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CVE-2020-19676

CVE-2020-19676: Incorrect Access Control in Nacos

5.3

CVSS Score
3.1

Basic Information

CVE ID
CVE-2020-19676
GHSA ID
GHSA-qf76-pr7x-h7r4
EPSS Score
0.58667%
CWE
CWE-200
Published
8/2/2021
Updated
2/1/2023
KEV Status
No
Technology
TechnologyJava

Technical Details

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Package NameEcosystemVulnerable VersionsFirst Patched Version
com.alibaba.nacos:nacos-commonmaven< 1.2.01.2.0

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The vulnerability centers on missing authentication checks in service metadata endpoints. While explicit patch diffs aren't available, the 1.2.0 release notes explicitly reference fixing access control (Issue #1105) and the CVE describes unauthorized access to service list/detail endpoints. In Spring-based architectures like Nacos, these would map to controller methods handling /v1/ns/service/list and /v1/ns/service/detail endpoints. The confidence is medium because we're inferring based on architectural patterns and issue descriptions rather than direct patch analysis.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

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Reasoning

T** vuln*r**ility **nt*rs on missin* *ut**nti**tion ****ks in s*rvi** m*t***t* *n*points. W*il* *xpli*it p*t** *i**s *r*n't *v*il**l*, t** *.*.* r*l**s* not*s *xpli*itly r***r*n** *ixin* ****ss *ontrol (Issu* #****) *n* t** *V* **s*ri**s un*ut*oriz**