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CVE-2021-23384

18
FAUCET Score

CVE-2021-23384 is an Open Redirect vulnerability affecting versions of the koa-remove-trailing-slashes package prior to 2.0.2. This flaw allows an attacker to redirect users to arbitrary malicious sites by exploiting the use of trailing double slashes in URLs, due to the web server's reliance on relative URLs. With a CVSS score of 5.4 (Medium), it requires user interaction and can lead to low impact on confidentiality and integrity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.0.2CPE matchmatch criteria
cpe:2.3:a:koa-remove-trailing-slashes_project:koa-remove-trailing-slashes:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

5.4MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.83%
Probability of exploitation in next 30 days
EPSS Percentile
53.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0083 is in the 63rd percentile among its peer group of 26,221 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

npmpatch availablevia ghsa
Product: koa-remove-trailing-slashesFixed in: 2.0.2

Vendor Advisories (1)

npmGHSA-r773-pmw3-f4mrmedium

Open Redirect in koa-remove-trailing-slashes

Feb 10, 2022

References

github.com / vgno/koa-remove-trailing-slashes/blame/6a01ba8fd019bd3ece44879c553037ad96ba7d47/index.js%23L31
Broken Link
snyk.io / vuln/SNYK-JS-KOAREMOVETRAILINGSLASHES-1085708
ExploitThird Party Advisory