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NVD / CVE Program· CNA apache

CVE-2021-38294: Shell Command Injection Vulnerability in Nimbus Thrift Server

Noroxi assessment

Priority: This week (action score 64/100)

  • A ready-made attack module is public (Metasploit); exploiting it takes no special expertise.
  • Probability of exploitation in the next 30 days: 83.8% (FIRST EPSS); higher than 99.6% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Apache Software Foundation Apache Storm v2.1.1, v2.2.1, v2.3.0.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Don’t wait for the next maintenance window. Upgrade to Apache Software Foundation Apache Storm v2.1.1, v2.2.1, v2.3.0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

CriticalCVSS 9.8 · v3.1—Weaponized Fix available
Published
Oct 25, 2021
Updated
Jun 17, 2026
EPSS
83.8% · 99th percentile

Report tools

JSON

Action score

64

This week

Don’t wait for the next maintenance window.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
25 / 30 · 83.8%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Weaponized exploit exists
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
apachestorm

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apache storm1.0.0 and later · before 1.2.4
  • apache storm2.1.0 and later · before 2.1.1
  • apache storm2.2.0 and later · before 2.2.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.

  • Apache Software Foundation Apache Storm

    • v1.0.0 and later · before Apache Storm*affected
    • Apache Storm and later · before v1.2.4affectedfixed in v2.1.1, v2.2.1, v2.3.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Mavenorg.apache.storm:stormfrom 1.0.0 · before 1.2.41.2.4
Mavenorg.apache.storm:stormfrom 2.0.0 · before 2.1.12.1.1
Mavenorg.apache.storm:stormfrom 2.2.0 · before 2.2.12.2.1

Same product

apache: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-40865Unsafe Pre-Authentication Deserialization In Workers
    58Plan
  • CVE-2015-3188The UI daemon in Apache Storm 0.10.0 before 0.10.0-beta1 allows remote attackers to execute arbitrary code via unspecified vectors.
    43Plan
  • CVE-2018-11779In Apache Storm versions 1.1.0 to 1.2.2, when the user is using the storm-kafka-client or storm-kafka modules, it is possible to cause the S
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2018-1331Jul 10, 2018 · In Apache Storm 0.10.0 through 0.10.2, 1.0.0 through 1.0.6, 1.1.0 through 1.1.2, and 1.2.0 through 1.2.1, an attacker with access to a secur
    36Monitor
  • ← EarlierCVE-2019-0202Jul 25, 2019 · The Apache Storm Logviewer daemon exposes HTTP-accessible endpoints to read/search log files on hosts running Storm.
    31Monitor
  • Later →CVE-2023-43123Nov 23, 2023 · Apache Storm: Local Information Disclosure Vulnerability in Storm-core on Unix-Like systems due temporary files
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Apache Software Foundation Apache Stormv2.1.1Vendor (CNA)
Apache Software Foundation Apache Stormv2.2.1Vendor (CNA)
Apache Software Foundation Apache Stormv2.3.0Vendor (CNA)
Maven:org.apache.storm:storm1.2.4Package registry (OSV)
Maven:org.apache.storm:storm2.1.1Package registry (OSV)
Maven:org.apache.storm:storm2.2.1Package registry (OSV)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Metasploit module ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Metasploit moduleexploit/linux/misc/nimbus_gettopologyhistory_cmd_execApache Storm Nimbus getTopologyHistory Unauthenticated Command Executionexploit2021-10-25

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Metasploitsame day
  2. Published
  3. TodayNov 7, 2026+1839 d

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-74 · Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records