No exploitation reportedFix available

CVE-2020-9588

Q: Is CVE-2020-9588 actively exploited?

Active exploitation of CVE-2020-9588 has not been confirmed. Its EPSS score was 2.9% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-9588?

CVE-2020-9588 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2020-06-26
WeaknessCWE-203

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2020-06-2621:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-9588?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-9588?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Magento

Branch	Affected	Fixed in	Source
1.9	≤ 1.9.4.4	no fix published	NVD
1.14	≤ 1.14.4.4	no fix published	NVD
2.2	≥ 2.2.0, ≤ 2.2.11	no fix published	NVD
2.3	≥ 2.3.0, ≤ 2.3.4	no fix published	NVD

magento

Branch	Affected	Fixed in	Source
2.3	≥ 2.3.0, < 2.3.5	2.3.5	OSV
2.2	≥ 2.2.0, < 2.2.12	2.2.12	OSV

magento/community-edition

Branch	Affected	Fixed in	Source
2.3	< 2.3.4-p2	2.3.4-p2	OSV

2 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

helpx.adobe.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.2read 2026-10-23
NVDCVSS 2.06.5read 2026-10-23
NVDweakness (CWE)CWE-203read 2026-10-23
FIRST EPSSEPSS score2.9 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Published: 2020-06-26
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-9588?

Is CVE-2020-9588 actively exploited?

Active exploitation of CVE-2020-9588 has not been confirmed. Its EPSS score was 2.9% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-9588?

CVE-2020-9588 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

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