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CVE-2021-4031

24
FAUCET Score

CVE-2021-4031 describes a payment bypass vulnerability in Syltek application versions prior to 10.22.00. An attacker could exploit this flaw by forging requests to mark items as paid without actual payment, due to insufficient validation of product IDs. Rated 7.5 HIGH on the CVSS scale, this vulnerability is network-exploitable with low attack complexity, leading to high integrity impact (bypassing payment) without affecting confidentiality or availability. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 10.22.00CPE matchmatch criteria
cpe:2.3:a:syltek:syltek:*:*:*:*:*:*:*:*
>= 10.22.00, < 10.22.00CPE match
cpe:2.3:a:syltek:syltek:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.47%
Probability of exploitation in next 30 days
EPSS Percentile
37.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0047 is in the 16th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

incibe-cert.es / en/early-warning/security-advisories/syltek-insufficient-verification-data-authenticity
Third Party Advisory