CVE-2021-21307

CRITICALNVD 8.69.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because EPSS predicts 89% probability of exploitation within the next 30 days (99th percentile of EPSS-scored CVEs). NVD baseline CVSS 8.6 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, nvd
Weaponized
9.0EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 89%
  • Public exploit code is available (Metasploit, epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 89%CVSS: 8.6Exploit: Metasploit · epss top5pct · epss high · public exploitExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
8.6
EG Score
9.0CRITICALhigh confidence
EG Risk
81
EG Risk 81/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation89% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
89%
EPSS %ILE
99th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (EG-KEV: weaponized) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

February 11, 2021

Last Modified

November 21, 2024

Advisory Details (6)

Auto-updated Sep 1, 2026
Patch available. Sources: github_commit, github.
generic

Lucee Vulnerability Alert - November 2020, CVE-2021-21307 - release - Lucee Dev

https://dev.lucee.org/t/lucee-vulnerability-alert-november-2020/7643
generic

Locked Out | Packet Storm

http://packetstormsecurity.com/files/163864/Lucee-Administrator-imgProcess.cfm-Arbitrary-File-Write.html
generic

PortSwigger — Web security tools, training and research

https://portswigger.net/daily-swig/security-researchers-earn-50k-after-exposing-critical-flaw-in-apple-travel-portal
githubMentions a patch (unverified)

Remote Code Exploit in Lucee Admin · Advisory · lucee/Lucee · GitHub

https://github.com/lucee/Lucee/security/advisories/GHSA-2xvv-723c-8p7r
github_commit Patch Available

commit 6208ab7c44c6 (lucee/Lucee)

Patch available: lucee/Lucee 6.0.0.451 (contains commit 6208ab7c44c6)

https://github.com/lucee/Lucee/commit/6208ab7c44c61d26c79e0b0af10382899f57e1ca
generic

