What is CVE-2021-38384?

CVE-2021-38384 is a critical-severity vulnerability in Serverless Offline Project, classified under Improper Handling of Exceptional Conditions. CVSS score: 9.8/10. Published 2021-08-10.

How severe is CVE-2021-38384?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Serverless Offline Project

CVE-2021-38384

Serverless Offline 8.0.0 returns a 403 HTTP status code for a route that has a trailing / character, which might cause a developer to implement incorrect access control, because the actual behavior within the Amazon AWS environment is a 200 HTTP status code (i.e., possibly greater than expected permissions).

Published 2021-08-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.015 (72.6th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 72.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Serverless Offline Project — versions 8.0.0

Weakness classification (CWE)

CWE-755 — Improper Handling of Exceptional Conditions

References

github.com/dherault/serverless-offline/issues/1259 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-38384?: CVE-2021-38384 is a critical-severity vulnerability in Serverless Offline Project, classified under Improper Handling of Exceptional Conditions. CVSS score: 9.8/10. Published 2021-08-10.
How severe is CVE-2021-38384?: Critical severity. CVSS v3 base score is 9.8 out of 10.