CVE-2021-21307 (GCVE-0-2021-21307)

Vulnerability from cvelistv5 – Published: 2021-02-11 18:20 – Updated: 2024-08-03 18:09
VLAI Shadowserver KEVIntel
Title
Remote Code Exploit in Lucee Admin
Summary
Lucee Server is a dynamic, Java based (JSR-223), tag and scripting language used for rapid web application development. In Lucee Admin before versions 5.3.7.47, 5.3.6.68 or 5.3.5.96 there is an unauthenticated remote code exploit. This is fixed in versions 5.3.7.47, 5.3.6.68 or 5.3.5.96. As a workaround, one can block access to the Lucee Administrator.
Severity
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
CWE
Assigner
References
Impacted products
Vendor Product Version
lucee Lucee Affected: >= 5.3.5.0, < 5.3.5.96
Affected: >= 5.3.6.0, < 5.3.6.68
Affected: >= 5.3.7.0, < 5.3.7.47
Create a notification for this product.
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: a9dd0ead-f611-4fa8-8f2b-5a65a0fe8da8

Vulnerability ID: CVE-2021-21307

Status: Confirmed

Status Updated: 2026-07-06 00:00 UTC

Exploited: Yes

Characteristics
Severity: 98.0
Timestamps
First Seen: 2023-10-14
Asserted: 2023-10-14
Last Seen: 2026-07-06
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Lucee / Lucee Server | Class: web-app-framework | Severity: Critical (CVSS 9.8) | IoT: no | In CISA KEV: no | Honeypot connections on 2026-07-06: 16
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class web-app-framework
7D Avg 1
Vendor Lucee
30D Avg 6
90D Avg 4
Product Lucee Server
Cisa Kev no
Connections 16
Observation Date 2026-07-06
Vulnerability Class CVSS
Vulnerability Score 9.8
Vulnerability Severity Critical
References
Created: 2026-06-30 09:23 UTC | Updated: 2026-07-08 01:04 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: acb6763a-a095-489c-848c-583da28b3661

Vulnerability ID: CVE-2021-21307

Status: Confirmed

Status Updated: 2025-04-22 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2025-04-22
Asserted: 2025-04-22
Scope
Notes: KEVIntel entry: Remote Code Exploit in Lucee Admin | Affected: lucee / Lucee | CVSS: 8.6 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Remote Code Exploit in Lucee Admin
Vendor lucee
Product Lucee
Added Date 2025-04-22T00:00:00.000Z
Cvss Score 8.6
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-06-23 14:04 UTC | Updated: 2026-06-23 14:04 UTC
Show details on NVD website
To clipboard 

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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-21307\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2021-02-11T19:15:13.313\",\"lastModified\":\"2024-11-21T05:47:59.323\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Lucee Server is a dynamic, Java based (JSR-223), tag and scripting language used for rapid web application development. In Lucee Admin before versions 5.3.7.47, 5.3.6.68 or 5.3.5.96 there is an unauthenticated remote code exploit. This is fixed in versions 5.3.7.47, 5.3.6.68 or 5.3.5.96. As a workaround, one can block access to the Lucee Administrator.\"},{\"lang\":\"es\",\"value\":\"Lucee Server es un lenguaje din\u00e1mico, de etiquetado y scripting de comandos basado en Java (JSR-223) que es utilizado para el desarrollo r\u00e1pido de aplicaciones web.\u0026#xa0;En Lucee Admin anterior a versiones 5.3.7.47, 5.3.6.68 o 5.3.5.96 se presenta una explotaci\u00f3n de c\u00f3digo remota no autenticada.\u0026#xa0;Esto es corregido en las versiones 5.3.7.47, 5.3.6.68 o 5.3.5.96.\u0026#xa0;Como soluci\u00f3n alternativa, se puede bloquear el acceso a Lucee Administrator\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N\",\"baseScore\":8.6,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":4.0},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:P/I:P/A:P\",\"baseScore\":7.5,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"PARTIAL\"},\"baseSeverity\":\"HIGH\",\"exploitabilityScore\":10.0,\"impactScore\":6.4,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-862\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:lucee:lucee_server:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.3.5.00\",\"versionEndExcluding\":\"5.3.5.96\",\"matchCriteriaId\":\"F63963E7-D380-493F-B75B-4FBCDD646D97\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:lucee:lucee_server:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.3.6.00\",\"versionEndExcluding\":\"5.3.6.68\",\"matchCriteriaId\":\"3653F1B9-18A4-4AA2-906E-C74FD9FF0611\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:lucee:lucee_server:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.3.7.00\",\"versionEndExcluding\":\"5.3.7.47\",\"matchCriteriaId\":\"9ED241BC-C6BA-4DBC-BD08-3FC8A529350E\"}]}]}],\"references\":[{\"url\":\"http://ciacfug.org/blog/updating-lucee-as-part-of-a-vulnerability-alert-response\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"http://packetstormsecurity.com/files/163864/Lucee-Administrator-imgProcess.cfm-Arbitrary-File-Write.html\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Exploit\",\"Third Party Advisory\",\"VDB Entry\"]},{\"url\":\"https://dev.lucee.org/t/lucee-vulnerability-alert-november-2020/7643\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://github.com/httpvoid/writeups/blob/main/Apple-RCE.md\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Exploit\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/lucee/Lucee/commit/6208ab7c44c61d26c79e0b0af10382899f57e1ca\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/lucee/Lucee/security/advisories/GHSA-2xvv-723c-8p7r\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Product\"]},{\"url\":\"https://portswigger.net/daily-swig/security-researchers-earn-50k-after-exposing-critical-flaw-in-apple-travel-portal\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Press/Media Coverage\",\"Third Party Advisory\"]},{\"url\":\"http://ciacfug.org/blog/updating-lucee-as-part-of-a-vulnerability-alert-response\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"http://packetstormsecurity.com/files/163864/Lucee-Administrator-imgProcess.cfm-Arbitrary-File-Write.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Third Party Advisory\",\"VDB Entry\"]},{\"url\":\"https://dev.lucee.org/t/lucee-vulnerability-alert-november-2020/7643\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://github.com/httpvoid/writeups/blob/main/Apple-RCE.md\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/lucee/Lucee/commit/6208ab7c44c61d26c79e0b0af10382899f57e1ca\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/lucee/Lucee/security/advisories/GHSA-2xvv-723c-8p7r\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Product\"]},{\"url\":\"https://portswigger.net/daily-swig/security-researchers-earn-50k-after-exposing-critical-flaw-in-apple-travel-portal\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Press/Media Coverage\",\"Third Party Advisory\"]}]}}"
  }
}


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Tags
Taxonomy of the tags.





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

Author Source Type Date Other

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.