How severe is CVE-2013-3870?

CVE-2013-3870 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2013-3870 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 19% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-3870?

CVE-2013-3870 primarily affects Microsoft Outlook. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-3870?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2013-3870 published?

CVE-2013-3870 was published on 2013-09-11 and last updated on 2026-06-16.

CVE-2013-3870

CVE-2013-3870 is a critical-severity vulnerability in Microsoft Outlook with a CVSS 2.0 base score of 9.3. Its EPSS exploit-prediction score of 19% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-399.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 19% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Microsoft Outlook
Published: 2013-09-11
Last modified: 2026-06-16

Description

Double free vulnerability in Microsoft Outlook 2007 SP3 and 2010 SP1 and SP2 allows remote attackers to execute arbitrary code by including many nested S/MIME certificates in an e-mail message, aka "Message Certificate Vulnerability."

Frequently asked questions

What is CVE-2013-3870?: Double free vulnerability in Microsoft Outlook 2007 SP3 and 2010 SP1 and SP2 allows remote attackers to execute arbitrary code by including many nested S/MIME certificates in an e-mail message, aka "Message Certificate Vulnerability."
How severe is CVE-2013-3870?: CVE-2013-3870 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2013-3870 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 19% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-3870?: CVE-2013-3870 primarily affects Microsoft Outlook. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-3870?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2013-3870 published?: CVE-2013-3870 was published on 2013-09-11 and last updated on 2026-06-16.

References

Affected products (5)

cpe:2.3:a:microsoft:outlook:2007:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:outlook:2010:sp1:*:*:*:*:x64:*
cpe:2.3:a:microsoft:outlook:2010:sp1:*:*:*:x86:*:*
cpe:2.3:a:microsoft:outlook:2010:sp2:*:*:*:*:x64:*
cpe:2.3:a:microsoft:outlook:2010:sp2:*:*:*:x86:*:*

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