PatchTheCVECVE-2021-38621: The remove API in v1/controller/cloudStorage/alibabaCloud/remove/index.ts in netless Agora Flat Server before
CVE-2021-38621 is a critical-severity flaw (CVSS 9.1) affecting flat server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The remove API in v1/controller/cloudStorage/alibabaCloud/remove/index.ts in netless Agora Flat Server before 2021-07-30 mishandles file ownership.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.1 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.0% (top 38%) |
| CISA exploited list | No |
| Published | 2021-08-13 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-38621?
flat server: upgrade to 2021-07-30. Exact commands for each OS are on this page.
Is CVE-2021-38621 being exploited?
CVE-2021-38621 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-38621 affect?
CVE-2021-38621 affects flat server. Severity is critical (CVSS 9.1). The remove API in v1/controller/cloudStorage/alibabaCloud/remove/index.ts in netless Agora Flat Server before 2021-07-30 mishandles file ownership.
How urgent is CVE-2021-38621?
Priority 52/100. Critical severity; Remotely exploitable, no login, no user action