CVE-2015-4456

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.

Published: 2015-10-26 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-4456 is rated Low Risk (23.7/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.16%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2015-4456

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-06-26 0.15% 0.16% +0.01%
2 2025-03-30 0.31% 0.15% -0.16%
3 2025-03-29 — 0.31% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-4456

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
2.6 2.0 LOW
AV:N/AC:H/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:H)
Exploitation requires uncommon or highly specific conditions.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 4.9 2.9 [email protected]

Weakness enumeration for CVE-2015-4456

OS Trackers for CVE-2015-4456

vendor priority summary link
debian not yet assigned CVE-2015-4456 not yet assigned priority: Debian including 1 source packages (owncloud-client), 4 status rows across 4 suites (bookworm, forky, sid, trixie): resolved 4. https://security-tracker.debian.org/tracker/CVE-2015-4456
ubuntu medium CVE-2015-4456 medium priority: Ubuntu including 1 source packages (owncloud-client), 12 status rows across 12 suites (artful, bionic, cosmic, disco, precise, trusty, upstream, vivid, wily, xenial, yakkety, zesty): ignored 4, not-affected 4, DNE 2, released 2. https://ubuntu.com/security/CVE-2015-4456

NVD evaluator notes for CVE-2015-4456

Comment: <a href="http://cwe.mitre.org/data/definitions/297.html" target="_blank">CWE-297: Improper Validation of Certificate with Host Mismatch</a>

Affected software / configurations for CVE-2015-4456

Vendor Product Version Raw CPE
owncloud owncloud_desktop_client <= 1.8.1 cpe:2.3:a:owncloud:owncloud_desktop_client:*:*:*:*:*:*:*:*

References for CVE-2015-4456

cvelogic Threat Intelligence