Vulnerability · Published Sep 12, 2025 · Assigned by SEC-VLab
CVE-2025-8699
Critical 9.1
In plain English
A critical-severity security flaw in Stored Value Unattended Payment Solution from KioSoft. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities).
Official description
Some "Stored Value" Unattended Payment Solutions of KioSoft use vulnerable NFC cards. Attackers could potentially use this vulnerability to change the balance on the cards and generate money. The account balance is stored on an insecure MiFare Classic NFC card and can be read and written back. By carefully observing changes in card dumps, one can identify fields that store the cash value of the card. Additionally, a checksum can be identified, which is created by XOR-ing the cash and an unknown field with a certain value. By updating the fields accordingly, arbitrary amounts of money can be loaded onto the card (up to $655,35) to pay for goods.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| KioSoft | Stored Value Unattended Payment Solution | Current firmware/hardware as of Q2/2025 |
Weakness: CWE-922 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
References
- https://r.sec-consult.com/kiosoft third-party-advisory
- http://seclists.org/fulldisclosure/2025/Sep/33