How severe is CVE-2021-23382?

CVE-2021-23382 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-2021-23382 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23382?

CVE-2021-23382 affects Postcss. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23382?

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

When was CVE-2021-23382 published?

CVE-2021-23382 was published on 2021-04-26 and last updated on 2026-06-17.

CVE-2021-23382

CVE-2021-23382 is a medium-severity vulnerability in Postcss 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. The underlying weakness is classified as CWE-1333.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1333
Affected product: Postcss
Published: 2021-04-26
Last modified: 2026-06-17

Description

The package postcss before 8.2.13 are vulnerable to Regular Expression Denial of Service (ReDoS) via getAnnotationURL() and loadAnnotation() in lib/previous-map.js. The vulnerable regexes are caused mainly by the sub-pattern \/\*\s* sourceMappingURL=(.*).

Frequently asked questions

What is CVE-2021-23382?: The package postcss before 8.2.13 are vulnerable to Regular Expression Denial of Service (ReDoS) via getAnnotationURL() and loadAnnotation() in lib/previous-map.js. The vulnerable regexes are caused mainly by the sub-pattern \/\*\s* sourceMappingURL=(.*).
How severe is CVE-2021-23382?: CVE-2021-23382 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-2021-23382 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23382?: CVE-2021-23382 affects Postcss. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23382?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-23382 published?: CVE-2021-23382 was published on 2021-04-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:postcss:postcss:*:*:*:*:*:node.js:*:*

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