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CVE-2021-43116 Nacos

Affected softwareNacos
Severity8.8 High CVSS 3.1 2 scores
WeaknessImproper authentication (CWE-287)
Published5 Jul 2022
Updated17 Jun 2026

Description

An Access Control vulnerability exists in Nacos 2.0.3 in the access prompt page; enter username and password, click on login to capture packets and then change the returned package, which lets a malicious user login.

CWE-798 · Hard-coded credentials

Exploitation status

Working exploit published

A reviewed exploit catalogue lists ready-to-run exploit code for this CVE.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC 1 indexed Published artifacts you can open, in Exploit-DB; first seen 2023-04-03.
  • EPSS 7.5% chance in 30 days
IndexArtifactStarsFirst seen
Exploit-DB Nacos 2.0.3 - Access Control vulnerability 2023-04-03

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-client) is on the excluded_maven_packages list in known-products.yaml, so it is not reviewed.

CVSS

8.8 HIGH v3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 2 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.

VersionScoreBandVectorAssignerType
CVSS 3.1 8.8 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H NVD Primary published
CVSS 2.0 6.5 none AV:N/AC:L/Au:S/C:P/I:P/A:P NVD Primary

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
com.alibaba.nacos:nacos-client 0 none 2.0.3

Products and versions

2 products, 2 version entries
SourceVendorProductSchemeAffected versions
nvd alibaba nacos generic ≤ 2.0.3
osv com.alibaba.nacos nacos-client generic ≤ 2.0.3

References

URLTags
https://github.com/alibaba/nacos/issues/7127 WEB
https://github.com/alibaba/nacos/issues/7182 WEB
https://github.com/alibaba/nacos PACKAGE
http://packetstormsecurity.com/files/171638/Nacos-2.0.3-Access-Control.html WEB

Timeline

Published2022-07-05By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.