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Servers and applications

CVE-2021-30640

A vulnerability in the JNDI Realm of Apache Tomcat allows an attacker to authenticate using variations of a valid user name and/or to bypass some of the protection provided by the LockOut Realm. This issue affects Apache Tomcat 10.0.0-M1 to 10.0.5; 9.0.0.M1 to 9.0.45; 8.5.0 to 8.5.65.

Severity
Medium 6.5
Published
12 Jul 2021
Last changed
8 Oct 2026
Added to UpHeron
21 Oct 2026
Fixed in
7.0.109, 8.5.66, 9.0.46, 10.0.6
Sources
NVD

Affected software

SoftwareAffected versions
Apache TomcatServers and applications · cpe:a:apache:tomcat
  • From 7.0.0 before 7.0.109
  • From 8.5.0 before 8.5.66
  • From 9.0.0 before 9.0.46
  • From 10.0.0 before 10.0.6

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-30640
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-30640