CVE-2010-0816Outlook Express Vulnerability
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…
Published May 12, 2010 · Updated Apr 28, 2026
Key Facts
Patch immediately- CVE-2010-0816 is a critical-severity vulnerability (CVSS 9.3 v2) affecting Outlook Express (Microsoft), Windows Live Mail (Microsoft), Windows Mail (Microsoft).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 20% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v2
9.3
AV:N/AC:M/Au:N/C:C/I:C/A:C
EPSS (30-day exploit likelihood)
20%
Higher than 97.4% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
34/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
3
Reports of active use
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."
Affected Products
5 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Outlook ExpressMicrosoft | 5.5-sp2, 6.0, 6.0-sp1 | n/a |
| Windows Live MailMicrosoft | See advisory | n/a |
| Windows MailMicrosoft | See advisory | n/a |
Timeline
Publicly disclosed
May 12, 2010
Last updated
Apr 28, 2026
Weakness Type
- CWE-189
References
- exploit20100511 {PRL} Microsoft Windows Outlook Express and Windows Mail Integer Overflow
- exploitExploitDB-12564
- exploitprotekresearchlab.com
- exploit40052
- otherMS10-030
FAQ
Common Questions.
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 r…
Affected: Outlook Express (Microsoft) versions 5.5-sp2, 6.0, 6.0-sp1; Windows Live Mail (Microsoft); Windows Mail (Microsoft). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2010-0816 On Your Attack Surface?
Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.
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