How severe is CVE-2007-3897?

CVE-2007-3897 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2007-3897 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 55% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-3897?

CVE-2007-3897 primarily affects Microsoft Outlook Express. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2007-3897?

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-2007-3897 published?

CVE-2007-3897 was published on 2007-10-09 and last updated on 2026-06-16.

CVE-2007-3897

CVE-2007-3897 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 55% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 55% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Microsoft Outlook Express
Published: 2007-10-09
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2007-3897?: 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.
How severe is CVE-2007-3897?: CVE-2007-3897 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2007-3897 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 55% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-3897?: CVE-2007-3897 primarily affects Microsoft Outlook Express. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2007-3897?: 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-2007-3897 published?: CVE-2007-3897 was published on 2007-10-09 and last updated on 2026-06-16.

References

Affected products (3)

cpe:2.3:a:microsoft:outlook_express:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:outlook_express:6.0:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:windows_mail:-:*:*:*:*:vista:*:*

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