How severe is CVE-2020-28437?

CVE-2020-28437 has a CVSS 3.x base score of 9.4, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability low.

Is CVE-2020-28437 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-28437?

CVE-2020-28437 affects Heroku-env Project Heroku-env. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-28437?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-28437 published?

CVE-2020-28437 was published on 2022-08-02 and last updated on 2026-06-17.

CVE-2020-28437

CVE-2020-28437 is a critical-severity vulnerability in Heroku-env Project Heroku-env with a CVSS 3.x base score of 9.4. 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-77.

Key facts

Severity: Critical (CVSS 3.x base score 9.4)
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-77
Affected product: Heroku-env Project Heroku-env
Published: 2022-08-02
Last modified: 2026-06-17

Description

This affects all versions of package heroku-env. The injection point is located in lib/get.js which is required by index.js.

Frequently asked questions

What is CVE-2020-28437?: This affects all versions of package heroku-env. The injection point is located in lib/get.js which is required by index.js.
How severe is CVE-2020-28437?: CVE-2020-28437 has a CVSS 3.x base score of 9.4, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability low.
Is CVE-2020-28437 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-28437?: CVE-2020-28437 affects Heroku-env Project Heroku-env. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-28437?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-28437 published?: CVE-2020-28437 was published on 2022-08-02 and last updated on 2026-06-17.

References

https://security.snyk.io/vuln/SNYK-JS-HEROKUENV-1050432

Affected products (1)

cpe:2.3:a:heroku-env_project:heroku-env:*:*:*:*:*:node.js:*:*

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