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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →CVE-2026-67278 affects RouterOS 7 and can make a router accept forged TLS certificates or SSH host keys under specific attack conditions. The listed CVSS v4 base score is 6.3 (Medium), but the score is only one part of the risk assessment: the flaw concerns how the router decides which remote servers to trust. MikroTik says the complete fixes are RouterOS 7.24.3 (stable), 7.23.6 (long-term), or later; releases 7.24.2 and 7.23.4 did not fully fix this issue.
What CVE-2026-67278 does
The vulnerability is an improper cryptographic-signature verification flaw in MikroTik RouterOS. The advisory describes malformed RSA/PKCS#1 v1.5 signatures being accepted during X.509 certificate validation. MikroTik also describes the issue as allowing forged SSH host keys and server impersonation.
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In the detailed TLS scenario, RouterOS has an e=3 root certificate in its trust store. An attacker who can control or redirect an outbound TLS connection from the router may use the root certificate’s public information—without possessing its private key—to forge a trusted intermediate certificate and issue certificates for arbitrary hostnames. If validation accepts the forged identity, the attacker may impersonate the server to the router. This is not an unconditional remote takeover: the attacker must be able to affect the relevant connection, and the router must make a trust decision over that path. GitHub Advisory Database; MikroTik security advisory
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Why a Medium score deserves context
The GitHub Advisory Database lists a CVSS v4 base score of 6.3, rated Medium. Its vector records a network attack vector, low attack complexity, present attack requirements, no privileges required, no user interaction, low confidentiality and integrity impacts to the vulnerable system, and no availability impact. Those metrics describe the advisory’s modeled base conditions; they do not quantify how much a particular router’s operations depend on remote-server trust.
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Certificates and SSH host keys help a client distinguish an intended server from an impostor. If an attacker meets the connection-control condition, a validation failure can undermine that identity check. The practical consequence depends on which outbound connections the router makes and what credentials, configuration tasks, or other operations rely on those connections. The cited sources do not quantify those consequences across installations, so neither a universal high-impact claim nor a blanket reassurance follows from the score alone.
The advisory also displayed an EPSS estimate of 0.18%, at the 8th percentile, attributed to FIRST’s Exploit Prediction Scoring System. EPSS estimates the probability of exploitation over the next 30 days; it is time-sensitive and is not a measure of impact or proof that exploitation has occurred. GitHub Advisory Database
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Check whether your RouterOS version is affected
MikroTik says RouterOS 6 is not affected by this CVE. The issue affects RouterOS 7, and the vendor’s corrected advisory says the earlier fixes in 7.24.2 and 7.23.4 were incomplete. Use the complete-fix release for your track, or a later release:
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstall| RouterOS track | Complete fix for CVE-2026-67278 |
|---|---|
| Stable | 7.24.3 or later |
| Long-term | 7.23.6 or later |
These versions reflect MikroTik’s security advisory as updated on 6 October 2026. Check the current vendor advisory and the available release for your device before updating, since firmware information can change. MikroTik security advisory; CERT Polska advisory, 5 September 2026
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- WORKS WITH YOUR EXISTING INTERNET SERVICE: Pairs with your existing modem or gateway via ethernet. Compatible with most cable, fiber, DSL, and satellite providers. Some gateways and modem router combos may require bridge mode. No coax needed.
- SET UP AND MANAGE YOUR NETWORK WITH THE NIGHTHAWK APP: Download the free Nighthawk app on iOS or Android for guided setup. Manage WiFi, run speed tests, pause devices, and set up guest networks from anywhere. Active internet required.
- WIFI 7 THAT KEEPS UP WITH A BUSY HOME: Up to 5 Gbps across 2.4 GHz and 5 GHz bands, 1.2x faster than WiFi 6. MU-MIMO and OFDMA let multiple devices send and receive data simultaneously. Real-world speeds depend on your devices and plan.
- COVERAGE IN EVERY ROOM: Delivers up to 2,250 sq. ft. of coverage for up to 80 devices. Walls, floors, and interference can reduce range. Larger or multi-story homes may benefit from a NETGEAR Orbi mesh WiFi system.
What to do if your router is on an affected release
- Confirm the RouterOS version and track. If the device runs RouterOS 7 below 7.24.3 on the stable track or below 7.23.6 on the long-term track, install the appropriate complete-fix release or later. RouterOS 6 is outside this CVE’s affected scope, according to MikroTik.
- Restrict management access. Do not expose SSH or WebFig to untrusted networks. MikroTik says its default configuration blocks these management ports from the internet. If you have opened access, limit it to trusted IP addresses or use a strong VPN such as WireGuard; avoid exposing management ports publicly.
- Check router status and configuration after updating. Review the log for a “Flagged” status and follow MikroTik’s linked instructions if one appears. Also look for unfamiliar scripts, users, or settings. A device running an affected version is not, by itself, evidence that it was compromised.
MikroTik says most configurations are not at risk and that regular home-device users face no immediate risk, while recommending that all users upgrade. That assessment is not a guarantee for every setup: access paths, outbound connections, and configuration determine exposure. MikroTik security advisory
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to judge risk beyond the CVSS label
- Software and remediation: Confirm whether the device runs RouterOS 7 and whether it has reached the complete-fix release for its track.
- Attacker’s opportunity: Consider whether an attacker could control or redirect a relevant outbound connection. The described attack requires this condition; the flaw is not an unconditional remote compromise.
- Trust-dependent activity: Identify which TLS server connections or SSH host-key checks the router performs, and what credentials or operations depend on those identity checks.
- Management exposure: Separately review whether SSH or WebFig is reachable from untrusted networks and restrict access as needed.
- Post-update indicators: Check for MikroTik’s “Flagged” status and review configuration for unfamiliar changes without assuming compromise solely from the version history.
Disclosure and scope
CERT Polska’s advisory dated 5 September 2026 identifies Sławomir Rozbicki as the researcher behind the RouterOS vulnerability research and says he participated in coordinated disclosure. CERT identifies the flaw as CWE-347, improper verification of cryptographic signature. MikroTik’s broader September 2026 report lists six CVE entries, but those entries cover separate issues with their own impacts and affected-version ranges; they should not be conflated with CVE-2026-67278. CERT Polska advisory; MikroTik security advisory
Quick Recap
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- Plug in computers, game consoles, streaming players, and more with 4 x 1 G Ethernet ports
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