CVE•Published 2019-03-21•Modified 2026-10-14•1 article on news•5 live references•NVD data
CVE-2019-3859Libssh2 · Libssh2
Vulnerability data via NVD (ingested)
CVSS v3.1
9.1
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS percentile
93
Exploit Prediction Scoring System · top 7% of all CVEs
Weaknesses (CWE)
Description
An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the _libssh2_packet_require and _libssh2_packet_requirev functions. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.
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-2019-3859Hosts 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-2019-3859Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2019-3859Censys host search filtered to this CVE id.
grep.app
CVE-2019-3859Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2019-3859GitHub code search for direct mentions.
Google dork
"CVE-2019-3859" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.