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CVE-2021-38294

84
FAUCET Score

CVE-2021-38294 is a critical command injection vulnerability in Apache Storm versions 2.x prior to 2.2.1 and 1.x prior to 1.2.4. This flaw, residing in the getTopologyHistory service, allows an unauthenticated attacker to achieve Remote Code Execution (RCE) on the Nimbus server via a specially crafted Thrift request. With a CVSS score of 9.8 (Critical), it presents a severe risk due to its network-based attack vector, low attack complexity, and complete compromise of confidentiality, integrity, and availability. While not listed on CISA's KEV, a Metasploit module exists, indicating readily available exploit code, though community discussion and media coverage are currently minimal.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.0.0, < 1.2.4CPE matchmatch criteria
cpe:2.3:a:apache:storm:*:*:*:*:*:*:*:*
>= 2.1.0, < 2.1.1CPE matchmatch criteria
cpe:2.3:a:apache:storm:*:*:*:*:*:*:*:*
>= 2.2.0, < 2.2.1CPE matchmatch criteria
cpe:2.3:a:apache:storm:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
84.49%
Probability of exploitation in next 30 days
EPSS Percentile
99.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Metasploit: Apache Storm Nimbus getTopologyHistory Unauthenticated Command Execution · Oct 25, 2021
This CVE's current EPSS score of 0.8449 is in the 98th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

mavenpatch availablevia ghsa
Product: org.apache.storm:stormFixed in: 2.2.1
mavenpatch availablevia ghsa
Product: org.apache.storm:stormFixed in: 2.1.1
mavenpatch availablevia ghsa
Product: org.apache.storm:stormFixed in: 1.2.4

Vendor Advisories (1)

mavenGHSA-6768-mcjc-8223critical

Command injection leading to Remote Code Execution in Apache Storm

Oct 27, 2021

References

packetstormsecurity.com / files/165019/Apache-Storm-Nimbus-2.2.0-Command-Execution.html
ExploitThird Party AdvisoryVDB Entry
lists.apache.org / thread.html/r5fe881f6ca883908b7a0f005d35115af49f43beea7a8b0915e377859%40%3Cuser.storm.apache.org%3E
Mailing ListVendor Advisory
seclists.org / oss-sec/2021/q4/44
Mailing ListThird Party Advisory