原文の説明
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)
悪用確認済み（CISA KEV）
- KEV 追加日
- 2026-09-10
- 対応期限（米連邦機関）
- 2026-09-13
- ランサムウェアでの使用
- Unknown
- 必要な対応
- 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.
詳細
- 公開日
- 2026-09-06
- 最終更新
- 2026-09-11
- CVSS ベクター
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N- CWE
- CWE-306
- EPSS（30日以内の悪用確率）
- 1.56% (パーセンタイル 76)
参考資料
- cve.org/CVE-2026-67277
- nvd.nist.gov/vuln/detail/CVE-2026-67277
- cert.pl/en/posts/2026/09/mikrotik-routeros-cve
- cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/
- npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain...
- mikrotik.com/supportsec/september-2026-vulnerability/
- forum.mikrotik.com/t/6-49-21-long-term-is-released/272802
- forum.mikrotik.com/t/7-23-4-long-term-is-released/272801
- forum.mikrotik.com/t/7-24-2-stable-is-released/272800
本製品は NVD API のデータを使用していますが、NVD による承認または認定を受けたものではありません。CVE® は The MITRE Corporation の登録商標です。CVE レコードは CVE Program の利用規約に基づいて使用しています。