Is CVE-2020-28339 in the CISA KEV catalog?

No. CVE-2020-28339 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-28339?

CVE-2020-28339 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-28339?

CVE-2020-28339 has an EPSS score of 1.88% (77th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-28339?

Upgrade welcart e-commerce to 1.9.36 or later.

CVE & CISA-KEV Catalog

CVE-2020-28339

HIGHEPSS 77th pctl

7.5

CVSS v3

NVD

Description

The usc-e-shop (aka Collne Welcart e-Commerce) plugin before 1.9.36 for WordPress allows Object Injection because of usces_unserialize. There is not a complete POP chain.

CWE-502Deserialization of Untrusted Data

How to fix

Remediation Available

welcart e-commerceNVD

Affected:< 1.9.36Fixed in:1.9.36CVE-2020-28339derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

1.88%probability of exploitation in 30 days

77thpercentile

Elevated risk: more likely to be exploited than 77% of all known CVEs.

References

Exploit1

wordfence.com

Third-Party Advisory1

wordpress.org

Related Vulnerabilities

Other CWE-502 (Deserialization of Untrusted Data) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-0669	High	7.2	100%	KEV + Ransom	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-35464	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-29300	Critical	9.8	100%	KEV + Ransom	-
CVE-2025-53770	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-47986	Critical	9.8	100%	KEV + Ransom	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-02-20.