CVE-2021-38621

Name: CVE-2021-38621
Creator: NVD / NIST
Published: 2021-08-13T15:15:07.16+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 0.99%

Last modified Jun 17, 2026

CVE-2021-38621 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. The remove API in v1/controller/cloudStorage/alibabaCloud/remove/index.ts in netless Agora Flat Server before 2021-07-30 mishandles file ownership.. EPSS estimates a 0.99% chance of exploitation in the next 30 days.

Description

The remove API in v1/controller/cloudStorage/alibabaCloud/remove/index.ts in netless Agora Flat Server before 2021-07-30 mishandles file ownership.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

0.99%

57.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Netless	Flat Server	< 2021-07-30

References

https://github.com/netless-io/flat-server/commit/425aa970f6366874c61aa1466527fced5501e476Patch, Third Party Advisory
https://github.com/netless-io/flat-server/commit/425aa970f6366874c61aa1466527fced5501e476Patch, Third Party Advisory

Timeline

Published: Aug 13, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-38621?

The remove API in v1/controller/cloudStorage/alibabaCloud/remove/index.ts in netless Agora Flat Server before 2021-07-30 mishandles file ownership.

How severe is CVE-2021-38621?

CVE-2021-38621 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.99% probability of exploitation in the next 30 days.

How do I fix CVE-2021-38621?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-38621?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST