CVE-2021-44521— Remote code execution for scripted UDFs
Quick assessment
Affected
Apache Software Foundation Apache Cassandra
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.
Apache Cassandra是美国阿帕奇（Apache）基金会的一个分布式Nosql数据库。Cassandra是一个混合型的非关系的数据库，类似于Google的BigTable。其主要功能比Dynamo （分布式的Key-Value存储系统）更丰富，但支持度却不如文档存储MongoDB（介于关系数据库和非关系数据库之间的开源产品，是非关系数据库当中功能最丰富，最像关系数据库的。 Apache Cassandra 存在代码注入漏洞，该漏洞源于在特定配置下攻击者有可能在主机上执行任意代码。攻击者需要有足够
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing Application
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2021-44521
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Remote code execution for scripted UDFs
Source: CVE Program / CVE List V5
Vulnerability Description
When running Apache Cassandra with the following configuration: enable_user_defined_functions: true enable_scripted_user_defined_functions: true enable_user_defined_functions_threads: false it is possible for an attacker to execute arbitrary code on the host. The attacker would need to have enough permissions to create user defined functions in the cluster to be able to exploit this. Note that this configuration is documented as unsafe, and will continue to be considered unsafe after this CVE.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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
Apache Cassandra 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Cassandra是美国阿帕奇（Apache）基金会的一个分布式Nosql数据库。Cassandra是一个混合型的非关系的数据库，类似于Google的BigTable。其主要功能比Dynamo （分布式的Key-Value存储系统）更丰富，但支持度却不如文档存储MongoDB（介于关系数据库和非关系数据库之间的开源产品，是非关系数据库当中功能最丰富，最像关系数据库的。 Apache Cassandra 存在代码注入漏洞，该漏洞源于在特定配置下攻击者有可能在主机上执行任意代码。攻击者需要有足够
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)
Shenlong Deep Dive — AI Deep Analysis
10-question deep dive: root cause, exploitation, mitigation, urgency. Read summary free, full version requires login.
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Apache Software Foundation | Apache Cassandra | 3.0.0 ~ unspecified | - |
|
II. Public POCs for CVE-2021-44521
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | Automated PoC of CVE-2021-44521 | https://github.com/WoodenKlaas/CVE-2021-44521 | POC Details |
| 2 | full PoC of CVE-2021-44521 | https://github.com/Yeyvo/poc-CVE-2021-44521 | POC Details |
| 3 | When running Apache Cassandra with the following configuration: enable_user_defined_functions: true enable_scripted_user_defined_functions: true enable_user_defined_functions_threads: false it is possible for an attacker to execute arbitrary code on the host. The attacker would need to have enough permissions to create user defined functions in the cluster to be able to exploit this. Note that this configuration is documented as unsafe, and will continue to be considered unsafe after this CVE. | https://github.com/projectdiscovery/nuclei-templates/blob/main/network/cves/2021/CVE-2021-44521.yaml | POC Details |
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2021-44521
请登录查看更多情报信息。
Vendor Advisories for CVE-2021-44521 (1)
-
https://security.netapp.com/advisory/ntap-20220225-0001/ x_refsource_CONFIRM
Mailing List Discussions for CVE-2021-44521 (2)
-
https://lists.apache.org/thread/y4nb9s4co34j8hdfmrshyl09lokm7356 x_refsource_MISC
-
Security Blog Posts for CVE-2021-44521 (1)
Same Patch Batch · Apache Software Foundation · 2022-02-11 · 3 CVEs total
| CVE-2022-24289 | Deserialization of untrusted data in the Hessian Component of Apache Cayenne 4.1 with olde | |
| CVE-2022-24112 | apisix/batch-requests plugin allows overwriting the X-REAL-IP header |
IV. Related Vulnerabilities
Same product: Apache Cassandra
-
CVE-2026-32588
Apache Cassandra: Authenticated DoS via ALTER ROLE Password -
CVE-2026-27315
Apache Cassandra: cqlsh history sensitive information leak -
CVE-2026-27314
Apache Cassandra: Privilege escalation via ADD IDENTITY auth -
CVE-2025-26467
Apache Cassandra: User with MODIFY permission on ALL KEYSPAC -
CVE-2024-27137
Apache Cassandra: unrestricted deserialization of JMX authen
Same vendor: Apache Software Foundation
-
CVE-2026-102795
Apache Traffic Server: SNI to Host header matching policy is -
CVE-2026-59265
Apache OpenOffice, Apache OpenOffice: Opening a malicious do -
CVE-2026-66054
Apache Thrift: C++ THeaderTransport does not enforce configu -
CVE-2026-61374
Apache Thrift: Java TSaslTransport post-auth data-frame miss -
CVE-2026-63772
Apache Thrift: Unauthenticated single-packet crash of Go Thr
Same weakness: CWE-94
-
CVE-2026-92084
Beaver Builder Page Builder <= 2.11.0.5 - Unauthenticated Ar -
CVE-2026-100157
WP Ultimate Review <= 2.4.3 - Unauthenticated Arbitrary Shor -
CVE-2026-103519
WP Ultimate Review <= 2.4.3 - Authenticated (Subscriber+) Ar -
CVE-2026-100152
All in One SEO <= 5.0.2 - Unauthenticated Arbitrary Shortcod -
CVE-2026-92536
Paid Membership Plugin, Ecommerce, User Registration Form, L
V. Comments for CVE-2021-44521
No comments yet