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 ser…

Vulnerability class: Integer Overflow

EPSS: 0.038 (88.8th percentile) — read the EPSS interpretation.

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.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

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.