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CVE-2020-36284

HIGH
7.5
CVSS Score
Published: April 6, 2021 at 03:36 PM UTC
Updated: June 17, 2026 at 03:15 AM UTC
1 product affected across 1 vendorUnion Pay

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Severity
HIGH7.5
Exploit prediction
EPSS 0.9%

Description

Union Pay up to 3.4.93.4.9, for android, 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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Union Pay· Unionpayintl
95%
v ≤ 3.4.93.4.9

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_MISCPermissions Required
Source: [email protected]
http://mobitec.ie.cuhk.edu.hk/cve_2020/
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://www.dropbox.com/s/6smwnbrp0kgsgrc/poc_code.py?dl=0
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://www.dropbox.com/s/czbkdr73tclq2nr/UnionPay_Vulnerability_Report.txt?dl=0

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-347

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