How severe is CVE-2020-36941?

CVE-2020-36941 has a CVSS 3.x base score of 9.8, 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 high.

Is CVE-2020-36941 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-36941?

CVE-2020-36941 affects Guelfoweb Knockpy. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-36941?

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.

Does CVE-2020-36941 have an EU (EUVD) identifier?

Yes. CVE-2020-36941 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2020-30859.

When was CVE-2020-36941 published?

CVE-2020-36941 was published on 2026-01-27 and last updated on 2026-06-17.

CVE-2020-36941

CVE-2020-36941 is a critical-severity vulnerability in Guelfoweb Knockpy with a CVSS 3.x base score of 9.8. 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-1236.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 5.3
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2020-30859
Weakness: CWE-1236
Affected product: Guelfoweb Knockpy
Published: 2026-01-27
Last modified: 2026-06-17

Description

Knockpy 4.1.1 contains a CSV injection vulnerability that allows attackers to inject malicious formulas into CSV reports through unfiltered server headers. Attackers can manipulate server response headers to include spreadsheet formulas that will execute when the CSV is opened in spreadsheet applications.

Frequently asked questions

What is CVE-2020-36941?: Knockpy 4.1.1 contains a CSV injection vulnerability that allows attackers to inject malicious formulas into CSV reports through unfiltered server headers. Attackers can manipulate server response headers to include spreadsheet formulas that will execute when the CSV is opened in spreadsheet applications.
How severe is CVE-2020-36941?: CVE-2020-36941 has a CVSS 3.x base score of 9.8, 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 high.
Is CVE-2020-36941 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-36941?: CVE-2020-36941 affects Guelfoweb Knockpy. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-36941?: 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.
Does CVE-2020-36941 have an EU (EUVD) identifier?: Yes. CVE-2020-36941 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2020-30859.
When was CVE-2020-36941 published?: CVE-2020-36941 was published on 2026-01-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:guelfoweb:knockpy:4.1.1:*:*:*:*:*:*:*

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