06-17

Description

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."

Frequently asked questions

What is 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."
How severe is CVE-2016-0138?: CVE-2016-0138 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2016-0138 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-0138?: CVE-2016-0138 primarily affects Microsoft Exchange Server. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-0138?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-0138 published?: CVE-2016-0138 was published on 2016-09-14 and last updated on 2026-06-17.

References

Affected products (7)

cpe:2.3:a:microsoft:exchange_server:2007:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server:2010:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_12:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_13:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server:2013:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_1:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_2:*:*:*:*:*:*

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