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Vulnerabilities

Vulnerability · 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.

Published Jan 27, 2026 · catalog updated Mar 5, 2026 · Knockpy 4.1.1 contains a

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2020-36941. EPSS is 0.59%. Act only if a listed version of Knockpy 4.1.1 contains a is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Knockpy 4.1.1 contains a).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.59%
Remediation
Vendor / distro source
Affected products
vendor guelfoweb knock 4.1.1

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor guelfoweb knock 4.1.14.1.1

How to fix CVE-2020-36941

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2020-36941. EPSS is 0.59%. Act only if a listed version of Knockpy 4.1.1 contains a is installed.

Which versions are affected?

Compare what you have installed with guelfoweb knock 4.1.1 4.1.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.59%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 27, 2026 · EUVD

    Detected

    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.

  2. Mar 5, 2026 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2020-36941

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2020-36941

    30-day exploitation probability 0.59%

    first.org
  • EUVDVulnerability recordEUVD-2020-30859

    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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 6, 2026
  • CVE.orgNov 4, 2026
  • EUVDNov 2, 2026