How severe is CVE-2010-0816?

CVE-2010-0816 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2010-0816 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 20% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2010-0816?

CVE-2010-0816 primarily affects Microsoft Outlook Express. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2010-0816?

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-2010-0816 published?

CVE-2010-0816 was published on 2010-05-12 and last updated on 2026-06-16.

CVE-2010-0816

CVE-2010-0816 is a critical-severity vulnerability in Microsoft Outlook Express with a CVSS 2.0 base score of 9.3. Its EPSS exploit-prediction score of 20% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-189.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 20% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Microsoft Outlook Express
Published: 2010-05-12
Last modified: 2026-06-16

Description

Integer overflow in inetcomm.dll in Microsoft Outlook Express 5.5 SP2, 6, and 6 SP1; Windows Live Mail on Windows XP SP2 and SP3, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7; and Windows Mail on Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7 allows remote e-mail servers and man-in-the-middle attackers to execute arbitrary code via a crafted (1) POP3 or (2) IMAP response, as demonstrated by a certain +OK response on TCP port 110, aka "Outlook Express and Windows Mail Integer Overflow Vulnerability."

Frequently asked questions

What is CVE-2010-0816?: Integer overflow in inetcomm.dll in Microsoft Outlook Express 5.5 SP2, 6, and 6 SP1; Windows Live Mail on Windows XP SP2 and SP3, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7; and Windows Mail on Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7 allows remote e-mail servers and man-in-the-middle attackers to execute arbitrary code via a crafted (1) POP3 or (2) IMAP response, as demonstrated by a certain +OK response on TCP port 110, aka "Outlook Express and Windows Mail Integer Overflow Vulnerability."
How severe is CVE-2010-0816?: CVE-2010-0816 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2010-0816 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 20% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2010-0816?: CVE-2010-0816 primarily affects Microsoft Outlook Express. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2010-0816?: 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-2010-0816 published?: CVE-2010-0816 was published on 2010-05-12 and last updated on 2026-06-16.

References

Affected products (5)

cpe:2.3:a:microsoft:outlook_express:5.5:sp2:*:*:*:*:*:*
cpe:2.3:a:microsoft:outlook_express:6.0:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:outlook_express:6.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:windows_live_mail:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:windows_mail:*:*:*:*:*:*:*:*

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