CVE-2021-30640
MEDIUMCVSS 6.5/10EPSS 9.89%
Last modified
CVE-2021-30640 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 9.89% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Apache | Tomcat | >= 7.0.0, < 7.0.109 |
| Apache | Tomcat | >= 8.5.0, < 8.5.66 |
| Apache | Tomcat | >= 9.0.0, < 9.0.46 |
| Apache | Tomcat | >= 10.0.0, < 10.0.6 |
| Oracle | Communications Cloud Native Core Policy | 1.14.0 |
| Oracle | Communications Diameter Signaling Router | >= 8.0.0, <= 8.5.0 |
| Oracle | Communications Pricing Design Center | 12.0.0.3.0 |
| Oracle | Hospitality Cruise Shipboard Property Management System | 20.1.0 |
| Oracle | Tekelec Platform Distribution | >= 7.4.0, <= 7.7.1 |
| Debian | Debian Linux | 9.0 |
| Debian | Debian Linux | 10.0 |
| Debian | Debian Linux | 11.0 |
References
- https://lists.debian.org/debian-lts-announce/2021/08/msg00009.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202208-34Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210827-0007/Third Party Advisory
- https://www.debian.org/security/2021/dsa-4952Third Party Advisory
- https://www.debian.org/security/2021/dsa-4986Third Party Advisory
- https://www.oracle.com//security-alerts/cpujul2021.htmlThird Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/08/msg00009.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202208-34Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210827-0007/Third Party Advisory
- https://www.debian.org/security/2021/dsa-4952Third Party Advisory
- https://www.debian.org/security/2021/dsa-4986Third Party Advisory
- https://www.oracle.com//security-alerts/cpujul2021.htmlThird Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2021-30640?
CVE-2021-30640 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 9.89% probability of exploitation in the next 30 days.
How do I fix CVE-2021-30640?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-30640?
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