CVE-2020-23533: Union Pay up to 1.2.0, for web based versions contains a CWE-347: Improper Verification of Cryptographic Signa

Q: How do I fix CVE-2020-23533?

union pay: upgrade to newer than 1.2.0. Exact commands for each OS are on this page.

Q: Is CVE-2020-23533 being exploited?

CVE-2020-23533 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-23533 affect?

CVE-2020-23533 affects union pay. Severity is high (CVSS 7.5). Union Pay up to 1.2.0, for web based versions 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 (M

Q: How urgent is CVE-2020-23533?

Priority 46/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2020-23533 is a high-severity flaw (CVSS 7.5) affecting union pay. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Union Pay up to 1.2.0, for web based versions 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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-347
Published	2021-04-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: unionpayintl

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-04-06 16:15 UTCPublished CVE record published
2026-06-17 03:04 UTCUpdated Record last modified

unionpayintl union pay UPGRADE

Affected: <= 1.2.0

Fixed in: newer than 1.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy union-pay || rpm -q union-pay || union-pay --version

2. UPGRADE to newer than 1.2.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade union-pay

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade union-pay

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-23533?

union pay: upgrade to newer than 1.2.0. Exact commands for each OS are on this page.

Is CVE-2020-23533 being exploited?

CVE-2020-23533 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-23533 affect?

CVE-2020-23533 affects union pay. Severity is high (CVSS 7.5). Union Pay up to 1.2.0, for web based versions 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 (M

How urgent is CVE-2020-23533?

Priority 46/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-36285 HIGH 7.5 UPGRADE Union Pay up to 3.3.12, for iOS mobile apps, contains a CWE-347: Improper Verification of Cryptographic Signat
CVE-2020-36284 HIGH 7.5 UPGRADE Union Pay up to 3.4.93.4.9, for android, contains a CWE-347: Improper Verification of Cryptographic Signature

References

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