Integer overflow in Libssh2
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. 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.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.
EPSS exploit prediction
EPSS: 0.038 (89.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 89.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.038 · newest: 0.038 · change: +0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/libssh2/libssh2/blob/42d37aa63129a1b2644bf6495198923534322d64/src/pa… (Exploit, Third Party Advisory)
- blog.semmle.com/libssh2-integer-overflow-CVE-2019-17498/ (Broken Link)
- github.com/kevinbackhouse/SecurityExploits/tree/8cbdbbe6363510f7d9ceec685373da1… (Exploit, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2019-11/msg00026.html (vendor-advisory, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2019/11/msg00010.html (mailing-list, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- github.com/libssh2/libssh2/commit/dedcbd106f8e52d5586b0205bc7677e4c9868f9c (Patch, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/12/msg00013.html (mailing-list, Mailing List, Third Party Advisory)
- security.netapp.com/advisory/ntap-20220909-0004/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2019-17498?
- CVE-2019-17498 is a high-severity vulnerability in Libssh2, classified under Integer Overflow or Wraparound. CVSS score: 8.1/10. Published 2019-10-21.
- How severe is CVE-2019-17498?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2019-17498 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.