CVE-2019-17498
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.81%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.1 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
- EPSS
- 3.81% probability · 90th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-190
- Affected
- libssh2/libssh2 · fedoraproject/fedora · opensuse/leap · debian/debian linux · netapp/active iq unified manager · netapp/element software · netapp/hci management node · netapp/ontap select deploy administration utility · netapp/solidfire · netapp/bootstrap os
- Source
- cve@mitre.org
EPSS 3.8% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.