How severe is CVE-2020-9588?

CVE-2020-9588 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-9588 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-9588?

CVE-2020-9588 primarily affects Magento. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-9588?

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-2020-9588 published?

CVE-2020-9588 was published on 2020-06-26 and last updated on 2026-06-17.

CVE-2020-9588

CVE-2020-9588 is a high-severity vulnerability in Magento with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-203.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 6.5
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-203
Affected product: Magento
Published: 2020-06-26
Last modified: 2026-06-17

Description

Magento versions 2.3.4 and earlier, 2.2.11 and earlier (see note), 1.14.4.4 and earlier, and 1.9.4.4 and earlier have an observable timing discrepancy vulnerability. Successful exploitation could lead to signature verification bypass.

Frequently asked questions

What is CVE-2020-9588?: Magento versions 2.3.4 and earlier, 2.2.11 and earlier (see note), 1.14.4.4 and earlier, and 1.9.4.4 and earlier have an observable timing discrepancy vulnerability. Successful exploitation could lead to signature verification bypass.
How severe is CVE-2020-9588?: CVE-2020-9588 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-9588 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-9588?: CVE-2020-9588 primarily affects Magento. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-9588?: 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-2020-9588 published?: CVE-2020-9588 was published on 2020-06-26 and last updated on 2026-06-17.

References

https://helpx.adobe.com/security/products/magento/apsb20-22.html

Affected products (4)

cpe:2.3:a:magento:magento:*:*:*:*:community:*:*:*
cpe:2.3:a:magento:magento:*:*:*:*:enterprise:*:*:*
cpe:2.3:a:magento:magento:*:*:*:*:commerce:*:*:*
cpe:2.3:a:magento:magento:*:*:*:*:open_source:*:*:*

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