CVE-2019-3943

Routeros vulnerability

CVSS

8.1

EPSS

3.7%

EPSS pct

89th

Exploited

No known

MikroTik RouterOS versions Stable 6.43.12 and below, Long-term 6.42.12 and below, and Testing 6.44beta75 and below are vulnerable to an authenticated, remote directory traversal via the HTTP or Winbox interfaces. An authenticated, remote attack can use this vulnerability to read and write files outside of the sandbox directory (/rw/disk).

Affected vendor

Mikrotik

Affected product

Routeros

CVSS vector

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

Weakness type (CWE)

CWE-23
CWE-22 — Path Traversal

Published

2019-04-10

Risk analysis

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

Its EPSS score of 3.7% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 89% of all scored CVEs.

Check your external exposure to CVE-2019-3943

Confirm whether Mikrotik Routeros is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2019-3943.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-3943

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-3943 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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