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Public proof of conceptFix available

CVE-2019-13115

A public proof of concept exists; no exploitation attested.

  • Published2019-07-16
  • Fixed in1.9.0
  • WeaknessCWE-125 · CWE-190

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2019-07-1618:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-13115?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-13115?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Libssh2
BranchAffectedFixed in
1.9< 1.9.01.9.0
Debian debian linux
BranchAffectedFixed in
8.0= 8.0no fix published
9.0= 9.0no fix published
Fedoraproject fedora
BranchAffectedFixed in
29.x= 29no fix published
30.x= 30no fix published

4 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libssh2Ubuntu:Pro:20.04:LTSall versions · no fixed version listed
  • libssh2Ubuntu:Pro:18.04:LTSall versions · no fixed version listed
  • libssh2Ubuntu:Pro:16.04:LTSall versions · fixed in 1.5.0-2ubuntu0.1+esm1
  • libssh2Ubuntu:Pro:14.04:LTSall versions · fixed in 1.4.3-2ubuntu0.2+esm2
  • libssh2TuxCare:CentOS:6all versions · fixed in 1.4.2-3.0.1.el6_10.1.tuxcare.els3and 2 other packages
  • libssh2Debian:14all versions · fixed in 1.9.0-1
  • libssh2Debian:13all versions · fixed in 1.9.0-1
  • libssh2Debian:12all versions · fixed in 1.9.0-1

21 more package ranges on OSV.dev

Vendor advisories

  • CVE-2019-13115 Red Hat Product Security12 known affected

    libssh2: integer overflow in kex_method_diffie_hellman_group_exchange_sha256_key_exchange in kex.c leads to out-of-bounds write

    libssh2 as a component of Red Hat Enterprise Linux 6 · libssh2-devel as a component of Red Hat Enterprise Linux 6 · libssh2-docs as a component of Red Hat Enterprise Linux 6 · +9 more

Full record on NVD

Fix

  1. Update Libssh2 to 1.9.0
  2. No fix planned, says the vendor Red Hat Product Security CVE-2019-13115 · 4 productsOut of support scope
  3. No fix planned, says the vendor Red Hat Product Security CVE-2019-13115 · 8 productsWill not fix

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
2 repositories, unverifiedviz27/Libssh2-ExploitCSSProject/libssh2-Exploit
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.18.1read 2026-10-23
  • NVDCVSS 2.05.8read 2026-10-23
  • NVDweakness (CWE)CWE-125, CWE-190read 2026-10-23
  • FIRST EPSSEPSS score11.7 %read 2026-11-03
  • PoC-in-GitHubproof of concept2read 2026-11-03
  • OSVaffected packages—

Identifiers

  • EUVD-2019-4656same flawENISA EUVD · LicenseRef-ENISA-legal-notice
  • DLA-1730-3advisory covering several CVEsDebian · LicenseRef-unstated
  • DLA-2848-1advisory covering several CVEsDebian · LicenseRef-unstated
  • DLA-3559-1advisory covering several CVEsDebian · LicenseRef-unstated
  • USN-5308-1advisory covering several CVEsUbuntu

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Published
2019-07-16
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2019-13115?

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.

Is CVE-2019-13115 actively exploited?

Active exploitation of CVE-2019-13115 has not been confirmed. Its EPSS score was 11.7% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-13115?

CVE-2019-13115 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.

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