CVE-2019-3856

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

6.13% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 93.3% of scored records. A rank, not a probability.

NVD base score

8.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-10-14.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2019-03-25 18:31Z7 YR AGO

Last updated

2026-10-14 06:35Z15 DAYS AGO

Reserved

2019-01-03

Assigning CNA

redhat

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

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

Weaknesses

• CWE-190Integer Overflow or WraparoundBase
• CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

59b5ea590cbde2f2850dc42bf1a81282a3a481a334bd01d64dce83e5a01eb354

• www.libssh2.orghttps://www.libssh2.org/CVE-2019-3856.htmlx_refsource_MISC
• bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3856x_refsource_CONFIRM
• lists.debian.org[debian-lts-announce] 20190326 [SECURITY] [DLA 1730-1] libssh2 security updatehttps://lists.debian.org/debian-lts-announce/2019/03/msg00032.htmlmailing-listx_refsource_MLIST
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20190327-0005/x_refsource_CONFIRM
• access.redhat.comRHSA-2019:0679https://access.redhat.com/errata/RHSA-2019:0679vendor-advisoryx_refsource_REDHAT
• lists.opensuse.orgopenSUSE-SU-2019:1075http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.htmlvendor-advisoryx_refsource_SUSE
• lists.opensuse.orgopenSUSE-SU-2019:1109http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.htmlvendor-advisoryx_refsource_SUSE
• lists.fedoraproject.orgFEDORA-2019-3348cb4934https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/vendor-advisoryx_refsource_FEDORA
• www.debian.orgDSA-4431https://www.debian.org/security/2019/dsa-4431vendor-advisoryx_refsource_DEBIAN
• seclists.org20190415 [SECURITY] [DSA 4431-1] libssh2 security updatehttps://seclists.org/bugtraq/2019/Apr/25mailing-listx_refsource_BUGTRAQ
• access.redhat.comRHSA-2019:1175https://access.redhat.com/errata/RHSA-2019:1175vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2019:1652https://access.redhat.com/errata/RHSA-2019:1652vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2019:1791https://access.redhat.com/errata/RHSA-2019:1791vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2019:1943https://access.redhat.com/errata/RHSA-2019:1943vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2019:2399https://access.redhat.com/errata/RHSA-2019:2399vendor-advisoryx_refsource_REDHAT
• www.oracle.comhttps://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.htmlx_refsource_MISC
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-398330.html