CVE-2015-3146

high

Published 2016-04-13 · Modified 2026-05-06

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CVSS v3

7.5

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

CVSS v4 NEW

—

not yet in upstream

VIR risk

7.5

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.

Predictions

Exploit likelihood

83%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

OS	Version	Status	Fixed in
debian	bookworm	fixed	`0.6.3-4.2`
debian	bullseye	fixed	`0.6.3-4.2`
debian	forky	fixed	`0.6.3-4.2`
debian	sid	fixed	`0.6.3-4.2`
debian	trixie	fixed	`0.6.3-4.2`
ubuntu	12.04	affected
ubuntu	14.04	affected
ubuntu	15.10	affected
debian	7.0	affected
debian	8.0	affected
fedora	21	affected
fedora	22	affected

Application impact

Vendor	Product	Versions	Fixed
libssh	libssh	`{"endIncluding":"0.6.4"}`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.