CVE Details
CVE-2026-67277
MikroTik RouterOS Missing Authentication for Critical Function Vulnerability
Published: 2026-09-10
CVSS: 8.8 HIGH
Product: MikroTik RouterOS
Due Date: 2026-09-13
MikroTik RouterOS contains a missing authenticaion for critical function vulnerability which allows kernel memory disclosure and denial of service in the btest service.
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FIRST EPSS
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Timeline
CVE Stalker
KEV
MITRE
GitHub
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References
Show Raw Data
| Key | Remaining Key | Value |
|---|---|---|
| dataType | CVE_RECORD | |
| dataVersion | 5.2 | |
| cveMetadata > | cveId | CVE-2026-67277 |
| cveMetadata > | assignerOrgId | 4bb8329e-dd38-46c1-aafb-9bf32bcb93c6 |
| cveMetadata > | state | PUBLISHED |
| cveMetadata > | assignerShortName | CERT-PL |
| cveMetadata > | dateReserved | 2026-07-29T11:59:30.538Z |
| cveMetadata > | datePublished | 2026-09-05T20:00:56.614Z |
| cveMetadata > | dateUpdated | 2026-09-10T19:58:23.754Z |
| containers > | cna > providerMetadata > orgId | 4bb8329e-dd38-46c1-aafb-9bf32bcb93c6 |
| containers > | cna > providerMetadata > shortName | CERT-PL |
| containers > | cna > providerMetadata > dateUpdated | 2026-09-05T20:39:44.166Z |
| containers > | cna > title | Kernel memory disclosure and denial of service in MikroTik RouterOS btest service |
| containers > | cna > problemTypes > 0 > descriptions > 0 > lang | en |
| containers > | cna > problemTypes > 0 > descriptions > 0 > cweId | CWE-306 |
| containers > | cna > problemTypes > 0 > descriptions > 0 > description | CWE-306 Missing authentication for critical function |
| containers > | cna > problemTypes > 0 > descriptions > 0 > type | CWE |
| containers > | cna > affected > 0 > vendor | Mikrotik |
| containers > | cna > affected > 0 > product | RouterOS |
| containers > | cna > affected > 0 > versions > 0 > status | affected |
| containers > | cna > affected > 0 > versions > 0 > version | 7.24 |
| containers > | cna > affected > 0 > versions > 0 > lessThan | 7.24.2 |
| containers > | cna > affected > 0 > versions > 0 > versionType | custom |
| containers > | cna > affected > 0 > versions > 1 > status | affected |
| containers > | cna > affected > 0 > versions > 1 > version | 7.0.0 |
| containers > | cna > affected > 0 > versions > 1 > lessThan | 7.23.4 |
| containers > | cna > affected > 0 > versions > 1 > versionType | custom |
| containers > | cna > affected > 0 > versions > 2 > status | affected |
| containers > | cna > affected > 0 > versions > 2 > version | 6.0.0 |
| containers > | cna > affected > 0 > versions > 2 > lessThan | 6.49.21 |
| containers > | cna > affected > 0 > versions > 2 > versionType | custom |
| containers > | cna > affected > 0 > defaultStatus | unaffected |
| containers > | cna > cpeApplicability > 0 > operator | OR |
| containers > | cna > cpeApplicability > 0 > nodes > 0 > operator | OR |
| containers > | cna > cpeApplicability > 0 > nodes > 0 > negate | False |
| containers > | cna > cpeApplicability > 0 > nodes > 0 > cpeMatch > 0 > vulnerable | True |
| containers > | cna > cpeApplicability > 0 > nodes > 0 > cpeMatch > 0 > criteria | cpe:2.3:a:mikrotik:routeros:*:*:*:*:*:*:*:* |
| containers > | cna > cpeApplicability > 0 > nodes > 0 > cpeMatch > 0 > versionStartIncluding | 0.0.0 |
| containers > | cna > cpeApplicability > 0 > nodes > 0 > cpeMatch > 0 > versionEndExcluding | 7.25.1 |
| containers > | cna > descriptions > 0 > lang | en |
| containers > | cna > descriptions > 0 > value | 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) |
| containers > | cna > descriptions > 0 > supportingMedia > 0 > type | text/html |
| containers > | cna > descriptions > 0 > supportingMedia > 0 > base64 | False |
| containers > | cna > descriptions > 0 > supportingMedia > 0 > value | <div><div>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.</div></div><div>This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)</div> |
| containers > | cna > references > 0 > url | https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve |
| containers > | cna > references > 0 > tags > 0 | third-party-advisory |
| containers > | cna > references > 1 > url | https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/ |
| containers > | cna > references > 1 > tags > 0 | technical-description |
| containers > | cna > references > 2 > url | https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/ |
| containers > | cna > references > 2 > tags > 0 | exploit |
