How severe is CVE-2019-3981?

CVE-2019-3981 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2019-3981 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-3981?

CVE-2019-3981 primarily affects Mikrotik Routeros. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-3981?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-3981 published?

CVE-2019-3981 was published on 2020-01-14 and last updated on 2026-06-17.

CVE-2019-3981

CVE-2019-3981 is a low-severity vulnerability in Mikrotik Routeros with a CVSS 3.x base score of 3.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-300.

Key facts

Severity: Low (CVSS 3.x base score 3.7)
CVSS v2: 4.3
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-300
Affected product: Mikrotik Routeros
Published: 2020-01-14
Last modified: 2026-06-17

Description

MikroTik Winbox 3.20 and below is vulnerable to man in the middle attacks. A man in the middle can downgrade the client's authentication protocol and recover the user's username and MD5 hashed password.

Frequently asked questions

What is CVE-2019-3981?: MikroTik Winbox 3.20 and below is vulnerable to man in the middle attacks. A man in the middle can downgrade the client's authentication protocol and recover the user's username and MD5 hashed password.
How severe is CVE-2019-3981?: CVE-2019-3981 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2019-3981 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-3981?: CVE-2019-3981 primarily affects Mikrotik Routeros. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-3981?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-3981 published?: CVE-2019-3981 was published on 2020-01-14 and last updated on 2026-06-17.

References

https://www.tenable.com/security/research/tra-2020-01

Affected products (2)

cpe:2.3:o:mikrotik:routeros:*:*:*:*:-:*:*:*
cpe:2.3:o:mikrotik:winbox:*:*:*:*:*:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

35.130.111.98 (ipv4-addr)