CVE•Published 2019-03-25•Modified 2026-10-14•1 article on news•5 live references•NVD data

CVE-2019-3857Libssh2 · Libssh2

Vulnerability data via NVD (ingested)

CVSS v3.1

8.8

HIGH

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

EPSS percentile

Exploit Prediction Scoring System · top 7% of all CVEs

Weaknesses (CWE)

CWE-190Integer Overflow or Wraparound CWE-787Out-of-bounds Write

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 SSH_MSG_CHANNEL_REQUEST packets with an exit signal 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.

Timeline

Published 2019-03-25

Modified 2026-10-14

External references

NVD MITRE Exploit-DB trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2019-3857

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Libssh2 Libssh2"

All exposed Libssh2 Libssh2 instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Libssh2"

HTTP body or banner mentions "Libssh2" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2019-3857