How severe is CVE-2020-5604?

CVE-2020-5604 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-5604 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5604?

CVE-2020-5604 affects Mercari. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-5604?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-5604 published?

CVE-2020-5604 was published on 2020-07-09 and last updated on 2026-06-17.

CVE-2020-5604

CVE-2020-5604 is a high-severity vulnerability in Mercari with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Mercari
Published: 2020-07-09
Last modified: 2026-06-17

Description

Android App 'Mercari' (Japan version) prior to version 3.52.0 allows arbitrary method execution of a Java object by a remote attacker via a Man-In-The-Middle attack by using Java Reflection API of JavaScript code on WebView.

Frequently asked questions

What is CVE-2020-5604?: Android App 'Mercari' (Japan version) prior to version 3.52.0 allows arbitrary method execution of a Java object by a remote attacker via a Man-In-The-Middle attack by using Java Reflection API of JavaScript code on WebView.
How severe is CVE-2020-5604?: CVE-2020-5604 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-5604 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5604?: CVE-2020-5604 affects Mercari. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-5604?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-5604 published?: CVE-2020-5604 was published on 2020-07-09 and last updated on 2026-06-17.

References

https://jvn.jp/en/jp/JVN93167107/index.html

Affected products (1)

cpe:2.3:a:mercari:mercari:*:*:*:*:*:android:*:*

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