| containers > | cna > references > 3 > url | https://mikrotik.com/supportsec/september-2026-vulnerability/ |
| containers > | cna > references > 3 > tags > 0 | vendor-advisory |
| containers > | cna > references > 4 > url | https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802 |
| containers > | cna > references > 4 > tags > 0 | release-notes |
| containers > | cna > references > 5 > url | https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801 |
| containers > | cna > references > 5 > tags > 0 | release-notes |
| containers > | cna > references > 6 > url | https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800 |
| containers > | cna > references > 6 > tags > 0 | release-notes |
| containers > | cna > metrics > 0 > format | CVSS |
| containers > | cna > metrics > 0 > scenarios > 0 > lang | en |
| containers > | cna > metrics > 0 > scenarios > 0 > value | GENERAL |
| containers > | cna > metrics > 0 > cvssV4_0 > attackVector | NETWORK |
| containers > | cna > metrics > 0 > cvssV4_0 > attackComplexity | LOW |
| containers > | cna > metrics > 0 > cvssV4_0 > attackRequirements | NONE |
| containers > | cna > metrics > 0 > cvssV4_0 > privilegesRequired | NONE |
| containers > | cna > metrics > 0 > cvssV4_0 > userInteraction | NONE |
| containers > | cna > metrics > 0 > cvssV4_0 > vulnConfidentialityImpact | LOW |
| containers > | cna > metrics > 0 > cvssV4_0 > subConfidentialityImpact | NONE |
| containers > | cna > metrics > 0 > cvssV4_0 > vulnIntegrityImpact | NONE |
| containers > | cna > metrics > 0 > cvssV4_0 > subIntegrityImpact | NONE |
| containers > | cna > metrics > 0 > cvssV4_0 > vulnAvailabilityImpact | HIGH |
| containers > | cna > metrics > 0 > cvssV4_0 > subAvailabilityImpact | NONE |
| containers > | cna > metrics > 0 > cvssV4_0 > exploitMaturity | NOT_DEFINED |
| containers > | cna > metrics > 0 > cvssV4_0 > Safety | NOT_DEFINED |
| containers > | cna > metrics > 0 > cvssV4_0 > Automatable | NOT_DEFINED |
| containers > | cna > metrics > 0 > cvssV4_0 > Recovery | NOT_DEFINED |
| containers > | cna > metrics > 0 > cvssV4_0 > valueDensity | NOT_DEFINED |
| containers > | cna > metrics > 0 > cvssV4_0 > vulnerabilityResponseEffort | NOT_DEFINED |
| containers > | cna > metrics > 0 > cvssV4_0 > providerUrgency | NOT_DEFINED |
| containers > | cna > metrics > 0 > cvssV4_0 > version | 4.0 |
| containers > | cna > metrics > 0 > cvssV4_0 > baseSeverity | HIGH |
| containers > | cna > metrics > 0 > cvssV4_0 > baseScore | 8.8 |
| containers > | cna > metrics > 0 > cvssV4_0 > vectorString | 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 |
| containers > | cna > credits > 0 > lang | en |
| containers > | cna > credits > 0 > value | Sławomir Rozbicki (CERT.PL) |
| containers > | cna > credits > 0 > type | finder |
| containers > | cna > source > discovery | INTERNAL |
| containers > | cna > x_generator > engine | Vulnogram 1.0.3 |
| containers > | adp > 0 > metrics > 0 > other > type | ssvc |
| containers > | adp > 0 > metrics > 0 > other > content > id | CVE-2026-67277 |
| containers > | adp > 0 > metrics > 0 > other > content > role | CISA Coordinator |
| containers > | adp > 0 > metrics > 0 > other > content > options > 0 > Exploitation | active |
| containers > | adp > 0 > metrics > 0 > other > content > options > 1 > Automatable | yes |
| containers > | adp > 0 > metrics > 0 > other > content > options > 2 > Technical Impact | partial |
| containers > | adp > 0 > metrics > 0 > other > content > version | 2.0.3 |
| containers > | adp > 0 > metrics > 0 > other > content > timestamp | 2026-09-10T19:48:06.780837Z |
| containers > | adp > 0 > metrics > 1 > other > type | kev |
| containers > | adp > 0 > metrics > 1 > other > content > dateAdded | 2026-09-10 |
| containers > | adp > 0 > metrics > 1 > other > content > reference | https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67277 |
| containers > | adp > 0 > references > 0 > url | https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67277 |
| containers > | adp > 0 > references > 0 > tags > 0 | government-resource |
| containers > | adp > 0 > title | CISA ADP Vulnrichment |
| containers > | adp > 0 > providerMetadata > orgId | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
| containers > | adp > 0 > providerMetadata > shortName | CISA-ADP |
| containers > | adp > 0 > providerMetadata > dateUpdated | 2026-09-10T19:58:23.754Z |
| containers > | adp > 0 > timeline > 0 > time | 2026-09-10T00:00:00.000Z |
| containers > | adp > 0 > timeline > 0 > lang | en |
| containers > | adp > 0 > timeline > 0 > value | CVE-2026-67277 added to CISA KEV |