Is CVE-2015-3146 in the CISA KEV catalog?

No. CVE-2015-3146 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-3146?

CVE-2015-3146 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2015-3146?

CVE-2015-3146 has an EPSS score of 3.91% (89th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-3146?

Upgrade libssh on debian 11 to 0.6.3-4.2 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2015-3146

HIGHEPSS 89th pctl

7.5

CVSS v3

NVD

Description

The (1) SSH_MSG_NEWKEYS and (2) SSH_MSG_KEXDH_REPLY packet handlers in package_cb.c in libssh before 0.6.5 do not properly validate state, which allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a crafted SSH packet.

How to fix

Remediation Available

libsshDebian

Fixed in:0.6.3-4.2CVE-2015-3146

libsshUbuntu

Fixed in:0.6.1-0ubuntu3.3USN-2912-1

libssh-4Ubuntu

Fixed in:0.6.1-0ubuntu3.3USN-2912-1

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 ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

3.91%probability of exploitation in 30 days

89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

Vendor Advisory2

Other references5

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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.