CVE-2021-30640 (GCVE-0-2021-30640)

Vulnerability from cvelistv5 – Published: 2021-07-12 14:55 – Updated: 2024-08-03 22:40
VLAI
Title
Auth weakness in JNDIRealm
Summary
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
6.5 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
CWE
  • Authentication weaknees
Assigner
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache Tomcat Affected: Apache Tomcat 10 10.0.0-M1 to 10.0.5
Affected: Apache Tomcat 9 9.0.0.M1 to 9.0.45
Affected: Apache Tomcat 8.5 8.5.0 to 8.5.65
Affected: Apache Tomcat 7 7.0.0 to 7.0.108
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    "redhat_vex": {
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      "current_release_date": "2026-06-28T07:45:55+00:00",
      "cve": "CVE-2021-30640",
      "id": "CVE-2021-30640",
      "initial_release_date": "2021-07-12T00:00:00+00:00",
      "product_status:fixed": "39",
      "product_status:known_affected": "5",
      "product_status:known_not_affected": "30",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "tomcat: JNDI realm authentication weakness",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-30640.json",
      "version": "3"
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.