CVE-2026-93345
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk39th percentile - higher than 39% of all known CVEs
Summary
MikroTik RouterOS before 7.25beta4 contains an improper input validation vulnerability in the labelled-VPN NLRI iterators of the routing service. An unauthenticated on-path attacker can send a malformed MP_REACH_NLRI UPDATE message with a prefix-length value below the minimum valid for a labelled-VPN NLRI, which passes validation while describing a route with a negative-length address portion. The fix is carried only in 7.25beta4 (a development build); the current stable release 7.24.2 and the long-term release 7.23.5 both remain affected.
Risk Assessment
An attacker can repeatedly send a single BGP UPDATE packet to indefinitely hold down the BGP plane, causing session termination without a NOTIFICATION and triggering a service malfunction on the device. This leads to routing unavailability and disruption of the organization's network operations.
Recommendation
Plan an upgrade to 7.25beta4 or later once available in the stable channel, and implement filtering and validation of BGP messages from untrusted peers. Until then, consider restricting trusted BGP sessions and monitoring for anomalies in MP_REACH_NLRI messages.
Other vulnerabilities in MikroTik RouterOS
See all- CVE-2024-27686High
Mikrotik RouterOS versions 6.40.5 through 6.49.10 (fixed in 7) allow a remote attacker to cause a device crash via crafted packet data to the SMB service on TCP port 445.
- CVE-2026-67278Critical
MikroTik RouterOS (7.x) accepts malformed RSA/PKCS#1 v1.5 signatures across RSA-based services, including TLS/X.509 certificate validation and SSH host-key authentication. Because the trust store includes an e=3 root CA, an attacker controlling or redirecting outbound TLS can use the root's public certificate to forge a trusted intermediate and issue certificates for arbitrary hostnames, enabling TLS server impersonation. This also undermines RSA-based SSH authentication.
- CVE-2018-14847CriticalActively exploited
MikroTik RouterOS through 6.42 allows unauthenticated remote attackers to read arbitrary files and remote authenticated attackers to write arbitrary files due to a directory traversal vulnerability in the WinBox interface.
- CVE-2018-7445CriticalActively exploited
A buffer overflow was found in the MikroTik RouterOS SMB service when processing NetBIOS session request messages. A remote attacker with access to the service can exploit this vulnerability to gain code execution on the system, and the overflow occurs before authentication, so an unauthenticated remote attacker can exploit it.
- CVE-2025-56566Medium
MikroTik firmware 7.19.4 stores sensitive authentication credentials and network state in cleartext within non-volatile storage. An attacker with physical access to the device can extract this material from an SPI flash dump without authenticating and without knowing the administrative password.
- CVE-2026-89028High
MikroTik RouterOS before 7.24 contains a heap memory corruption vulnerability in the userspace SMB daemon that allows remote attackers to corrupt adjacent heap memory by supplying a crafted uniPwdLen value in the SMB1 SessionSetupAndX handler. An attacker can send a malformed SMB1 request with a uniPwdLen field that triggers an integer underflow, causing the resulting value to be used as the copy length in a memory copy operation into a smaller heap buffer, corrupting adjacent heap memory.
- CVE-2026-89021Medium
MikroTik RouterOS before 7.24.2 contains a path traversal vulnerability in the container package OCI/tar image extraction. An attacker can write files outside the container root by supplying a crafted image with symlinks pointing to arbitrary paths. Via /container/add, this allows root-privileged file creation, directory creation, file deletion via overlayfs whiteout, and hardlink creation on the persistent data partition without starting the container. The 7.23.x long-term branch does not contain the fix.
- CVE-2026-89020Medium
MikroTik RouterOS before 7.23.4 (long-term) and 7.24.2 (stable) contains a stack-based buffer overflow vulnerability in the mtget binary's TFTP RRQ builder function, allowing authenticated users to crash the mtget worker process by supplying a URL path of 507 bytes or more to the /tool fetch command.
- CVE-2026-14227Medium
A product with the MikroTik RouterOS API enabled is vulnerable to insufficient session expiration. Active sessions may retain their previous permission set after inactivity timeouts or user-group changes.
- CVE-2026-16347High
MikroTik RouterOS contains a weakness in its API authentication handling that lacks effective safeguards against excessive login attempts. The system does not enforce meaningful rate-limiting, account lockout, or source-based restrictions, allowing repeated authentication failures to proceed without defensive response. In some versions, a fixed per-connection delay is present, but it can be bypassed through concurrent sessions, resulting in continued high-volume attempts.
Original NVD description (English source)
MikroTik RouterOS before 7.25beta4 contains an improper input validation vulnerability in the labelled-VPN NLRI iterators of the routing service that allows an unauthenticated on-path attacker to crash the BGP service by sending a malformed MP_REACH_NLRI UPDATE message with a prefix-length value below the minimum valid for a labelled-VPN NLRI, which passes validation while describing a route with a negative-length address portion. Attackers can repeatedly send a single BGP UPDATE packet carrying a VPNv4 or VPNv6 NLRI with an out-of-bounds prefix-length to indefinitely hold down the BGP plane, causing session termination without a NOTIFICATION and triggering a service malfunction on the device. The fix is carried only in 7.25beta4, a development build; the current stable release 7.24.2 and the current long-term release 7.23.5 both remain affected.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS