How severe is CVE-2021-4031?

CVE-2021-4031 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2021-4031 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-4031?

CVE-2021-4031 affects Syltek. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-4031?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-4031 published?

CVE-2021-4031 was published on 2022-03-18 and last updated on 2026-06-17.

CVE-2021-4031

CVE-2021-4031 is a high-severity vulnerability in Syltek with a CVSS 3.x base score of 7.5. 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-345.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-345
Affected product: Syltek
Published: 2022-03-18
Last modified: 2026-06-17

Description

Syltek application before its 10.22.00 version, does not correctly check that a product ID has a valid payment associated to it. This could allow an attacker to forge a request and bypass the payment system by marking items as payed without any verification.

Frequently asked questions

What is CVE-2021-4031?: Syltek application before its 10.22.00 version, does not correctly check that a product ID has a valid payment associated to it. This could allow an attacker to forge a request and bypass the payment system by marking items as payed without any verification.
How severe is CVE-2021-4031?: CVE-2021-4031 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2021-4031 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-4031?: CVE-2021-4031 affects Syltek. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-4031?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-4031 published?: CVE-2021-4031 was published on 2022-03-18 and last updated on 2026-06-17.

References

https://www.incibe-cert.es/en/early-warning/security-advisories/syltek-insufficient-verification-data-authenticity

Affected products (1)

cpe:2.3:a:syltek:syltek:*:*:*:*:*:*:*:*

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