CVE-2021-29442Known exploitationPublic exploitNetwork attack vector

Database disclosure via unsecured Derby query endpoint

Published Apr 27, 2021 · Updated Aug 3, 2024

Missing authentication in Alibaba Group Nacos before 1.4.1 allows remote attackers to read embedded Derby data through the /derby endpoint. ConfigOpsController passes the sql parameter to JdbcTemplate.queryForList after checking only that it starts with select, while the route lacks @Secured. The route is exploitable without credentials only when embedded Derby storage is active; external-database deployments are not affected by this endpoint.

CVSS severity7.5
High
EPSS probability66.63%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Missing authentication in Alibaba Group Nacos before 1.4.1 allows remote attackers to read embedded Derby data through the /derby endpoint. ConfigOpsController passes the sql parameter to JdbcTemplate.queryForList after checking only that it starts with select, while the route lacks @Secured. The route is exploitable without credentials only when embedded Derby storage is active; external-database deployments are not affected by this endpoint.

The record

CVE
CVE-2021-29442
Published
Apr 27, 2021
Updated
Aug 3, 2024
Vendor
Alibaba Group
Product
Nacos
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Alibaba Group · Nacosversion=< 1.4.1

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo