CVE-2019-3924

mediumpriority · attend · 45EPSS 0.157 · 97 %ileexploit · functionalEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · functional

Likely / severe?

15.7% (97th) EPSS

CVSS 5 · medium

Is it mine?

5 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-23

MikroTik RouterOS before 6.43.12 (stable) and 6.42.12 (long-term) is vulnerable to an intermediary vulnerability. The software will execute user defined network requests to both WAN and LAN clients. A remote unauthenticated attacker can use this vulnerability to bypass the router's firewall or for general network scanning activities.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.17.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Psecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-441USprimaryCWE-269US

exploits (1)

Public proof-of-concept and weaponised exploit code.

EDB-46444MikroTik RouterOS < 6.43.12 (stable) / < 6.42.12 (long-term) - Firewall and NAT Bypassfunctional · exploit_db

affected products (5)

Products and version ranges known to be affected.

Tenable MikroTik RouterOS≤ RouterOS long-term 6.42.11 and below, RouterOS stable 6.43.11 and belowenisa_euvdEU
MikroTik RouterOS≤ 6.42.12fstec_bduRU
MikroTik RouterOS≤ 6.43.12fstec_bduRU
mikrotik routeros< 6.42.12nvdUScpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*
mikrotik routeros< 6.43.12nvdUScpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2019-02-20modified 2026-06-26

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+236 more

references (14)

External citations — patches, advisories, analysis.

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