CVE-2002-1831

Exp

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.

Published: 2002-12-31 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2002-1831 is rated High Exploit Risk (74.1/100): CVSS Medium severity, with high exploitation likelihood (EPSS 22.83%, 97th percentile). 2 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +12.46% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2002-1831

EDB-ID Source Kind Published Link
21481 exploit_db edb 2002-05-24 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2002-1831

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 10.37% 22.83% +12.46%
2 2025-10-24 11.65% 10.37% -1.28%
3 2025-07-27 — 11.65% —

Full EPSS history (22 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2002-1831

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2002-1831

Affected software / configurations for CVE-2002-1831

Vendor Product Version Raw CPE
microsoft msn_messenger 1.0 cpe:2.3:a:microsoft:msn_messenger:1.0:*:*:*:*:*:*:*
microsoft msn_messenger 2.0 cpe:2.3:a:microsoft:msn_messenger:2.0:*:*:*:*:*:*:*
microsoft msn_messenger 2.2 cpe:2.3:a:microsoft:msn_messenger:2.2:*:*:*:*:*:*:*
microsoft msn_messenger 3.0 cpe:2.3:a:microsoft:msn_messenger:3.0:*:*:*:*:*:*:*
microsoft msn_messenger 3.6 cpe:2.3:a:microsoft:msn_messenger:3.6:*:*:*:*:*:*:*
microsoft msn_messenger 4.0 cpe:2.3:a:microsoft:msn_messenger:4.0:*:*:*:*:*:*:*
microsoft msn_messenger 4.5 cpe:2.3:a:microsoft:msn_messenger:4.5:*:*:*:*:*:*:*
microsoft msn_messenger 4.6 cpe:2.3:a:microsoft:msn_messenger:4.6:*:*:*:*:*:*:*

References for CVE-2002-1831

cvelogic Threat Intelligence