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CVE-2009-0580

4.3
CVSS v2.0 Base Score
88.17%
HIGH RiskEPSS (100th percentile)

Apache Tomcat 4.1.0 through 4.1.39, 5.5.0 through 5.5.27, and 6.0.0 through 6.0.18, when FORM authentication is used, allows remote attackers to enumerate valid usernames via requests to /j_security_check with malformed URL encoding of passwords, related to improper error checking in the (1) MemoryRealm, (2) DataSourceRealm, and (3) JDBCRealm authentication realms, as demonstrated by a % (percent) value for the j_password parameter.

Published: 6/5/2009
Modified: 4/23/2026
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Vulnerability Summary

CVSS v2 Score

4.3

AV:N/AC:M/Au:N/C:P/I:N/A:N

EPSS Score (Exploitation Probability)

88.17%HIGH Exploitation Risk
100th percentile

This vulnerability has a 88.17% probability of being exploited in the next 30 days, ranking higher than 100% of all scored CVEs.

CWE Classification

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Same Weakness Type(CWE-200)

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