CVE-2021-38294

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 82.1%, top 1% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Weaponized
9.8
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 84%
CISA-KEV: Not listedEPSS: 84%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A Command Injection vulnerability exists in the getTopologyHistory service of the Apache Storm 2.x prior to 2.2.1 and Apache Storm 1.x prior to 1.2.4. A specially crafted thrift request to the Nimbus server allows Remote Code Execution (RCE) prior to authentication.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
99.7%
KEV
Not listed

Published

October 25, 2021

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Jul 11, 2026
No patch confirmed yet.
generic

oss-sec: CVE-2021-38294: Apache Storm: Shell Command Injection Vulnerability in Nimbus Thrift Server

https://seclists.org/oss-sec/2021/q4/44
generic
https://lists.apache.org/thread.html/r5fe881f6ca883908b7a0f005d35115af49f43beea7a8b0915e377859%40%3Cuser.storm.apache.org%3E

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
org.apache.storm:storm1.0.0 ... 1.2.3 (15 versions)1.2.4—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 19× 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. 2026-07-12 05:44 UTCEPSS rescore
  2. 2026-07-12 05:44 UTCEPSS rescore
  3. 2026-07-11 08:25 UTCEPSS rescore
  4. 2026-07-11 08:25 UTCEPSS rescore
  5. 2026-07-05 02:28 UTCEPSS rescore
  6. 2026-07-05 02:28 UTCEPSS rescore
  7. 2026-06-30 08:30 UTCOSV refresh
  8. 2026-06-28 04:54 UTCEPSS rescore
  9. 2026-06-28 04:54 UTCEPSS rescore
  10. 2026-06-25 13:48 UTCEPSS rescore
  11. 2026-06-25 13:48 UTCEPSS rescore
  12. 2026-06-23 21:31 UTCEPSS rescore
  13. 2026-06-23 21:31 UTCEPSS rescore
  14. 2026-06-21 14:55 UTCEPSS rescore
  15. 2026-06-17 17:51 UTCEPSS rescore
  16. 2026-06-15 17:46 UTCEPSS rescore
  17. 2026-06-12 23:10 UTCEPSS rescore
  18. 2026-06-12 23:10 UTCEPSS rescore
  19. 2026-06-12 18:10 UTCOSV refresh
  20. 2026-06-10 22:16 UTCEPSS rescore
  21. 2026-06-10 13:20 UTCEPSS rescore
  22. 2026-06-08 14:15 UTCEPSS rescore
  23. 2026-06-08 14:15 UTCEPSS rescore
  24. 2026-06-07 15:23 UTCEPSS rescore
  25. 2026-06-07 15:23 UTCEPSS rescore
Show 14 more
  1. 2026-06-06 13:46 UTCEPSS rescore
  2. 2026-06-06 13:46 UTCEPSS rescore
  3. 2026-06-06 13:46 UTCEPSS rescore
  4. 2026-06-05 22:45 UTCEPSS rescore
  5. 2026-06-05 06:09 UTCEPSS rescore
  6. 2026-06-05 06:09 UTCEPSS rescore
  7. 2026-05-31 00:15 UTCEPSS rescore
  8. 2026-05-31 00:15 UTCEPSS rescore
  9. 2026-05-28 13:43 UTCEPSS rescore
  10. 2026-05-28 13:43 UTCEPSS rescore
  11. 2026-05-27 13:39 UTCEPSS rescore
  12. 2026-05-27 13:39 UTCEPSS rescore
  13. 2026-05-27 13:39 UTCEPSS rescore
  14. 2026-05-26 08:32 UTCEG score recompute

Publicly available exploits

(1 reference)

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/misc/nimbus_gettopologyhistory_cmd_exec✓ verified
    First seen Oct 25, 2021

    Apache Storm Nimbus getTopologyHistory Unauthenticated Command Execution

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-38294?
CVE-2021-38294 is a critical vulnerability published on October 25, 2021. A Command Injection vulnerability exists in the getTopologyHistory service of the Apache Storm 2.x prior to 2.2.1 and Apache Storm 1.x prior to 1.2.4. A specially crafted thrift request to the Nimbus server allows Remote Code Execution (RCE) prior to authentication.
When was CVE-2021-38294 disclosed?
CVE-2021-38294 was first published in the National Vulnerability Database on October 25, 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-2021-38294 actively exploited?
CVE-2021-38294 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-38294?
CVE-2021-38294 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-38294?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-38294, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-38294

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