CVE-2018-5389

Internet Key Exchange vulnerability

CVSS

5.9

EPSS

3.0%

EPSS pct

86th

Exploited

No known

The Internet Key Exchange v1 main mode is vulnerable to offline dictionary or brute force attacks. Reusing a key pair across different versions and modes of IKE could lead to cross-protocol authentication bypasses. It is well known, that the aggressive mode of IKEv1 PSK is vulnerable to offline dictionary or brute force attacks. For the main mode, however, only an online attack against PSK authentication was thought to be feasible. This vulnerability could allow an attacker to recover a weak Pre-Shared Key or enable the impersonation of a victim host or network.

Affected vendor

Ietf

Affected product

Internet Key Exchange

CVSS vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness type (CWE)

CWE-521 — Weak Password Requirements

Published

2018-09-06

Risk analysis

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

Its EPSS score of 3.0% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 86% of all scored CVEs.

Check your external exposure to CVE-2018-5389

Confirm whether Ietf Internet Key Exchange is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2018-5389.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2018-5389

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2018-5389 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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