Which products and versions are affected by CVE-2007-3897?

Affected: Outlook Express (Microsoft) versions 6.0-sp1; Windows Mail (Microsoft). The full list is in the CVE brief.

Is CVE-2007-3897 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2007-3897 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2007-3897?

No public exploit code is known.

Is there a fix for CVE-2007-3897?

Fixed versions are available, including Outlook Express 6.0.

How urgently should CVE-2007-3897 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2007-3897

Critical

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 trigger memory corruption.

Published Oct 9, 2007 · Updated Apr 22, 2026

Key Facts

Patch immediately

CVE-2007-3897 is a critical-severity vulnerability (CVSS 9.3 v2) affecting Outlook Express (Microsoft), Windows Mail (Microsoft).
It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
EPSS estimates a 55% probability of exploitation in the next 30 days.
Fixed versions are available, including Outlook Express 6.0.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v2

9.3

AV:N/AC:M/Au:N/C:C/I:C/A:C

EPSS (30-day exploit likelihood)

55%

Higher than 99.0% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

None known

Get the full CVE-2007-3897 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Affected Products

3 affected entries in total

Product	Affected versions	Fixed in
Outlook ExpressMicrosoft	6.0-sp1	6.0
Windows MailMicrosoft	See advisory	n/a

Patched Releases

Outlook Express

6.0

Timeline

Publicly disclosed
Oct 9, 2007
Last updated
Apr 22, 2026

Weakness Type

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

advisory27112
advisory1018785
advisory1018786
advisoryoval:org.mitre.oval:def:1706
advisory20071010 Re: iDefense Security Advisory 10.09.07: Microsoft Windows Mail and Outlook Express NNTP Protocol Heap Overflow

6 more references in the full CVE brief

FAQ

Common Questions.

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 trigger memory corruption.
Affected: Outlook Express (Microsoft) versions 6.0-sp1; 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.
No public exploit code is known.
Fixed versions are available, including Outlook Express 6.0.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Is CVE-2007-3897 Running On Your Attack Surface?

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