`CVE-2021-29442` Nacos

Affected software	Nacos
Severity	8.6 High CVSS 3.1 3 scores
Fixed in	`1.4.1`
Weakness	Missing authentication (CWE-306)
Published	27 Apr 2021
Updated	17 Jun 2026

Description

Nacos is a platform designed for dynamic service discovery and configuration and service management. In Nacos before version 1.4.1, the ConfigOpsController lets the user perform management operations like querying the database or even wiping it out. While the /data/remove endpoint is properly protected with the @Secured annotation, the /derby endpoint is not protected and can be openly accessed by unauthenticated users. These endpoints are only valid when using embedded storage (derby DB) so this issue should not affect those installations using external storage (e.g. mysql)

CWE-290

Exploitation status

Exploited

Real-world exploitation reported by VulnCheck KEV. CISA has not confirmed it.

CISA KEV not listed
VulnCheck KEV listed Exploitation reported in the wild. 2 citations · honeypot sightings · 2 exploits · earliest 2023-11-19.
CISA Vulnrichment no assessment published
Indexed PoC 3 indexed Published artifacts you can open, in GitHub PoC, Nuclei; first seen 2024-07-31.
EPSS 64% chance in 30 days A model's forecast, not a report of exploitation. Higher than 99% of all scored CVEs.

VulnCheck KEV

Exploitation evidence from VulnCheck Known Exploited Vulnerabilities (VulnCheck KEV), used under VulnCheck's community terms. View CVE-2021-29442 in VulnCheck (free account).

Evidence	Source	Detail	Date
Honeypot sighting	Shadowserver honeypots	Exploitation attempts seen on 446 days	2023-11-19 to 2026-11-12
Honeypot sighting	VulnCheck canaries	Exploitation attempts seen on 24 days	2025-10-17 to 2026-11-07
Reported exploitation	blog.talosintelligence.com	/uat-10147-chinese-speaking-adversary-integrates-agentic-ai-into-post-compromise-operations	2026-08-20
Reported exploitation	recordedfuture.com	/blog/august-2026-cve-landscape	2026-09-08
Exploit reference	VulnCheck XDB fcdd46d9ff5b	Exploit type: initial-access	2024-11-26
Exploit reference	VulnCheck XDB 33071aac3301	Exploit type: remote-with-credentials	2026-02-23

Evidence

Source

Detail

Date

Honeypot sighting

Shadowserver honeypots

Exploitation attempts seen on 446 days

2023-11-19 to 2026-11-12

Honeypot sighting

VulnCheck canaries

Exploitation attempts seen on 24 days

2025-10-17 to 2026-11-07

Reported exploitation

blog.talosintelligence.com

/uat-10147-chinese-speaking-adversary-integrates-agentic-ai-into-post-compromise-operations

2026-08-20

Reported exploitation

recordedfuture.com

/blog/august-2026-cve-landscape

2026-09-08

Exploit reference

VulnCheck XDB fcdd46d9ff5b

Exploit type: initial-access

2024-11-26

Exploit reference

VulnCheck XDB 33071aac3301

Exploit type: remote-with-credentials

2026-02-23

2 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

Index	Artifact	Stars	First seen
GitHub PoC	QVD-2024-26473 && CVE-2021-29442	3	2024-07-31
GitHub PoC	Nacos Derby命令执行漏洞利用脚本		2024-11-25
Nuclei	Nacos <1.4.1 - Authentication Bypass

Index

Artifact

Stars

First seen

GitHub PoC

QVD-2024-26473 && CVE-2021-29442

2024-07-31

GitHub PoC

Nacos Derby命令执行漏洞利用脚本

2024-11-25

Nuclei

Nacos <1.4.1 - Authentication Bypass

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

Protection none
Action not pursued none
Review automated Upstream data
Record active

Decided by	An OSV.dev record of this CVE affecting a package published to Maven Central. When every such package is one business applications do not use (Minecraft mods and launchers, Fastjson) and no tracked product is named by CPE, it settles the CVE as Outside Waratek scope instead
Finding	Every Maven package this CVE affects (com.alibaba.nacos:nacos-common) is on the excluded_maven_packages list in known-products.yaml, so it is not reviewed.

Decided by

An OSV.dev record of this CVE affecting a package published to Maven Central. When every such package is one business applications do not use (Minecraft mods and launchers, Fastjson) and no tracked product is named by CPE, it settles the CVE as Outside Waratek scope instead

Finding

Every Maven package this CVE affects (com.alibaba.nacos:nacos-common) is on the excluded_maven_packages list in known-products.yaml, so it is not reviewed.

