How severe is CVE-2021-23388?

CVE-2021-23388 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2021-23388 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23388?

CVE-2021-23388 affects Forms Project Forms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23388?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-23388 published?

CVE-2021-23388 was published on 2021-06-01 and last updated on 2026-06-17.

CVE-2021-23388

CVE-2021-23388 is a medium-severity vulnerability in Forms Project Forms with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Forms Project Forms
Published: 2021-06-01
Last modified: 2026-06-17

Description

The package forms before 1.2.1, from 1.3.0 and before 1.3.2 are vulnerable to Regular Expression Denial of Service (ReDoS) via email validation.

Frequently asked questions

What is CVE-2021-23388?: The package forms before 1.2.1, from 1.3.0 and before 1.3.2 are vulnerable to Regular Expression Denial of Service (ReDoS) via email validation.
How severe is CVE-2021-23388?: CVE-2021-23388 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2021-23388 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23388?: CVE-2021-23388 affects Forms Project Forms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23388?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-23388 published?: CVE-2021-23388 was published on 2021-06-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:forms_project:forms:*:*:*:*:*:node.js:*:*

More vulnerabilities in Forms Project Forms

CVE-2017-16015 — Medium (CVSS 6.1): Forms is a library for easily creating HTML forms. Versions before 1.3.0 did not have proper html escaping. This means…

All CVEs affecting Forms Project Forms →