CVE-2020-11881

mediumpriority · track · 41EPSS 0.038 · 90 %ileexploit · PoCEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

3.81% (90th) EPSS

CVSS 5 · medium

Is it mine?

3 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

An array index error in MikroTik RouterOS 6.41.3 through 6.46.5, and 7.x through 7.0 Beta5, allows an unauthenticated remote attacker to crash the SMB server via modified setup-request packets, aka SUP-12964.

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:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

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

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

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-129USprimary

exploits (1)

Public proof-of-concept and weaponised exploit code.

botlabsDev/CVE-2020-11881CVE-2020-11881: unauthenticated remote DoS for MikroTik SMB service.PoC · poc_in_github

affected products (3)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
mikrotik routeros6.41.3 → 6.46.5nvdUScpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*
mikrotik routeros= 7.0nvdUScpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2020-09-14modified 2026-06-17

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Related entries.

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+953 more

references (7)

External citations — patches, advisories, analysis.

https://github.com/botlabsDev/CVE-2020-11881 cnnvd
https://mikrotik.com cnnvd
https://nvd.nist.gov/vuln/detail/CVE-2020-11881 cnnvd
https://github.com/botlabsDev/CVE-2020-11881 enisa_euvd
https://mikrotik.com enisa_euvd
https://github.com/botlabsDev/CVE-2020-11881ExploitThird Party Advisorynvd
https://mikrotik.comVendor Advisorynvd

scry

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