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CVE-2021-43116

42
FAUCET Score

CVE-2021-43116 is an access control vulnerability in Alibaba Nacos version 2.0.3, allowing an authenticated attacker to bypass login by manipulating network traffic during the authentication process. With a CVSS score of 8.8 (High), this flaw presents a significant risk due to its low attack complexity and high impact on confidentiality, integrity, and availability. While not listed on the KEV catalog, public exploit code is available via ExploitDB (EDB-51205), indicating a clear path for exploitation, though there is minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.0.3CPE matchmatch criteria
cpe:2.3:a:alibaba:nacos:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
7.40%
Probability of exploitation in next 30 days
EPSS Percentile
93.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
ExploitDB: EDB-51205 · Apr 3, 2023
This CVE's current EPSS score of 0.0740 is in the 93rd percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

mavenGHSA-2g86-r6w2-wqqrhigh

Use of Hard-coded Credentials in Nacos

Jul 6, 2022

References

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