CVE-2021-43116

HIGHNVD 8.88.8—

8.8

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 v3: 8.8
EG Score: 8.8(medium)
EPSS: 90.6%
KEV: Not listed

Published

July 5, 2022

Last Modified

November 21, 2024

References (6)

cve@mitrehttp://packetstormsecurity.com/files/171638/Nacos-2.0.3-Access-Control.html
cve@mitrehttps://github.com/alibaba/nacos/issues/7127
cve@mitrehttps://github.com/alibaba/nacos/issues/7182
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/171638/Nacos-2.0.3-Access-Control.html
af854a3a-2127-422b-91ae-364da2661108https://github.com/alibaba/nacos/issues/7127
af854a3a-2127-422b-91ae-364da2661108https://github.com/alibaba/nacos/issues/7182

Patch Availability(1)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
maven	com.alibaba.nacos:nacos-client	—	ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)

Maven(1)

Package	Vulnerable range	Fixed in	Dependents
com.alibaba.nacos:nacos-client	0.1.0 ... 2.0.3 (51 versions)	—	—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 9× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-25 19:27 UTCEG score recompute
2026-05-25 19:27 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-43116?

CVE-2021-43116 is a high vulnerability published on July 5, 2022. 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.

When was CVE-2021-43116 disclosed?

CVE-2021-43116 was first published in the National Vulnerability Database on July 5, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-43116 actively exploited?

CVE-2021-43116 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 90.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-43116?

CVE-2021-43116 has a CVSS v3 base score of 8.8 (NVD).

How do I remediate CVE-2021-43116?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-43116, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-43116

Explore →

Is Your Infrastructure Affected by CVE-2021-43116?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs