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.
2009-06-05T16:00:00.233
2025-04-09T00:30:58.490
Deferred
CVSSv2: 4.3 (MEDIUM)
AV:N/AC:M/Au:N/C:P/I:N/A:N
8.6
2.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | apache | tomcat | 4.1.0 | Yes |
| Application | apache | tomcat | 4.1.1 | Yes |
| Application | apache | tomcat | 4.1.2 | Yes |
| Application | apache | tomcat | 4.1.3 | Yes |
| Application | apache | tomcat | 4.1.3 | Yes |
| Application | apache | tomcat | 4.1.4 | Yes |
| Application | apache | tomcat | 4.1.5 | Yes |
| Application | apache | tomcat | 4.1.6 | Yes |
| Application | apache | tomcat | 4.1.7 | Yes |
| Application | apache | tomcat | 4.1.8 | Yes |
| Application | apache | tomcat | 4.1.9 | Yes |
| Application | apache | tomcat | 4.1.9 | Yes |
| Application | apache | tomcat | 4.1.10 | Yes |
| Application | apache | tomcat | 4.1.11 | Yes |
| Application | apache | tomcat | 4.1.12 | Yes |
| Application | apache | tomcat | 4.1.13 | Yes |
| Application | apache | tomcat | 4.1.14 | Yes |
| Application | apache | tomcat | 4.1.15 | Yes |
| Application | apache | tomcat | 4.1.16 | Yes |
| Application | apache | tomcat | 4.1.17 | Yes |
| Application | apache | tomcat | 4.1.18 | Yes |
| Application | apache | tomcat | 4.1.19 | Yes |
| Application | apache | tomcat | 4.1.20 | Yes |
| Application | apache | tomcat | 4.1.21 | Yes |
| Application | apache | tomcat | 4.1.22 | Yes |
| Application | apache | tomcat | 4.1.23 | Yes |
| Application | apache | tomcat | 4.1.24 | Yes |
| Application | apache | tomcat | 4.1.25 | Yes |
| Application | apache | tomcat | 4.1.26 | Yes |
| Application | apache | tomcat | 4.1.27 | Yes |
| Application | apache | tomcat | 4.1.28 | Yes |
| Application | apache | tomcat | 4.1.29 | Yes |
| Application | apache | tomcat | 4.1.30 | Yes |
| Application | apache | tomcat | 4.1.31 | Yes |
| Application | apache | tomcat | 4.1.32 | Yes |
| Application | apache | tomcat | 4.1.33 | Yes |
| Application | apache | tomcat | 4.1.34 | Yes |
| Application | apache | tomcat | 4.1.35 | Yes |
| Application | apache | tomcat | 4.1.36 | Yes |
| Application | apache | tomcat | 4.1.37 | Yes |
| Application | apache | tomcat | 4.1.38 | Yes |
| Application | apache | tomcat | 4.1.39 | Yes |
| Application | apache | tomcat | 5.5.0 | Yes |
| Application | apache | tomcat | 5.5.1 | Yes |
| Application | apache | tomcat | 5.5.2 | Yes |
| Application | apache | tomcat | 5.5.3 | Yes |
| Application | apache | tomcat | 5.5.4 | Yes |
| Application | apache | tomcat | 5.5.5 | Yes |
| Application | apache | tomcat | 5.5.6 | Yes |
| Application | apache | tomcat | 5.5.7 | Yes |
| Application | apache | tomcat | 5.5.8 | Yes |
| Application | apache | tomcat | 5.5.9 | Yes |
| Application | apache | tomcat | 5.5.10 | Yes |
| Application | apache | tomcat | 5.5.11 | Yes |
| Application | apache | tomcat | 5.5.12 | Yes |
| Application | apache | tomcat | 5.5.13 | Yes |
| Application | apache | tomcat | 5.5.14 | Yes |
| Application | apache | tomcat | 5.5.15 | Yes |
| Application | apache | tomcat | 5.5.16 | Yes |
| Application | apache | tomcat | 5.5.17 | Yes |
| Application | apache | tomcat | 5.5.18 | Yes |
| Application | apache | tomcat | 5.5.19 | Yes |
| Application | apache | tomcat | 5.5.20 | Yes |
| Application | apache | tomcat | 5.5.21 | Yes |
| Application | apache | tomcat | 5.5.22 | Yes |
| Application | apache | tomcat | 5.5.23 | Yes |
| Application | apache | tomcat | 5.5.24 | Yes |
| Application | apache | tomcat | 5.5.25 | Yes |
| Application | apache | tomcat | 5.5.26 | Yes |
| Application | apache | tomcat | 5.5.27 | Yes |
| Application | apache | tomcat | 6.0.0 | Yes |
| Application | apache | tomcat | 6.0.1 | Yes |
| Application | apache | tomcat | 6.0.2 | Yes |
| Application | apache | tomcat | 6.0.3 | Yes |
| Application | apache | tomcat | 6.0.4 | Yes |
| Application | apache | tomcat | 6.0.5 | Yes |
| Application | apache | tomcat | 6.0.6 | Yes |
| Application | apache | tomcat | 6.0.7 | Yes |
| Application | apache | tomcat | 6.0.8 | Yes |
| Application | apache | tomcat | 6.0.9 | Yes |
| Application | apache | tomcat | 6.0.10 | Yes |
| Application | apache | tomcat | 6.0.11 | Yes |
| Application | apache | tomcat | 6.0.12 | Yes |
| Application | apache | tomcat | 6.0.13 | Yes |
| Application | apache | tomcat | 6.0.14 | Yes |
| Application | apache | tomcat | 6.0.15 | Yes |
| Application | apache | tomcat | 6.0.16 | Yes |