How severe is CVE-2006-4021?

CVE-2006-4021 has a CVSS 2.0 base score of 2.6, rated low severity.

Is CVE-2006-4021 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2006-4021?

CVE-2006-4021 affects Scatterchat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2006-4021?

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

When was CVE-2006-4021 published?

CVE-2006-4021 was published on 2006-08-17 and last updated on 2026-06-16.

CVE-2006-4021

CVE-2006-4021 is a low-severity vulnerability in Scatterchat with a CVSS 2.0 base score of 2.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Low (CVSS 2.0 base score 2.6)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Scatterchat
Published: 2006-08-17
Last modified: 2026-06-16

Description

The cryptographic module in ScatterChat 1.0.x allows attackers to identify patterns in large numbers of messages by identifying collisions using a birthday attack on the custom padding mechanism for ECB mode encryption.

Frequently asked questions

What is CVE-2006-4021?: The cryptographic module in ScatterChat 1.0.x allows attackers to identify patterns in large numbers of messages by identifying collisions using a birthday attack on the custom padding mechanism for ECB mode encryption.
How severe is CVE-2006-4021?: CVE-2006-4021 has a CVSS 2.0 base score of 2.6, rated low severity.
Is CVE-2006-4021 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-4021?: CVE-2006-4021 affects Scatterchat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2006-4021?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2006-4021 published?: CVE-2006-4021 was published on 2006-08-17 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:scatterchat:scatterchat:1.0.1:*:*:*:*:*:*:*

More vulnerabilities in Scatterchat

CVE-2006-4508 — Medium (CVSS 4.0): Unspecified vulnerability in (1) Tor 0.1.0.x before 0.1.0.18 and 0.1.1.x before 0.1.1.23, and (2) ScatterChat before…

All CVEs affecting Scatterchat →