CVE-2009-0580
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.
- EPSS
- 94% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-31)
- CWE
- CWE-200
- Published
- Modified
- Record from
- the NVD, synced
Affected
- apache:tomcat
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-w227-xcfx-3pj8 | Maven | org.apache.tomcat:tomcat | >=4.1.0 <4.1.40 | 4.1.40 |
| GHSA-w227-xcfx-3pj8 | Maven | org.apache.tomcat:tomcat | >=5.0.0 <5.5.28 | 5.5.28 |
| GHSA-w227-xcfx-3pj8 | Maven | org.apache.tomcat:tomcat | >=6.0.0 <6.0.19 | 6.0.19 |