VULNERABILITY INTELLIGENCE
CVE-2009-0580
CVSS score4.3 MEDIUM
EPSS probability94.44%
CISA KEVNot currently listed
Published2009-06-05
Last modified2026-06-16
CVSS vectorAV:N/AC:M/Au:N/C:P/I:N/A:N
Description
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.
Weakness classification
- CWE-200: Exposure of Sensitive Information to an Unauthorized Actor