CVSS

8.6 HIGH v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N 3 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

Version Score Band Vector Assigner Type

CVSS 3.1 8.6 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N security-advisories@github.com Secondary published

CVSS 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N NVD Primary

CVSS 2.0 5.0 none AV:N/AC:L/Au:N/C:P/I:N/A:N NVD Primary

Version	Score	Band	Vector	Assigner	Type
CVSS 3.1	8.6	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N`	security-advisories@github.com	Secondary	published
CVSS 3.1	7.5	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`	NVD	Primary
CVSS 2.0	5.0	none	`AV:N/AC:L/Au:N/C:P/I:N/A:N`	NVD	Primary

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev

Package Introduced Fixed Last affected

com.alibaba.nacos:nacos-common 0 1.4.1 unbounded

Package	Introduced	Fixed	Last affected
`com.alibaba.nacos:nacos-common`	0	`1.4.1`	unbounded

Products and versions

2 products, 2 version entries

Source	Vendor	Product	Scheme	Affected versions
nvd	alibaba	nacos	generic	＜ 1.4.1
osv	com.alibaba.nacos	nacos-common	generic	＜ 1.4.1

Source

Vendor

Product

Scheme

Affected versions

nvd

alibaba

nacos

generic

＜ 1.4.1

osv

com.alibaba.nacos

nacos-common

generic

＜ 1.4.1

References

URL	Tags
https://github.com/alibaba/nacos/issues/4701	WEB
https://github.com/alibaba/nacos/pull/4703	WEB
https://github.com/advisories/GHSA-36hp-jr8h-556f	ADVISORY
https://github.com/alibaba/nacos/issues/4463	WEB
https://github.com/alibaba/nacos/pull/4517	WEB

URL

Timeline

Published	2021-04-27	By the CVE Program.
VulnCheck KEV: earliest evidence	2023-11-19	Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.
NVD record modified	2026-06-17	NVD's own last-modified date for this record.
VulnCheck KEV: latest evidence	2026-11-12	Date of the newest report, exploit reference or honeypot sighting in VulnCheck KEV's record.

Published

2021-04-27

By the CVE Program.

VulnCheck KEV: earliest evidence

2023-11-19

Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.

NVD record modified

2026-06-17

NVD's own last-modified date for this record.

VulnCheck KEV: latest evidence

2026-11-12

Date of the newest report, exploit reference or honeypot sighting in VulnCheck KEV's record.

How VRT decided (9 of 24 rules ran)

9 of 24 rules ran. The rest didn't run because an earlier rule had already settled the CVE.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? the first rule that matches decides

1 rejected no match CVE Program withdrawal of this identifier

scope: Is it a vulnerability Waratek protects? the first rule that matches decides

2 armr-patch-file no match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file no match An ARMR security-rule template on disk for this CVE

4 manual-classification no match A researcher's recorded decision for this specific CVE

5 manual classification no match Manual classification of this CVE in the legacy dataset

6 non-java-upstream no match A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component no match The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the JInitiator browser plug-in, the native WebLogic proxy plug-in, or a native part of Oracle Application Server or Collaboration Suite (HTTP Server, Web Cache, Internet Directory, mail and calendar servers). Oracle gives these no CPE of their own and names them only in the description.

8 java-client-side no match Oracle's own risk-matrix note saying the CVE is reached only through untrusted code in the Java sandbox (applets, Web Start) or only through a client installation of Java, so a server running its own trusted code is not exposed

9 osv-maven decided it matched Outside Waratek scope Maven packages excluded by policy: com.alibaba.nacos:nacos-common

10 cna-maven-package not reached An affected Maven artifact named by the CNA itself

11 known-cpe-product not reached An NVD CPE naming a product ARMR tracks

12 cna-cpe-product not reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

13 oracle-advisory-family not reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

14 cna-named-product not reached A tracked product named in words by the CVE's own CNA, on a record with no CPE yet. Apache and Eclipse publish these on advisory day, before NVD adds CPE data.

15 non-deployable-product not reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

16 unmatched-product not reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? every rule runs

17 patch-hint not reached A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

18 open-source-maven not reached The affected package being open source on Maven, so the fix can be read

19 poc-derivable not reached An indexed exploit clearing the evidence bar to reverse-engineer, where there is no source to read

20 no-exploit not reached Nothing to build a rule from yet: no published exploit, no CISA record of exploitation and no source-level change to read

21 secure-rule-match not reached A vulnerability class already blocked by an ARMR security rule

22 exploited-no-fix-or-poc not reached Somebody exploiting this CVE (a CISA or VulnCheck KEV listing, or a CISA verdict of active exploitation), with no fix, source code or PoC to build a rule from

23 below-action-threshold not reached Medium or Low severity, no CISA or VulnCheck KEV listing, no PoC clearing the evidence bar, no CISA verdict, no Oracle advisory

24 no-exploit-published not reached Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all

Products the scope rules checked

The products this CVE's record names, and whether VRT tracks each one. The scope rules decided on these.

Vendor Product Tracked CPE Source

alibaba nacos not tracked cpe:2.3:a:alibaba:nacos:*:*:*:*:*:*:*:*

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