CVE-2026-93345Network attack vector

BGP service crash via malformed labelled-VPN NLRI

Published Sep 22, 2026 · Updated Sep 22, 2026

Improper input validation in MikroTik RouterOS before 7.25beta4 allows man-in-the-middle attackers to crash BGP with a malformed UPDATE. The labelled-VPN NLRI iterators accept a prefix length below the VPNv4 or VPNv6 minimum and derive a negative-length address portion from it. An attacker positioned on an established BGP path can repeatedly send one crafted UPDATE to terminate sessions without a NOTIFICATION and keep the BGP plane unavailable.

CVSS severityUnavailable
Unscored
EPSS probability0.49%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in MikroTik RouterOS before 7.25beta4 allows man-in-the-middle attackers to crash BGP with a malformed UPDATE. The labelled-VPN NLRI iterators accept a prefix length below the VPNv4 or VPNv6 minimum and derive a negative-length address portion from it. An attacker positioned on an established BGP path can repeatedly send one crafted UPDATE to terminate sessions without a NOTIFICATION and keep the BGP plane unavailable.

The record

CVE
CVE-2026-93345
Published
Sep 22, 2026
Updated
Sep 22, 2026
Vendor
MikroTik
Product
RouterOS
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.21.5 <7.25beta4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MikroTik · RouterOSversion=7.21.5 <7.25beta4

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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