Which products and versions are affected by CVE-2021-40865?

Affected: Storm (Apache) versions >= v1.0.0; org.apache.storm:storm (maven) versions >= 2.2.0. The full list is in the CVE brief.

Is CVE-2021-40865 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2021-40865 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2021-40865?

No public exploit code is known.

Is there a fix for CVE-2021-40865?

Fixed versions are available, including Storm 1.2.4, Storm Apache Storm *, Storm v1.2.4.

How urgently should CVE-2021-40865 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2021-40865

Critical

Deserialization of Untrusted Data leading to Remote Code Execution in Apache Storm

Published Oct 26, 2021 · Updated Jul 9, 2026 · Also known as GHSA-w729-7633-2fw5

Key Facts

Patch immediately

CVE-2021-40865 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Storm (Apache), org.apache.storm:storm (maven).
It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
EPSS estimates a 64% probability of exploitation in the next 30 days.
Fixed versions are available, including Storm 1.2.4, Storm Apache Storm *, Storm v1.2.4.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v3.1

9.8

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

EPSS (30-day exploit likelihood)

64%

Higher than 99.2% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

None known

Get the full CVE-2021-40865 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

An Unsafe Deserialization vulnerability exists in the worker services of the Apache Storm supervisor server allowing pre-auth Remote Code Execution (RCE). Apache Storm 2.2.x users should upgrade to version 2.2.1 or 2.3.0. Apache Storm 2.1.x users should upgrade to version 2.1.1. Apache Storm 1.x users should upgrade to version 1.2.4

Affected Products

3 affected entries in total

Product	Affected versions	Fixed in
StormApache	>= v1.0.0	1.2.4
org.apache.storm:stormmaven	>= 2.2.0	2.1.1

Patched Releases

Storm

1.2.4, Apache Storm *, v1.2.4

org.apache.storm:storm

1.2.4, 2.1.1, 2.2.1

Timeline

Publicly disclosed
Oct 26, 2021
Last updated
Jul 9, 2026

Weakness Type

CWE-502 Deserialization of Untrusted Data

References

2 more references in the full CVE brief

FAQ

Common Questions.

An Unsafe Deserialization vulnerability exists in the worker services of the Apache Storm supervisor server allowing pre-auth Remote Code Execution (RCE).
Affected: Storm (Apache) versions >= v1.0.0; org.apache.storm:storm (maven) versions >= 2.2.0. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Storm 1.2.4, Storm Apache Storm *, Storm v1.2.4.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Is CVE-2021-40865 Running On Your Attack Surface?

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