What is CVE-2019-3979?

CVE-2019-3979 is a high-severity vulnerability in Mikrotik Routeros, classified under Insufficient Verification of Data Authenticity. CVSS score: 7.5/10. Published 2019-10-29.

How severe is CVE-2019-3979?

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

Vulnerability in Mikrotik Routeros

CVE-2019-3979

RouterOS versions 6.45.6 Stable, 6.44.5 Long-term, and below are vulnerable to a DNS unrelated data attack. The router adds all A records to its DNS cache even when the records are unrelated to the domain that was queried. Therefore, a remote attacker controlled DNS server can poison the router's DNS cache via malicious responses with additional and untrue records.

EPSS: 0.009 (56.6th 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-345 — Insufficient Verification of Data Authenticity

References

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

Frequently asked questions

What is CVE-2019-3979?: CVE-2019-3979 is a high-severity vulnerability in Mikrotik Routeros, classified under Insufficient Verification of Data Authenticity. CVSS score: 7.5/10. Published 2019-10-29.
How severe is CVE-2019-3979?: High severity. CVSS v3 base score is 7.5 out of 10.