Auth bypass in Lucee
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.892 (99.8th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.892 · newest: 0.892 · change: 0.000
Affected products
- Lucee — versions >= 5.3.5.0, < 5.3.5.96, >= 5.3.6.0, < 5.3.6.68, >= 5.3.7.0, < 5.3.7.47
- Lucee Server
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/lucee/Lucee/security/advisories/GHSA-2xvv-723c-8p7r (Product)
- github.com/lucee/Lucee/commit/6208ab7c44c61d26c79e0b0af10382899f57e1ca (Patch, Third Party Advisory)
- dev.lucee.org/t/lucee-vulnerability-alert-november-2020/7643 (Vendor Advisory)
- github.com/httpvoid/writeups/blob/main/Apple-RCE.md (Exploit, Third Party Advisory)
- portswigger.net/daily-swig/security-researchers-earn-50k-after-exposing-critica… (Third Party Advisory, Press/Media Coverage)
- ciacfug.org/blog/updating-lucee-as-part-of-a-vulnerability-alert-response (Patch, Third Party Advisory)
- packetstormsecurity.com/files/163864/Lucee-Administrator-imgProcess.cfm-Arbitra… (Exploit, VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-21307?
- CVE-2021-21307 is a high-severity vulnerability in Lucee, classified under Missing Authorization. CVSS score: 8.6/10. Published 2021-02-11.
- How severe is CVE-2021-21307?
- High severity. CVSS v3 base score is 8.6 out of 10.
- Is CVE-2021-21307 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.