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TI-2021-18517 Aliases CVE-2021-41987GHSA-5vgw-w2rf-gwww

In the SCEP Server of RouterOS in certain Mikrotik products, an attacker can trigger a…

Priority MEDIUM 52CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.16229 96th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:mikrotik:routeros:6.46.8:*:*:*:*:*:*:*6.46.8VulnerableMikroTik
cpe:2.3:o:mikrotik:routeros:6.47.9:*:*:*:*:*:*:*6.47.9VulnerableMikroTik
cpe:2.3:o:mikrotik:routeros:6.47.10:*:*:*:*:*:*:*6.47.10VulnerableMikroTik
  • cpe:2.3:o:mikrotik:routeros:6.46.8:*:*:*:*:*:*:* Versions 6.46.8 Vulnerable ·MikroTik
  • cpe:2.3:o:mikrotik:routeros:6.47.9:*:*:*:*:*:*:* Versions 6.47.9 Vulnerable ·MikroTik
  • cpe:2.3:o:mikrotik:routeros:6.47.10:*:*:*:*:*:*:* Versions 6.47.10 Vulnerable ·MikroTik

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-41987
  2. 2026-10-03 Alias added: GHSA-5vgw-w2rf-gwww

References

Exploit 1

Advisory 1

  • TI-2018-05369 A buffer overflow was found in the MikroTik RouterOS SMB service when processing NetBIOS… KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-58872 SSH session privilege manipulation via a crafted username in Mikrotik RouterOS KEVCVSS 4.0CRITICAL 9.2
  • TI-2018-10669 MikroTik RouterOS through 6.42 allows unauthenticated remote attackers to read arbitrary… KEVCVSS 3.1CRITICAL 9.1
  • TI-2026-47574 Kernel memory disclosure and denial of service in MikroTik RouterOS btest service KEVCVSS 4.0HIGH 8.8
  • TI-2026-47576 SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS KEVCVSS 4.0MEDIUM 6.9
  • TI-2022-22302 Out-of-bounds read in MicroTik RouterOS CVSS 3.1CRITICAL 9.8
See all 87 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences