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CVE-2019-3856
An integer overflow flaw, which could lead to an out of bounds write, was discovered in libssh2 before 1.8.1 in the way keyboard prompt…
High7.5EPSS 6.1%
- Published
- Updated
- Reserved
- Assigned by
- redhat
Description
An integer overflow flaw, which could lead to an out of bounds write, was discovered in libssh2 before 1.8.1 in the way keyboard prompt requests are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.0 | High7.5 | CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 6.1% · top 6.5% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
- affected 1.8.1
References (17)
- https://www.libssh2.org/CVE-2019-3856.html (opens in a new tab)x_refsource_MISCx_transferred
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3856 (opens in a new tab)x_refsource_CONFIRMx_transferred
- [debian-lts-announce] 20190326 [SECURITY] [DLA 1730-1] libssh2 security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- https://security.netapp.com/advisory/ntap-20190327-0005/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- RHSA-2019:0679 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- openSUSE-SU-2019:1075 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- openSUSE-SU-2019:1109 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- FEDORA-2019-3348cb4934 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- DSA-4431 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- 20190415 [SECURITY] [DSA 4431-1] libssh2 security update (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- RHSA-2019:1175 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:1652 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:1791 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:1943 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:2399 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html (opens in a new tab)x_refsource_MISCx_transferred
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2019-3856)Record last updated .