CVE-2021-41269

CRITICAL

cron-utils < 9.1.6 - Unauthenticated Remote Code Execution via Java EL Expression Injection

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 3 public exploits for CVE-2021-41269. PoCs published by dawetmaster, andikahilmy, shoucheng3.

AI-analyzed exploit summary This repository contains the source code of the vulnerable cron-utils library (version 9.0.1) affected by CVE-2021-41269. The README provides detailed usage examples and technical documentation but does not include an exploit PoC or analysis of the vulnerability itself.

Description

cron-utils is a Java library to define, parse, validate, migrate crons as well as get human readable descriptions for them. In affected versions A template Injection was identified in cron-utils enabling attackers to inject arbitrary Java EL expressions, leading to unauthenticated Remote Code Execution (RCE) vulnerability. Versions up to 9.1.2 are susceptible to this vulnerability. Please note, that only projects using the @Cron annotation to validate untrusted Cron expressions are affected. The issue was patched and a new version was released. Please upgrade to version 9.1.6. There are no known workarounds known.

Exploits (3)

nomisec WRITEUP
by dawetmaster · poc
https://github.com/dawetmaster/CVE-2021-41269-cron-utils-vulnerable

This repository contains the source code of the vulnerable cron-utils library (version 9.0.1) affected by CVE-2021-41269. The README provides detailed usage examples and technical documentation but does not include an exploit PoC or analysis of the vulnerability itself.

Classification
Writeup 90%
Attack Type
Other
Complexity
Moderate
Reliability
Theoretical
Target: cron-utils (version 9.0.1)
No auth needed
Prerequisites: None specified
devstral-2 · analyzed Mar 14, 2026 Full analysis →
nomisec WRITEUP
by andikahilmy · poc
https://github.com/andikahilmy/CVE-2021-41269-cron-utils-vulnerable

This repository contains a vulnerable version of the cron-utils library (CVE-2021-41269) with detailed documentation and usage examples. It does not include exploit code but provides technical context for the vulnerability.

Classification
Writeup 90%
Attack Type
Other
Complexity
Moderate
Reliability
Theoretical
Target: cron-utils (version 9.0.1 and earlier)
No auth needed
Prerequisites: Access to a system using the vulnerable cron-utils library
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec WRITEUP
by shoucheng3 · poc
https://github.com/shoucheng3/jmrozanec__cron-utils_CVE-2021-41269_9-1-5

This repository contains documentation and examples for the cron-utils library, including usage examples and feature descriptions. It does not contain exploit code or a proof-of-concept for CVE-2021-41269.

Classification
Writeup 90%
Attack Type
Other
Complexity
Trivial
Reliability
Theoretical
Target: cron-utils library
No auth needed
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Scores

CVSS v3 10.0
EPSS 0.0188
EPSS Percentile 83.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Details

CWE
CWE-94
Status published
Products (2)
com.cronutils/cron-utils 0 - 9.1.6Maven
cron-utils_project/cron-utils < 9.1.6
Published Nov 15, 2021
Tracked Since Feb 18, 2026