Is CVE-2015-5352 in the CISA KEV catalog?

No. CVE-2015-5352 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-5352?

CVE-2015-5352 has a CVSS v2 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2015-5352?

CVE-2015-5352 has an EPSS score of 5.45% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-5352?

Upgrade openssh on debian 11 to 1:6.9p1-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2015-5352

MEDIUMEPSS 92th pctl

4.3

CVSS v2

NVD

Description

The x11_open_helper function in channels.c in ssh in OpenSSH before 6.9, when ForwardX11Trusted mode is not used, lacks a check of the refusal deadline for X connections, which makes it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time window.

CWE-264Permissions, Privileges, and Access Controls

How to fix

Remediation Available

opensshDebian

Fixed in:1:6.9p1-1CVE-2015-5352

opensshUbuntu

Fixed in:1:6.6p1-2ubuntu2.2USN-2710-1

openssh-serverUbuntu

Fixed in:1:6.6p1-2ubuntu2.2USN-2710-1

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

5.45%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Vendor Advisory1

openssh.com

Other references14

Related Vulnerabilities

Other CWE-264 (Permissions, Privileges, and Access Controls) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2012-1456	Medium	4.3	100%	-	-
CVE-2012-1459	Medium	4.3	100%	-	Fix
CVE-2012-1446	Medium	4.3	100%	-	-
CVE-2012-1443	Medium	4.3	100%	-	-
CVE-2012-1442	Medium	4.3	99%	-	-
CVE-2012-1457	Medium	4.3	98%	-	Fix

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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.