CVE-2021-21307
CVE-2021-21307 is a high-severity vulnerability in Lucee Lucee Server with a CVSS 3.x base score of 8.6. Its EPSS exploit-prediction score of 89% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-862.
Key facts
- Severity: High (CVSS 3.x base score 8.6)
- CVSS v2: 7.5
- EPSS exploit prediction: 89% (100th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-862
- Affected product: Lucee Lucee Server
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2021-21307?
- 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.
- How severe is CVE-2021-21307?
- CVE-2021-21307 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
- Is CVE-2021-21307 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 89% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-21307?
- CVE-2021-21307 affects Lucee Lucee Server. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-21307?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-21307 published?
- CVE-2021-21307 was published on 2021-02-11 and last updated on 2026-06-17.
References
- http://ciacfug.org/blog/updating-lucee-as-part-of-a-vulnerability-alert-response
- http://packetstormsecurity.com/files/163864/Lucee-Administrator-imgProcess.cfm-Arbitrary-File-Write.html
- https://dev.lucee.org/t/lucee-vulnerability-alert-november-2020/7643
- https://github.com/httpvoid/writeups/blob/main/Apple-RCE.md
- https://github.com/lucee/Lucee/commit/6208ab7c44c61d26c79e0b0af10382899f57e1ca
- https://github.com/lucee/Lucee/security/advisories/GHSA-2xvv-723c-8p7r
- https://portswigger.net/daily-swig/security-researchers-earn-50k-after-exposing-critical-flaw-in-apple-travel-portal
Affected products (1)
- cpe:2.3:a:lucee:lucee_server:*:*:*:*:*:*:*:*
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