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Vulnerability record · CVE-2021-43116 · published 5 July 2022

CVE-2021-43116: Alibaba nacos improper authentication vulnerability

Alibaba · Nacos

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.

8.8 CVSS 3.1 High EPSS 7.5% · top 5.7% CWE-287 · Improper authentication
8.8CVSS 3.1 base score, v2 6.5
7.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 4 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/171638/Nacos-2.0.3-Access-Control.html
https://github.com/alibaba/nacos/issues/7127 ExploitIssue TrackingThird Party Advisory
https://github.com/alibaba/nacos/issues/7182 ExploitIssue TrackingThird Party Advisory
http://packetstormsecurity.com/files/171638/Nacos-2.0.3-Access-Control.html
https://github.com/alibaba/nacos/issues/7127 ExploitIssue TrackingThird Party Advisory
https://github.com/alibaba/nacos/issues/7182 ExploitIssue TrackingThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-43116), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.