CVE-2019-13115

Libssh2 vulnerability

CVSS

8.1

EPSS

11.7%

EPSS pct

96th

Exploited

No known

In libssh2 before 1.9.0, kex_method_diffie_hellman_group_exchange_sha256_key_exchange in kex.c has an integer overflow that could lead to an out-of-bounds read in the way packets are read from the server. A remote attacker who compromises a 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. This is related to an _libssh2_check_length mistake, and is different from the various issues fixed in 1.8.1, such as CVE-2019-3855.

Affected vendor

Libssh2

Affected product

Libssh2

CVSS vector

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

Weakness type (CWE)

CWE-125 — Out-of-bounds Read
CWE-190 — Integer Overflow or Wraparound

Published

2019-07-16

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, user interaction. Successful exploitation leads to high impact to confidentiality, high impact to availability.

Its EPSS score of 11.7% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2019-13115

Confirm whether Libssh2 Libssh2 is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2019-13115.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-13115

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