CVE-2021-40865

Name: CVE-2021-40865
Creator: NVD / NIST
Published: 2021-10-25T13:15:08.14+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 65.59%

Last modified Jun 17, 2026

CVE-2021-40865 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 65.59% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

65.59%

99.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apache	Storm	>= 1.0.0, < 1.2.4
Apache	Storm	>= 2.1.0, < 2.1.1
Apache	Storm	>= 2.2.0, < 2.2.1

References

https://lists.apache.org/thread.html/r8d45e74299897b6734dd0f788c46a631009ce2eeb731523386f7a253%40%3Cuser.storm.apache.org%3EMailing List, Vendor Advisory
https://seclists.org/oss-sec/2021/q4/45Mailing List, Third Party Advisory
https://lists.apache.org/thread.html/r8d45e74299897b6734dd0f788c46a631009ce2eeb731523386f7a253%40%3Cuser.storm.apache.org%3EMailing List, Vendor Advisory
https://seclists.org/oss-sec/2021/q4/45Mailing List, Third Party Advisory

Timeline

Published: Oct 25, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-40865?

How severe is CVE-2021-40865?

CVE-2021-40865 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 65.59% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40865?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-40865?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST