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CVE-2021-21307

Remote Code Exploit in Lucee Admin

CRITICAL
9.8
CVSS Score
Published: February 11, 2021 at 06:20 PM UTC
Updated: June 17, 2026 at 03:35 AM UTC
1 product affected across 1 vendorLucee Server

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Severity
CRITICAL9.8
Exploit prediction
EPSS 89%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Lucee Server· Lucee
95%
v < 5.3.5.96v < 5.3.6.68v < 5.3.7.475.3.5.00 ≤ v < 5.3.5.965.3.6.00 ≤ v < 5.3.6.685.3.7.00 ≤ v < 5.3.7.47
Affected range stops below 5.3.5.96, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.3.6.68, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.3.7.47, so it looks safe — our inference, not a vendor statement

References (7)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
http://ciacfug.org/blog/updating-lucee-as-part-of-a-vulnerability-alert-response
x_refsource_MISCExploitThird Party AdvisoryVDB Entry
Source: [email protected]
http://packetstormsecurity.com/files/163864/Lucee-Administrator-imgProcess.cfm-Arbitrary-File-Write.html
x_refsource_MISCVendor Advisory
Source: [email protected]
https://dev.lucee.org/t/lucee-vulnerability-alert-november-2020/7643
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://github.com/httpvoid/writeups/blob/main/Apple-RCE.md
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/lucee/Lucee/commit/6208ab7c44c61d26c79e0b0af10382899f57e1ca
x_refsource_CONFIRMProduct
Source: [email protected]
https://github.com/lucee/Lucee/security/advisories/GHSA-2xvv-723c-8p7r
x_refsource_MISCPress/Media CoverageThird Party Advisory
Source: [email protected]
https://portswigger.net/daily-swig/security-researchers-earn-50k-after-exposing-critical-flaw-in-apple-travel-portal

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-862

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