CVE-2020-37168

CRITICAL

Ecommerce Systempay 1.0 Production Key Brute Force

Title source: cna
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2020-37168. PoCs published by live3.

AI-analyzed exploit summary This PHP script performs a brute-force attack to recover the production key used by Ecommerce Systempay for signature validation. It reconstructs the signature from intercepted POST data and iterates through possible keys to find a match.

Description

Ecommerce Systempay 1.0 contains a weak cryptographic implementation vulnerability that allows attackers to brute force the 16-character production secret key used for payment signature generation. Attackers can extract payment form data and signatures from POST requests to the payment endpoint, then use SHA1 hash comparison to iteratively test key candidates until discovering the correct production key, enabling them to forge valid payment signatures and manipulate transaction amounts.

Exploits (1)

exploitdb WORKING POC
by live3 · phpwebappsphp
https://www.exploit-db.com/exploits/48017

This PHP script performs a brute-force attack to recover the production key used by Ecommerce Systempay for signature validation. It reconstructs the signature from intercepted POST data and iterates through possible keys to find a match.

Classification
Working Poc 95%
Attack Type
Auth Bypass
Complexity
Moderate
Reliability
Reliable
Target: Ecommerce Systempay 1.0
No auth needed
Prerequisites: Intercepted POST data from a Systempay payment form · SHA1-signed signature for validation
devstral-2 · analyzed May 13, 2026 Full analysis →

References (4)

Core 4
Core References
Exploit exploit
ExploitDB-48017
https://www.exploit-db.com/exploits/48017
Product product
Official Product Homepage
https://paiement.systempay.fr/doc/fr-FR/
Third Party Advisory third-party-advisory
VulnCheck Advisory: Ecommerce Systempay 1.0 Production Key Brute Force
https://www.vulncheck.com/advisories/ecommerce-systempay-production-key-brute-force

Scores

CVSS v3 9.8
EPSS 0.0025
EPSS Percentile 15.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact total

Details

CWE
CWE-328
Status published
Products (1)
Paiement/Ecommerce Systempay 1.0
Published May 13, 2026
Tracked Since May 13, 2026