CVE-2026-67277

Katalog CVE

CVSS 8.2 · High KEV · sudah dieksploitasi EPSS 1,6%

Kerentanan Missing Authentication for Critical Function pada mikrotik routeros. Skor CVSS 3.1 8.2 (High) menurut NVD. Masuk katalog KEV CISA pada 10 September 2026, artinya sudah terbukti dieksploitasi.

Deskripsi (NVD)

RouterOS accepts a "related" btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With "random-data=false", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel. This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)

Advisory KUTIM-CSIRT

• Peringatan Keamanan: Tiga Kerentanan SSH dan btest MikroTik RouterOS Dieksploitasi Aktif, RouterOS v6 Ikut Terdampak 26 Sep 2026

Rincian

Terbit di NVD

5 September 2026

Terakhir diubah

11 September 2026

Status NVD

Analyzed

CVSS 3.1

8.2 (High), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-306: Missing Authentication for Critical Function

EPSS (30 hari)

1,6% peluang dieksploitasi; lebih tinggi dari 74,6% CVE lain

Known Exploited Vulnerabilities (CISA)

Nama

MikroTik RouterOS Missing Authentication for Critical Function Vulnerability

Masuk KEV

10 September 2026

Tenggat CISA

13 September 2026 (untuk instansi federal AS)

Ransomware

Belum tercatat

Tindakan wajib

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://mikrotik.com/supportsec/september-2026-vulnerability/ advisory vendor
• https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/ mitigasi · advisory pihak ketiga
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67277 pemerintah AS
• https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve advisory pihak ketiga
• https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/ exploit · advisory pihak ketiga
• https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802 release notes
• https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801 release notes
• https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800 release notes