Vulnerability in Guelfoweb Knock
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (45.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001
Affected products
- Guelfoweb Knock — versions 4.1.1
- Guelfoweb Knockpy — versions 4.1.1
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/49342 (Exploit, Third Party Advisory, exploit)
- github.com/guelfoweb/knock (Product, product)
- www.vulncheck.com/advisories/knockpy-csv-injection (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2020-36941?
- CVE-2020-36941 is a critical-severity vulnerability in Guelfoweb Knock, classified under Improper Neutralization of Formula Elements in a CSV File. CVSS score: 9.8/10. Published 2026-01-27.
- How severe is CVE-2020-36941?
- Critical severity. CVSS v3 base score is 9.8 out of 10.