CVE-2020-37168
CVE-2020-37168 is a critical-severity vulnerability 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-328.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v4: 9.3
- EPSS exploit prediction: 0% (16th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2020-31214
- Weakness: CWE-328
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2020-37168?
- 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.
- How severe is CVE-2020-37168?
- CVE-2020-37168 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-2020-37168 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2020-37168?
- 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-2020-37168 have an EU (EUVD) identifier?
- Yes. CVE-2020-37168 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2020-31214.
- When was CVE-2020-37168 published?
- CVE-2020-37168 was published on 2026-05-13 and last updated on 2026-06-17.
References
- https://paiement.systempay.fr/doc/fr-FR/
- https://paiement.systempay.fr/doc/fr-FR/module-de-paiement-gratuit/
- https://www.exploit-db.com/exploits/48017
- https://www.vulncheck.com/advisories/ecommerce-systempay-production-key-brute-force
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