HOMEVULNERABILITIESCVE-2019-13115
HIGH

CVE-2019-13115

CWE-125Published: July 16, 2019· Updated: Jun 17, 2026

8.1
CVSS v3.1

Official Description

In libssh2 before 1.9.0, kex_method_diffie_hellman_group_exchange_sha256_key_exchange in kex.c has an integer overflow that could lead to an out-of-bounds read in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server. This is related to an _libssh2_check_length mistake, and is different from the various issues fixed in 1.8.1, such as CVE-2019-3855.

NVD Source

Technical Analysis

CVE-2019-13115 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), availability disruption (denial of service), with a CVSS base score of 8.1.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

Affected Vendors & Products

Debian1 product(s)
debian linux
f51 product(s)
traffix systems signaling delivery controller
Fedora1 product(s)
fedora
libssh21 product(s)
libssh2
netapp3 product(s)
cloud backupe-series santricity os controllerontap select deploy administration utility
Source: NVD CPE · 9 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://blog.semmle.com/libssh2-integer-overflow/
ADVISORYhttps://github.com/libssh2/libssh2/compare/02ecf17...42d37aa
ADVISORYhttps://github.com/libssh2/libssh2/pull/350
ADVISORYhttps://libssh2.org/changes.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/07/msg00024.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/12/msg00013.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20190806-0002/
ADVISORYhttps://support.f5.com/csp/article/K13322484
ADVISORYhttps://blog.semmle.com/libssh2-integer-overflow/
ADVISORYhttps://github.com/libssh2/libssh2/compare/02ecf17...42d37aa
ADVISORYhttps://github.com/libssh2/libssh2/pull/350
ADVISORYhttps://libssh2.org/changes.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/07/msg00024.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/12/msg00013.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20190806-0002/
ADVISORYhttps://support.f5.com/csp/article/K13322484

All References (30)

→
http://packetstormsecurity.com/files/172834/libssh2-1.8.2-Out-Of-Bounds-Read.html
→
https://blog.semmle.com/libssh2-integer-overflow/Exploit · Third Party Advisory
→
https://github.com/libssh2/libssh2/compare/02ecf17...42d37aaThird Party Advisory
→
https://github.com/libssh2/libssh2/pull/350Issue Tracking · Third Party Advisory
→
https://libssh2.org/changes.htmlRelease Notes · Vendor Advisory
→
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
→
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
→
https://lists.debian.org/debian-lts-announce/2019/07/msg00024.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/12/msg00013.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2023/09/msg00006.html
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6LUNHPW64IGCASZ4JQ2J5KDXNZN53DWW/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M7IF3LNHOA75O4WZWIHJLIRMA5LJUED3/
→
https://security.netapp.com/advisory/ntap-20190806-0002/Third Party Advisory
→
https://support.f5.com/csp/article/K13322484Third Party Advisory
→
https://support.f5.com/csp/article/K13322484?utm_source=f5support&amp%3Butm_medium=RSS

Quick Facts

CVE IDCVE-2019-13115
CVSS Score8.1 / 10
SeverityHIGH
WeaknessCWE-125
CISA KEVNo
Affected5 vendor(s)
PublishedJul 16, 2019

Related CVEs (CWE-125)

CVE-2021-41556
10.0
CVE-2017-14451
10.0
CVE-2021-21777
10.0
CVE-2009-2523
10.0
CVE-2013-0767
10.0
CVE-2023-26489
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-13115 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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