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CVE-2021-38384

28
FAUCET Score

CVE-2021-38384 describes a critical vulnerability in Serverless Offline 8.0.0 where it incorrectly returns a 403 HTTP status code for routes with trailing slashes, while the actual AWS environment returns a 200. This discrepancy could lead developers to implement flawed access control, potentially granting unintended permissions. With a CVSS score of 9.8 (CRITICAL), this vulnerability is easily exploitable over the network with no authentication required, allowing for high impact to confidentiality, integrity, and availability. There is currently no known active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
8.0.0CPE matchmatch criteria
cpe:2.3:a:serverless_offline_project:serverless_offline:8.0.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.46%
Probability of exploitation in next 30 days
EPSS Percentile
70.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0146 is in the 58th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

npmGHSA-h97f-5258-5593critical

Incorrect Authorization in serverless-offline

Sep 1, 2021

References

github.com / dherault/serverless-offline/issues/1259
ExploitThird Party Advisory