High severity7.5NVD Advisory· Published Apr 6, 2021· Updated Jun 17, 2026
CVE-2020-36285
CVE-2020-36285
Description
Union Pay up to 3.3.12, for iOS mobile apps, contains a CWE-347: Improper Verification of Cryptographic Signature vulnerability, allows attackers to shop for free in merchants' websites and mobile apps, via a crafted authentication code (MAC) which is generated based on a secret key which is NULL.
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Affected products
2- Union Pay/Union Paydescription
Patches
Vulnerability mechanics
References
3- www.dropbox.com/s/6smwnbrp0kgsgrc/poc_code.pynvdThird Party Advisory
- www.dropbox.com/s/czbkdr73tclq2nr/UnionPay_Vulnerability_Report.txtnvdThird Party Advisory
- mobitec.ie.cuhk.edu.hk/cve_2020/nvdPermissions Required
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