writeups/Apple-RCE.md at main · httpvoid/writeups · GitHub

https://github.com/httpvoid/writeups/blob/main/Apple-RCE.md

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 2× in last 7d / 14× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-01 19:46 UTCEPSS rescore
  2. 2026-09-30 15:29 UTCEG score recompute
  3. 2026-09-26 15:54 UTCEPSS rescore
  4. 2026-09-26 15:54 UTCEPSS rescore
  5. 2026-09-26 09:55 UTCOSV refresh
  6. 2026-09-26 00:21 UTCEPSS rescore
  7. 2026-09-24 14:00 UTCEPSS rescore
  8. 2026-09-24 14:00 UTCEPSS rescore
  9. 2026-09-22 14:44 UTCEPSS rescore
  10. 2026-09-21 20:28 UTCEPSS rescore
  11. 2026-09-18 19:23 UTCEPSS rescore
  12. 2026-09-16 14:05 UTCEPSS rescore
  13. 2026-09-16 14:04 UTCEPSS rescore
  14. 2026-09-10 09:29 UTCEPSS rescore
  15. 2026-09-06 22:31 UTCOSV refresh
  16. 2026-09-06 13:44 UTCEPSS rescore
  17. 2026-09-06 13:44 UTCEPSS rescore
  18. 2026-09-05 15:25 UTCEPSS rescore
  19. 2026-09-01 13:50 UTCEPSS rescore
  20. 2026-09-01 03:32 UTCEPSS rescore
  21. 2026-08-30 19:14 UTCEPSS rescore
  22. 2026-08-28 21:37 UTCEPSS rescore
  23. 2026-08-25 13:45 UTCEPSS rescore
  24. 2026-08-21 23:46 UTCEPSS rescore
  25. 2026-08-20 08:31 UTCOSV refresh
Show 56 more
  1. 2026-08-19 17:01 UTCEPSS rescore
  2. 2026-08-17 13:43 UTCEPSS rescore
  3. 2026-08-16 02:11 UTCEPSS rescore
  4. 2026-08-12 13:47 UTCEPSS rescore
  5. 2026-08-05 03:41 UTCOSV refresh
  6. 2026-07-30 16:25 UTCEPSS rescore
  7. 2026-07-24 14:15 UTCEPSS rescore
  8. 2026-07-23 01:57 UTCEG score recompute
  9. 2026-07-22 22:43 UTCEG score recompute
  10. 2026-07-22 14:05 UTCEPSS rescore
  11. 2026-07-21 15:22 UTCEPSS rescore
  12. 2026-07-21 15:22 UTCEPSS rescore
  13. 2026-07-19 01:59 UTCOSV refresh
  14. 2026-07-13 22:27 UTCEPSS rescore
  15. 2026-07-13 22:27 UTCEPSS rescore
  16. 2026-07-13 06:10 UTCEPSS rescore
  17. 2026-07-13 06:10 UTCEPSS rescore
  18. 2026-07-09 19:07 UTCEPSS rescore
  19. 2026-07-04 06:29 UTCEPSS rescore
  20. 2026-07-04 06:29 UTCEPSS rescore
  21. 2026-07-01 08:48 UTCOSV refresh
  22. 2026-06-29 14:04 UTCEPSS rescore
  23. 2026-06-29 14:04 UTCEPSS rescore
  24. 2026-06-28 14:05 UTCEPSS rescore
  25. 2026-06-28 04:54 UTCEPSS rescore
  26. 2026-06-28 04:54 UTCEPSS rescore
  27. 2026-06-24 14:03 UTCEPSS rescore
  28. 2026-06-24 14:03 UTCEPSS rescore
  29. 2026-06-23 21:31 UTCEPSS rescore
  30. 2026-06-23 21:31 UTCEPSS rescore
  31. 2026-06-22 14:24 UTCEPSS rescore
  32. 2026-06-22 14:23 UTCEPSS rescore
  33. 2026-06-15 17:46 UTCEPSS rescore
  34. 2026-06-14 23:15 UTCEPSS rescore
  35. 2026-06-13 22:58 UTCEPSS rescore
  36. 2026-06-13 14:13 UTCOSV refresh
  37. 2026-06-12 23:10 UTCEPSS rescore
  38. 2026-06-12 23:10 UTCEPSS rescore
  39. 2026-06-10 22:16 UTCEPSS rescore
  40. 2026-06-10 22:16 UTCEPSS rescore
  41. 2026-06-06 13:46 UTCEPSS rescore
  42. 2026-06-06 13:46 UTCEPSS rescore
  43. 2026-06-06 13:46 UTCEPSS rescore
  44. 2026-06-05 22:45 UTCEPSS rescore
  45. 2026-06-05 22:45 UTCEPSS rescore
  46. 2026-06-01 13:50 UTCEPSS rescore
  47. 2026-06-01 13:50 UTCEPSS rescore
  48. 2026-05-31 00:15 UTCEPSS rescore
  49. 2026-05-31 00:15 UTCEPSS rescore
  50. 2026-05-29 13:42 UTCEPSS rescore
  51. 2026-05-28 13:43 UTCEPSS rescore
  52. 2026-05-28 13:43 UTCEPSS rescore
  53. 2026-05-26 20:55 UTCEG score recompute
  54. 2026-05-26 13:42 UTCEPSS rescore
  55. 2026-05-26 13:42 UTCEPSS rescore
  56. 2026-05-24 16:49 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 Metasploit module). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Metasploitexploit/linux/http/lucee_admin_imgprocess_file_write✓ verified
    First seen Jan 15, 2021

    Lucee Administrator imgProcess.cfm Arbitrary File Write

    Open source ↗
  • Nucleihttp/cves/2021/CVE-2021-21307.yaml
    First seen Jan 1, 2021

    Lucee Admin - Remote Code Execution

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-21307?
CVE-2021-21307 is a critical vulnerability published on February 11, 2021. 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…
When was CVE-2021-21307 disclosed?
CVE-2021-21307 was first published on February 11, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-21307 actively exploited?
CVE-2021-21307 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 89% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-21307?
CVE-2021-21307 has a CVSS v3 base score of 8.6 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
How do I remediate CVE-2021-21307?
A fix for CVE-2021-21307 is available: update to the fixed version the vendor names in its advisory.

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