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CVE-2026-67278 affects RouterOS 7 and can let an attacker impersonate a server to a router if the attacker can control or redirect the router’s outbound connection. The advisory rates it CVSS v4 6.3, Medium; that score describes a defined set of base conditions, not every deployment’s exposure or the significance of a trust decision failing. MikroTik says the complete fix is in RouterOS 7.24.3 stable, 7.23.6 long-term, or later. RouterOS 6 is not affected by this specific CVE.
What CVE-2026-67278 does
This is a cryptographic signature-verification flaw in MikroTik RouterOS. The advisory says malformed RSA/PKCS#1 v1.5 signatures can be accepted during X.509 certificate validation. The detailed attack described in the advisory relies on an e=3 root certificate in the RouterOS trust store: an attacker who can control or redirect an outbound TLS connection can use the root’s public certificate, without possessing its private key, to forge a trusted intermediate certificate and issue certificates for arbitrary hostnames. The result can be TLS server impersonation.
MikroTik also describes the issue as allowing forged SSH host keys and server impersonation. A certificate or SSH host key is how a client checks that a remote endpoint is the intended server. If that identity check accepts a forged value under the required conditions, the router may communicate with an attacker-controlled endpoint while treating it as trusted.
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Why the Medium score does not settle the risk
The GitHub Advisory Database lists a CVSS v4 base score of 6.3 out of 10, rated Medium. Its vector records a network attack vector, low attack complexity, an attack requirement that is present, no privileges required, no user interaction, low confidentiality and integrity impacts to the vulnerable system, and no availability impact. Those metrics are useful shorthand for the base scenario; they do not quantify the importance of every trust decision in a particular deployment.
The practical question is what a router trusts and what depends on that trust. A server impersonation could matter more in a network where router connections carry sensitive credentials or support consequential operations than in one with little relevant outbound activity. The available advisories do not quantify those consequences across installations, so administrators should assess their own connections and configuration rather than infer either negligible or severe impact from the label alone.
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The same GitHub advisory 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 evidence that exploitation has occurred.
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Which RouterOS versions are affected, and which fix it?
MikroTik’s security page was updated on 6 October 2026 to clarify that earlier fixes were incomplete. The complete RouterOS 7 fix is in 7.24.3 (stable) and 7.23.6 (long-term), or any later release. RouterOS 7.24.2 and 7.23.4 do not contain the complete fix for this CVE. MikroTik says RouterOS 6 is not affected by CVE-2026-67278.
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Check MikroTik’s official security advisory for current release guidance, because the vendor’s correction changed which versions count as fixed. CERT Polska’s 5 September 2026 advisory identifies this issue as CWE-347, improper verification of cryptographic signature, and lists Sławomir Rozbicki as the researcher involved in coordinated disclosure.
What administrators should do
- Check the installed version and release track. On RouterOS 7, if the device is below 7.24.3 stable or 7.23.6 long-term in the relevant track, upgrade to the applicable complete-fix version or later. RouterOS 6 is outside the scope of this CVE, though MikroTik’s advisories may describe other issues with different version ranges.
- 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 access has been opened, limit it to trusted IP addresses or use a strong VPN such as WireGuard rather than exposing management ports broadly.
- Check the router’s status after updating. Review the log for a “Flagged” status and follow the vendor’s linked instructions if one appears. Also inspect the configuration for unfamiliar scripts, users, or settings, whether or not the router is flagged.
- Investigate based on evidence, not version alone. Running an affected release does not by itself establish that a device was compromised. Assess its exposure and configuration; the vendor guidance supports checking these, not assuming compromise automatically.
How much should typical users worry?
MikroTik says most configurations are not at risk and that regular home-device users face no immediate risk, while still recommending an upgrade for all users. That is useful context, not a guarantee for every home network: access paths and configuration matter. The practical response is to install the corrected update and ensure management interfaces are not reachable from untrusted networks.
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