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CVE-2021-41269— Unauthenticated remote code injection in cron-utils

Quick assessment

Affected
jmrozanec cron-utils
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cron Utils是Jmrozanec个人开发者的一个用于验证、解析、迁移 Cron 表达式的Java代码库。 Cron Utils 存在代码注入漏洞，攻击者能够注入任意Java EL表达式来执行远程代码。

CVSS 10.0 · Critical EPSS 4.35% · P91

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-41269

Vulnerability Information
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Vulnerability Title
Unauthenticated remote code injection in cron-utils
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Cron Utils 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cron Utils是Jmrozanec个人开发者的一个用于验证、解析、迁移 Cron 表达式的Java代码库。 Cron Utils 存在代码注入漏洞，攻击者能够注入任意Java EL表达式来执行远程代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jmrozanec cron-utils < 9.1.6 -

II. Public POCs for CVE-2021-41269

# POC Description Source Link Shenlong Link
1 None https://github.com/shoucheng3/jmrozanec__cron-utils_CVE-2021-41269_9-1-5 POC Details
2 None https://github.com/andikahilmy/CVE-2021-41269-cron-utils-vulnerable POC Details
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III. Intelligence Information for CVE-2021-41269

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Patches & Fixes for CVE-2021-41269 (2)

Vendor Advisories for CVE-2021-41269 (1)

Other References for CVE-2021-41269 (1)

IV. Related Vulnerabilities

Same product: cron-utils
Same vendor: jmrozanec
Same weakness: CWE-94

V. Comments for CVE-2021-41269

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