Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2019-3855

CVE-2019-3855HIGH

The libssh2 Project libssh2 — An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way packets are read fr…

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  H  H  H    8.8   .0929   95.3     —

AFFECTED
  Product  Versions  Fixed
  libssh2  1.8.1 –   —

TIMELINE
  Jan 3   Reserved by redhat
  Mar 21  Published (CNA: redhat)
  Oct 14  RESCORED — CVE-2019-3855 (The libssh2 Project libssh2). CVSS 7.5 → 8.8 (NVD).

CWE-190, CWE-787 · CNA: redhat · CVSS v3.1 · 28 references · NVD status: Modified

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 packets are read from the server. 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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
January 3, 2019	Reserved	Reserved by redhat
March 21, 2019	Published	Published (CNA: redhat)
October 14, 2026	RESCORED	RESCORED — CVE-2019-3855 (The libssh2 Project libssh2). CVSS 7.5 → 8.8 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
The libssh2 Project	libssh2	—	1.8.1	—

Weaknesses

CWE-190 · CWE-787

References (28)

http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html [Mailing List, Third Party Advisory]
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html [Third Party Advisory]
http://packetstormsecurity.com/files/152136/Slackware-Security-Advisory-libssh2-Updates.html [Third Party Advisory, VDB Entry]
http://seclists.org/fulldisclosure/2019/Sep/42 [Mailing List, Third Party Advisory]
http://www.openwall.com/lists/oss-security/2019/03/18/3 [Mailing List, Patch, Third Party Advisory]
http://www.securityfocus.com/bid/107485 [Third Party Advisory, VDB Entry]
https://access.redhat.com/errata/RHSA-2019:0679 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:1175 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:1652 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:1791 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:1943 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:2399 [Third Party Advisory]
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3855 [Issue Tracking, Patch, Third Party Advisory]
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://lists.debian.org/debian-lts-announce/2019/03/msg00032.html [Mailing List, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/
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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCWEA5ZCLKRDUK62QVVYMFWLWKOPX3LO/
https://seclists.org/bugtraq/2019/Apr/25 [Mailing List, Third Party Advisory]
https://seclists.org/bugtraq/2019/Mar/25 [Mailing List, Third Party Advisory]
https://seclists.org/bugtraq/2019/Sep/49 [Mailing List, Third Party Advisory]
https://security.netapp.com/advisory/ntap-20190327-0005/ [Third Party Advisory]
https://support.apple.com/kb/HT210609 [Third Party Advisory]
https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-767 [Third Party Advisory]
https://www.debian.org/security/2019/dsa-4431 [Third Party Advisory]
https://www.libssh2.org/CVE-2019-3855.html [Patch, Vendor Advisory]
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html [Patch, Third Party Advisory]

Authoritative record: CVE-2019-3855 at cve.org

Vendors: the libssh2 project

Weaknesses: CWE-190 · CWE-787

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2019-3855 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.