CVE-2019-17498

Name: CVE-2019-17498
Creator: NVD / NIST
Published: 2019-10-21T22:15:10.523+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 3.76%

Last modified Jun 17, 2026

CVE-2019-17498 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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.. EPSS estimates a 3.76% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.1/10

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

EPSS Probability

3.76%

88.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-190

Affected Software

Vendor	Product	Versions
Libssh2	Libssh2	<= 1.9.0
Fedoraproject	Fedora	30
Fedoraproject	Fedora	31
Opensuse	Leap	15.1
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Netapp	Active Iq Unified Manager	All versions
Netapp	Element Software	All versions
Netapp	Hci Management Node	All versions
Netapp	Ontap Select Deploy Administration Utility	All versions
Netapp	Solidfire	All versions
Netapp	Bootstrap Os	All versions

References

http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00026.htmlMailing 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://github.com/kevinbackhouse/SecurityExploits/tree/8cbdbbe6363510f7d9ceec685373da12e6fc752d/libssh2/out_of_bounds_read_disconnect_CVE-2019-17498Exploit, Third Party Advisory
https://github.com/libssh2/libssh2/blob/42d37aa63129a1b2644bf6495198923534322d64/src/packet.c#L480Exploit, Third Party Advisory
https://github.com/libssh2/libssh2/commit/dedcbd106f8e52d5586b0205bc7677e4c9868f9cPatch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/11/msg00010.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00013.htmlMailing 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
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00026.htmlMailing 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://github.com/kevinbackhouse/SecurityExploits/tree/8cbdbbe6363510f7d9ceec685373da12e6fc752d/libssh2/out_of_bounds_read_disconnect_CVE-2019-17498Exploit, Third Party Advisory
https://github.com/libssh2/libssh2/blob/42d37aa63129a1b2644bf6495198923534322d64/src/packet.c#L480Exploit, Third Party Advisory
https://github.com/libssh2/libssh2/commit/dedcbd106f8e52d5586b0205bc7677e4c9868f9cPatch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/11/msg00010.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00013.htmlMailing 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

Timeline

Published: Oct 21, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-17498?

How severe is CVE-2019-17498?

CVE-2019-17498 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 3.76% probability of exploitation in the next 30 days.

How do I fix CVE-2019-17498?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-17498?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST