Home/CVE/A vulnerability in the JNDI Realm of Apache Tomcat allows an attacker to authenticate using variations of a valid user n
CVE

CVE-2021-30640

A vulnerability in the JNDI Realm of Apache Tomcat allows an attacker to authenticate using variations of a valid user n

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.

MEDIUM · CVSS 6.5 EPSS 0.00123
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules1 YARA rules0
⬡

Weakness Classification

CWE-116Improper Encoding or Escaping of Output
▤

Affected Products & Versions

10
apache tomcat>= 7.0.0 and < 7.0.109
apache tomcat>= 8.5.0 and < 8.5.66
apache tomcat>= 9.0.0 and < 9.0.46
apache tomcat>= 10.0.0 and < 10.0.6
oracle communications cloud native core policyall versions
oracle communications diameter signaling router>= 8.0.0 and <= 8.5.0
oracle communications pricing design centerall versions
oracle hospitality cruise shipboard property management systemall versions
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Maven org.apache.tomcat:tomcat MODERATE fixed in 10.0.5
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumTomcat WebServer Logs Deleted
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · security@apache.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD12 Jul 2021 · 03:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
⚑

Vendor Advisories

15
suse-csafSUSE-SU-2026:1058-1
suse-csafopenSUSE-SU-2024:11618-1
suse-csafopenSUSE-SU-2024:13441-1
rhsaRHSA-2022:5532Important
rhsaRHSA-2022:1179Important
🔗

References & Sources

9
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://lists.apache.org/thread.html/r59f9ef03929d32120f91f4ea7e6e79edd5688d75d0a9b65fd26d1fe8%40%3Cannounce.tomcat.apache.org%3EMailing ListVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/08/msg00009.htmlMailing ListThird 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
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