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Fencer Vulns
high 8.6

CVE-2021-29442 in the critical feed json

Authentication bypass

published 2021-04-27 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-0888

cvss
8.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
64.2%
EPSS 64.2% chance of exploitation in 30 days, percentile 99.2%
public exploits
0
none known, plus a Nuclei check

Summary

Nacos is a platform designed for dynamic service discovery and configuration and service management. In Nacos before version 1.4.1, the ConfigOpsController lets the user perform management operations like querying the database or even wiping it out. While the /data/remove endpoint is properly protected with the @Secured annotation, the /derby endpoint is not protected and can be openly accessed by unauthenticated users. These endpoints are only valid when using embedded storage (derby DB) so this issue should not affect those installations using external storage (e.g. mysql)

Patch / fix

  • alibaba nacos 1.4.1

Exploit prediction

64.20% chance of exploitation in the next 30 days, higher than 99.2% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template Nacos <1.4.1 - Authentication Bypass nuclei detection template
  • github.com https://github.com/alibaba/nacos/issues/4463 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/advisories/GHSA-36hp-jr8h-556f referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • alibaba nacos

Classification

Weakness
  • CWE-306 Missing Authentication for Critical Functionality

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.