Is CVE-2015-4456 in the CISA KEV catalog?

No. CVE-2015-4456 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-4456?

CVE-2015-4456 has a CVSS v2 base score of 2.6 (LOW).

What is the EPSS score for CVE-2015-4456?

CVE-2015-4456 has an EPSS score of 0.83% (53th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-4456?

Upgrade owncloud-client on debian 12 to 1.8.4+dfsg-1 or later.

CVE & CISA-KEV Catalog

CVE-2015-4456

LOW

2.6

CVSS v2

NVD

Description

ownCloud Desktop Client before 1.8.2 does not call QNetworkReply::ignoreSslErrors with the list of errors to be ignored, which allows man-in-the-middle attackers to bypass the user's certificate distrust decision and obtain sensitive information by leveraging a self-signed certificate and a connection to a server using its own self-signed certificate.

How to fix

Remediation Available

owncloud-clientDebian

Fixed in:1.8.4+dfsg-1CVE-2015-4456

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

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

0.83%probability of exploitation in 30 days

53rdpercentile

Moderate risk: more likely to be exploited than 53% of all known CVEs.

References

Vendor Advisory1

owncloud.org

Other references3

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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 2026-05-06.