HOMEVULNERABILITIESCVE-2019-17498
HIGH

CVE-2019-17498

CWE-190Published: October 21, 2019· Updated: Jun 17, 2026

8.1
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2019-17498 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), availability disruption (denial of service), with a CVSS base score of 8.1.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

Affected Vendors & Products

Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
libssh21 product(s)
libssh2
netapp7 product(s)
active iq unified managerelement softwarehci management nodeontap select deploy administration utilitysolidfirebootstrap oshci compute node
openSUSE1 product(s)
leap
Source: NVD CPE · 13 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/libssh2/libssh2/commit/dedcbd106f8e52d5586b0205bc7677e4c9868f9c
PATCHhttps://github.com/libssh2/libssh2/commit/dedcbd106f8e52d5586b0205bc7677e4c9868f9c
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-11/msg00026.html
ADVISORYhttps://github.com/kevinbackhouse/SecurityExploits/tree/8cbdbbe6363510f7d9ceec685373da12e6fc752d/libssh2/out_of_bounds_read_disconnect_CVE-2019-17498
ADVISORYhttps://github.com/libssh2/libssh2/blob/42d37aa63129a1b2644bf6495198923534322d64/src/packet.c#L480
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/11/msg00010.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/12/msg00013.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20220909-0004/
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-11/msg00026.html
ADVISORYhttps://github.com/kevinbackhouse/SecurityExploits/tree/8cbdbbe6363510f7d9ceec685373da12e6fc752d/libssh2/out_of_bounds_read_disconnect_CVE-2019-17498
ADVISORYhttps://github.com/libssh2/libssh2/blob/42d37aa63129a1b2644bf6495198923534322d64/src/packet.c#L480
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/11/msg00010.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/12/msg00013.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20220909-0004/

All References (24)

→
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

Quick Facts

CVE IDCVE-2019-17498
CVSS Score8.1 / 10
SeverityHIGH
WeaknessCWE-190
CISA KEVNo
Affected5 vendor(s)
PublishedOct 21, 2019

Related CVEs (CWE-190)

CVE-2013-2555
10.0
CVE-2012-5143
10.0
CVE-2010-3254
10.0
CVE-2010-1233
10.0
CVE-2012-5835
10.0
CVE-2015-5097
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-17498 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2019-17498·NVD