Outlook Express vulnerabilitiesRanked by how likely they are to be used.

Product22 versions
The short answer

Outlook Express is made by Microsoft. We track 45 published vulnerabilities listed under that exact name, across 22 versions. None of them is on the list of flaws known to be exploited today. Microsoft lists newer releases under their own names, such as Outlook Express Book Control, so check those pages too.

See the riskiest flaws

We keep watching the known-exploited list.

Other names

Is Outlook Express listed under other names? Yes.

Microsoft also lists Outlook Express under more specific names, such as Outlook Express Book Control. Flaws listed only under those names are counted on their own pages, not here. If you run one of these, open its page for its own exploited flaws.

Known exploited

Which Outlook Express vulnerabilities are being exploited?

This is the list that matters most: flaws criminals are using now.

None of Outlook Express's published vulnerabilities is on the list of flaws known to be exploited today. We keep watching that list.

Exploit likelihood

Which Outlook Express flaws are most likely to be used?

Ranked by the latest exploit-likelihood forecast: the chance each flaw is used in an attack in the next 30 days. A high severity score on its own doesn't tell you that. Flaws shared by many other makers' products are left out.

50% or more10% to 49%Under 10%
  1. 74%

    Stack-based buffer overflow in the news reader for Microsoft Outlook Express (MSOE.DLL) 5.5 SP2, 6, and 6 SP1 allows remote malicious NNTP servers to execute arbitrary code via a LIST response with a long second field.

    CVSS7.5Published14 Jun 2005
  2. 63%

    The MHTML protocol handler in Microsoft Outlook Express 5.5 SP2 through Outlook Express 6 SP1 allows remote attackers to bypass domain restrictions and execute arbitrary code, as demonstrated on Internet Explorer...

    CVSS10.0Published4 May 2004
  3. 55%

    Heap-based buffer overflow in Microsoft Outlook Express 6 and earlier, and Windows Mail for Vista, allows remote Network News Transfer Protocol (NNTP) servers to execute arbitrary code via long NNTP responses that...

    CVSS9.3Published9 Oct 2007
  4. 40%

    A component in Microsoft Outlook Express 6 allows remote attackers to bypass domain restrictions and obtain sensitive information via redirections with the mhtml: URI handler, as originally reported for Internet...

    CVSS4.3Published1 May 2006
  5. 32%

    Buffer overflow in Microsoft Outlook and Outlook Express allows remote attackers to execute arbitrary commands via a long Date field in an email header, aka the "Malformed E-mail Header" vulnerability.

    CVSS5.0Published18 Jul 2000
  6. 29%

    Unspecified vulnerability in Microsoft Outlook Express 6 and earlier allows remote attackers to execute arbitrary code via a crafted contact record in a Windows Address Book (WAB) file.

    CVSS6.8Published13 Dec 2006
  7. 27%

    Internet Explorer 5.0 and 5.5, and Outlook Express 5.0 and 5.5, allow remote attackers to execute scripts when Active Scripting is disabled by including the scripts in XML stylesheets (XSL) that are referenced using...

    CVSS7.5Published20 Apr 2001
  8. 27%

    Microsoft Outlook Express allows remote attackers to monitor a user's email by creating a persistent browser link to the Outlook Express windows, aka the "Persistent Mail-Browser Link" vulnerability.

    CVSS5.0Published20 Jul 2000
  9. 27%

    The MHTML protocol handler in a component of Microsoft Outlook Express 5.5 SP2 and 6 through SP1, and Windows Mail, does not assign the correct Internet Explorer Security Zone to UNC share pathnames, which allows...

    CVSS7.1Published13 Aug 2008
  10. 26%

    Outlook Express 6.0, when sending multipart e-mail messages using the "Break apart messages larger than" setting, leaks the BCC recipients of the message to the addresses listed in the To and CC fields, which may...

    CVSS5.0Published31 Dec 2004
Precursor Intelligence

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We track 45 published vulnerabilities listed under the name Outlook Express, across 22 versions.

None of Outlook Express's vulnerabilities is on the list of flaws known to be exploited today.

Microsoft also lists Outlook Express under more specific names, such as Outlook Express Book Control. Flaws listed only under those names are counted on their own pages, not here. Open the release you run to see its own list.

Create a Precursor Intelligence account and track Outlook Express. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook.