NULL pointer dereference in libssh - CVE-2015-3146
Published: September 12, 2025
Vulnerability identifier: #VU115176
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2015-3146
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: libssh
Affected software:
libssh
libssh
Detailed vulnerability description
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error when handling SSH_MSG_NEWKEYS and SSH_MSG_KEXDH_REPLY packets in package_cb.c. A remote user can trigger denial of service conditions via a crafted SSH packet.
How to mitigate CVE-2015-3146
Install update from vendor's website.
Sources
- http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161802.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/158013.html
- http://www.debian.org/security/2016/dsa-3488
- http://www.ubuntu.com/usn/USN-2912-1
- https://git.libssh.org/projects/libssh.git/commit/?h=libssh-0.6.5&id=94f6955fbaee6fda9385a23e505497efe21f5b4f
- https://www.libssh.org/2015/04/30/libssh-0-6-5-security-and-bugfix-release/
- https://www.libssh.org/security/advisories/CVE-2015-3146.txt