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CVE-2021-23388

19
FAUCET Score

CVE-2021-23388 describes a Regular Expression Denial of Service (ReDoS) vulnerability affecting versions of the 'forms' package before 1.2.1 and between 1.3.0 and 1.3.2, specifically impacting email validation. This medium-severity vulnerability (CVSS 5.3) can be exploited remotely with low attack complexity, potentially leading to a denial of service. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.2.1CPE matchmatch criteria
cpe:2.3:a:forms_project:forms:*:*:*:*:*:node.js:*:*
>= 1.3.0, < 1.3.2CPE matchmatch criteria
cpe:2.3:a:forms_project:forms:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.65%
Probability of exploitation in next 30 days
EPSS Percentile
74.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0165 is in the 59th percentile among its peer group of 23,705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: formsFixed in: 1.3.2

Vendor Advisories (1)

npmGHSA-c56f-grv3-gpfrmedium

Regular expression denial of service in forms

Jun 7, 2021

References

github.com / caolan/forms/pull/214
Third Party Advisory
github.com / caolan/forms/pull/214/commits/d4bd5b5febfe49c1f585f162e04ec810f8dc47a0
PatchThird Party Advisory
snyk.io / vuln/SNYK-JS-FORMS-1296389
PatchThird Party Advisory