What is CVE-2019-3977?

CVE-2019-3977 is a high-severity vulnerability in Mikrotik Routeros, classified under Download of Code Without Integrity Check. CVSS score: 7.5/10. Published 2019-10-29.

How severe is CVE-2019-3977?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Mikrotik Routeros

CVE-2019-3977

RouterOS 6.45.6 Stable, RouterOS 6.44.5 Long-term, and below insufficiently validate where upgrade packages are download from when using the autoupgrade feature. Therefore, a remote attacker can trick the router into "upgrading" to an older version of RouterOS and possibly reseting all the system's usernames and passwords.

EPSS: 0.011 (61.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Mikrotik Routeros
N/a Mikrotik Routeros — versions RouterOS 6.45.6 Stable and below. RouterOS 6.44.5 Long-term and below.

Weakness classification (CWE)

CWE-494 — Download of Code Without Integrity Check

References

vulnreport@tenable.com (Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2019-3977?: CVE-2019-3977 is a high-severity vulnerability in Mikrotik Routeros, classified under Download of Code Without Integrity Check. CVSS score: 7.5/10. Published 2019-10-29.
How severe is CVE-2019-3977?: High severity. CVSS v3 base score is 7.5 out of 10.