How severe is CVE-2002-1831?

CVE-2002-1831 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2002-1831 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 22% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2002-1831?

CVE-2002-1831 primarily affects Microsoft Msn Messenger. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2002-1831?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2002-1831 published?

CVE-2002-1831 was published on 2002-12-31 and last updated on 2026-06-16.

CVE-2002-1831

CVE-2002-1831 is a medium-severity vulnerability in Microsoft Msn Messenger with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 22% places it in the 97th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 22% (97th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Msn Messenger
Published: 2002-12-31
Last modified: 2026-06-16

Description

Microsoft MSN Messenger Service 1.0 through 4.6 allows remote attackers to cause a denial of service (crash) via an invite request that contains hex-encoded spaces (%20) in the Invitation-Cookie field.

Frequently asked questions

What is CVE-2002-1831?: Microsoft MSN Messenger Service 1.0 through 4.6 allows remote attackers to cause a denial of service (crash) via an invite request that contains hex-encoded spaces (%20) in the Invitation-Cookie field.
How severe is CVE-2002-1831?: CVE-2002-1831 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2002-1831 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 22% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2002-1831?: CVE-2002-1831 primarily affects Microsoft Msn Messenger. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2002-1831?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2002-1831 published?: CVE-2002-1831 was published on 2002-12-31 and last updated on 2026-06-16.

References

Affected products (8)

cpe:2.3:a:microsoft:msn_messenger:1.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:msn_messenger:2.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:msn_messenger:2.2:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:msn_messenger:3.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:msn_messenger:3.6:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:msn_messenger:4.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:msn_messenger:4.5:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:msn_messenger:4.6:*:*:*:*:*:*:*

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