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-2019-17498

CVE-2019-17498HIGH

n/a n/a — In libssh2 v1.9.0 and earlier versions, the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, enabling an a…

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  H  N  H    8.1   .0381   89.9     —

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Oct 11  Reserved by mitre
  Oct 21  Published (CNA: mitre)
  Oct 14  ENRICHED — CVE-2019-17498. Received CVSS 8.1 and CPE data from NVD.
  Oct 14  EXPLOIT PUBLISHED — CVE-2019-17498. Public exploit reference added.

CWE-190 · CNA: mitre · CVSS v3.1 · 13 references · NVD status: Modified

Description

In libssh2 v1.9.0 and earlier versions, the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, enabling an attacker to specify an arbitrary (out-of-bounds) offset for a subsequent memory read. A crafted SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
October 11, 2019	Reserved	Reserved by mitre
October 21, 2019	Published	Published (CNA: mitre)
October 14, 2026	ENRICHED	ENRICHED — CVE-2019-17498. Received CVSS 8.1 and CPE data from NVD.
October 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2019-17498. Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-190

References (13)

http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00026.html [Mailing List, Third Party Advisory]
http://packetstormsecurity.com/files/172835/libssh2-1.9.0-Out-Of-Bounds-Read.html
https://blog.semmle.com/libssh2-integer-overflow-CVE-2019-17498/ [Broken Link]
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://github.com/kevinbackhouse/SecurityExploits/tree/8cbdbbe6363510f7d9ceec685373da12e6fc752d/libssh2/out_of_bounds_read_disconnect_CVE-2019-17498 [Exploit, Third Party Advisory]
https://github.com/libssh2/libssh2/blob/42d37aa63129a1b2644bf6495198923534322d64/src/packet.c#L480 [Exploit, Third Party Advisory]
https://github.com/libssh2/libssh2/commit/dedcbd106f8e52d5586b0205bc7677e4c9868f9c [Patch, Third Party Advisory]
https://lists.debian.org/debian-lts-announce/2019/11/msg00010.html [Mailing List, Third Party Advisory]
https://lists.debian.org/debian-lts-announce/2021/12/msg00013.html [Mailing List, Third Party Advisory]
https://lists.debian.org/debian-lts-announce/2023/09/msg00006.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/22H4Q5XMGS3QNSA7OCL3U7UQZ4NXMR5O/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TY7EEE34RFKCTXTMBQQWWSLXZWSCXNDB/
https://security.netapp.com/advisory/ntap-20220909-0004/ [Third Party Advisory]

Authoritative record: CVE-2019-17498 at cve.org

Weaknesses: CWE-190

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2019-17498 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.