Is CVE-2009-2435 being actively exploited?

CVE-2009-2435 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2009-2435?

CVE-2009-2435 has a CVSS 2.0 base score of 5.0 (MEDIUM).

CVE-2009-2435

MEDIUM · CVSS 5.0EPSS 1.1%EU EUVD

The Sametime server in IBM Lotus Instant Messaging and Web Conferencing 6.5.1 generates error messages for a failed logon attempt with different time delays depending on whether the user account exists, which allows remote attackers to enumerate valid usernames.

Key facts

CVSS score: 5.0 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:L/Au:N/C:P/I:N/A:N
Weakness (CWE): CWE-255
EPSS score: 1.1% (65th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2009-2430)
Published: July 13, 2009
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2009-2430 in the EU Vulnerability Database. Last updated in EUVD on September 17, 2024.

View on the EU Vulnerability Database

Affected products

ibm / lotus instant messaging and web conferencing

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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