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Vulnerability record · CVE-2021-41987 · published 16 March 2022

CVE-2021-41987: Mikrotik routeros out-of-bounds write vulnerability

Mikrotik · Routeros

In the SCEP Server of RouterOS in certain Mikrotik products, an attacker can trigger a heap-based buffer overflow that leads to remote code execution. The attacker must know the scep_server_name value. This affects RouterOS 6.46.8, 6.47.9, and 6.47.10.

8.1 CVSS 3.1 High EPSS 16% · top 3.2% CWE-787 · Out-of-bounds write
8.1CVSS 3.1 base score, v2 6.8
16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

In the SCEP Server of RouterOS in certain Mikrotik products, an attacker can trigger a heap-based buffer overflow that leads to remote code execution. The attacker must know the scep_server_name value. This affects RouterOS 6.46.8, 6.47.9, and 6.47.10.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://mikrotik.com/download/archive Release NotesVendor Advisory
https://teamt5.org/en/posts/vulnerability-mikrotik-cve-2021-41987/ ExploitThird Party Advisory
https://mikrotik.com/download/archive Release NotesVendor Advisory
https://teamt5.org/en/posts/vulnerability-mikrotik-cve-2021-41987/ ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-41987), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.