{ "document": { "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "nl", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions:\n\n NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein.\n\n NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory.\n This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." }, { "category": "description", "text": "MikroTik heeft meerdere kwetsbaarheden verholpen in RouterOS.", "title": "Feiten" }, { "category": "description", "text": "De eerste kwetsbaarheid betreft een fout in de SSH-authenticatiemechanisme waarbij de exponent van RSA-sleutels niet werd geverifieerd. Hierdoor kunnen aanvallers RSA-handtekeningen vervalsen en ongeautoriseerde SSH-toegang verkrijgen. De tweede kwetsbaarheid betreft een probleem met gebruikersnamen die beginnen met een verboden teken, waardoor de trusted policy mask kan worden gemanipuleerd en privilege escalation mogelijk is binnen het SSH-loginproces. De derde kwetsbaarheid maakt het mogelijk voor niet-geauthenticeerde clients om een IPv4 UDP-test te starten die door onjuiste verwerking van pakketten in de kernel kan leiden tot kernel restarts, wat de beschikbaarheid van het systeem beïnvloedt.\n\nCERT Polen geeft aan actief misbruik te hebben waargenomen, gericht op routers waarbij de SSH service publiek toegankelijk is. In deze gevallen zijn meerdere van bovenstaande kwetsbaarheden gecombineerd om volledige controle over de getroffen routers te verkrijgen. Het is goed gebruik om SSH toegang niet open te stellen aan het internet, maar af te schermen via een VPN en/of whitelist.", "title": "Interpretaties" }, { "category": "description", "text": "MikroTik heeft updates uitgebracht in RouterOS versies 6.49.21, 7.23.4 en 7.24.2 om deze kwetsbaarheden te verhelpen. Zie bijgevoegde referenties voor meer informatie.", "title": "Oplossingen" }, { "category": "general", "text": "medium", "title": "Kans" }, { "category": "general", "text": "high", "title": "Schade" }, { "category": "general", "text": "Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')", "title": "CWE-88" }, { "category": "general", "text": "Integer Underflow (Wrap or Wraparound)", "title": "CWE-191" }, { "category": "general", "text": "Missing Authentication for Critical Function", "title": "CWE-306" }, { "category": "general", "text": "Improper Verification of Cryptographic Signature", "title": "CWE-347" } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "Nationaal Cyber Security Centrum", "namespace": "https://www.ncsc.nl/" }, "references": [ { "category": "external", "summary": "Reference", "url": "https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/" }, { "category": "external", "summary": "Reference", "url": "https://mikrotik.com/supportsec/september-2026-vulnerability/" } ], "title": "Kwetsbaarheden verholpen in MikroTik RouterOS", "tracking": { "current_release_date": "2026-09-08T09:46:33.547159Z", "generator": { "date": "2025-08-04T16:30:00Z", "engine": { "name": "V.A.", "version": "1.3" } }, "id": "NCSC-2026-0345", "initial_release_date": "2026-09-08T09:46:33.547159Z", "revision_history": [ { "date": "2026-09-08T09:46:33.547159Z", "number": "1.0.0", "summary": "Initiele versie" } ], "status": "final", "version": "1.0.0" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-1" } } ], "category": "product_name", "name": "RouterOS" } ], "category": "vendor", "name": "MikroTik" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-67276", "cwe": { "id": "CWE-347", "name": "Improper Verification of Cryptographic Signature" }, "notes": [ { "category": "other", "text": "Improper Verification of Cryptographic Signature", "title": "CWE-347" }, { "category": "description", "text": "RouterOS 7.x contained a critical SSH authentication vulnerability where only the RSA key type and modulus were verified, ignoring the exponent, enabling signature forgery and unauthorized access, fixed in versions 7.23.4 and 7.24.2.", "title": "Summary" }, { "category": "general", "text": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "title": "CVSSV4" } ], "product_status": { "known_affected": [ "CSAFPID-1" ] }, "references": [ { "category": "self", "summary": "CVE-2026-67276 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-67276.json" } ], "title": "CVE-2026-67276" }, { "cve": "CVE-2026-86060", "cwe": { "id": "CWE-88", "name": "Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')" }, "notes": [ { "category": "other", "text": "Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')", "title": "CWE-88" }, { "category": "description", "text": "RouterOS versions 6.49.21, 7.23.4, and 7.24.2 fixed a vulnerability in the SSH login process where usernames starting with a prohibited character could manipulate the trusted policy mask to escalate privileges.", "title": "Summary" }, { "category": "general", "text": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "title": "CVSSV4" } ], "product_status": { "known_affected": [ "CSAFPID-1" ] }, "references": [ { "category": "self", "summary": "CVE-2026-86060 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-86060.json" } ], "title": "CVE-2026-86060" }, { "cve": "CVE-2026-67277", "cwe": { "id": "CWE-306", "name": "Missing Authentication for Critical Function" }, "notes": [ { "category": "other", "text": "Missing Authentication for Critical Function", "title": "CWE-306" }, { "category": "description", "text": "RouterOS versions 6.49.21, 7.23.4, and 7.24.2 fixed a vulnerability where unauthenticated clients could trigger an IPv4 UDP test causing kernel restarts due to improper packet handling.", "title": "Summary" }, { "category": "general", "text": "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", "title": "CVSSV4" } ], "product_status": { "known_affected": [ "CSAFPID-1" ] }, "references": [ { "category": "self", "summary": "CVE-2026-67277 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-67277.json" } ], "title": "CVE-2026-67277" } ] }