CVE•Published 2019-03-21•Modified 2026-10-14•1 article on news•6 live references•NVD data
CVE-2019-3855Libssh2 · 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
95
Exploit Prediction Scoring System · top 5% of all CVEs
Weaknesses (CWE)
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.
Timeline
Published 2019-03-21
Modified 2026-10-14
External references
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-2019-3855Hosts 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-2019-3855Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2019-3855Censys host search filtered to this CVE id.
grep.app
CVE-2019-3855Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2019-3855GitHub code search for direct mentions.
Google dork
"CVE-2019-3855" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.