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Fencer Intel
high 7.5

CVE-2015-3146 json

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,…

published 2016-04-13 10 y ago modified 2026-06-17 4 mo ago also EUVD-2015-3227

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.0%
EPSS 4.0% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

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.

Patch / fix

  • libssh Debian 14, Debian 13, Debian 12 0.6.3-4.2

debian advisories DEBIAN-CVE-2015-3146

  • libssh Ubuntu 14.04 LTS 0.6.1-0ubuntu3.3

ubuntu advisories UBUNTU-CVE-2015-3146

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libssh SLED 12, SLE Workstation Extension 12, SLE Software Development Kit 12 0.6.3-8.1

suse advisories SUSE-SU-2015:1707-1SUSE-SU-2015:1707-2

  • libssh openSUSE Tumbleweed 0.7.2-2.1

opensuse advisories openSUSE-SU-2024:10036-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-3146 updated cvss 5.0

libssh: null pointer dereference due to a logical error in the handling of a SSH_MSG_NEWKEYS and KEXDH_REPLY packets

  • Red Hat Enterprise Linux 7 libssh
    affected: no fix available

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.96% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.