How severe is CVE-2009-2435?

CVE-2009-2435 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-2435 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-2435?

CVE-2009-2435 affects Ibm Lotus Instant Messaging And Web Conferencing. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2009-2435?

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

When was CVE-2009-2435 published?

CVE-2009-2435 was published on 2009-07-13 and last updated on 2026-06-16.

CVE-2009-2435

CVE-2009-2435 is a medium-severity vulnerability in Ibm Lotus Instant Messaging And Web Conferencing with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-255.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-255
Affected product: Ibm Lotus Instant Messaging And Web Conferencing
Published: 2009-07-13
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2009-2435?: 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.
How severe is CVE-2009-2435?: CVE-2009-2435 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-2435 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-2435?: CVE-2009-2435 affects Ibm Lotus Instant Messaging And Web Conferencing. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2009-2435?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-2435 published?: CVE-2009-2435 was published on 2009-07-13 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:ibm:lotus_instant_messaging_and_web_conferencing:6.5.1:*:*:*:*:*:*:*

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