Unauthenticated UDP reconnaissance via source-port firewall rule
Published Jun 30, 2025 · Updated Jul 5, 2026
Firewall misconfiguration in MikroTik RouterOS 7 before 7.14 allows remote attackers to conduct UDP service reconnaissance via IPv6. The default IPv6 input rule matches UDP source ports 33434–33534 instead of destination ports, so an attacker-selected source port bypasses later filtering. No authentication is required; the bypass exposes enabled UDP services such as DNS, CAPsMAN, and containers to external reconnaissance.
Summary
What happened
Firewall misconfiguration in MikroTik RouterOS 7 before 7.14 allows remote attackers to conduct UDP service reconnaissance via IPv6. The default IPv6 input rule matches UDP source ports 33434–33534 instead of destination ports, so an attacker-selected source port bypasses later filtering. No authentication is required; the bypass exposes enabled UDP services such as DNS, CAPsMAN, and containers to external reconnaissance.
The record
- CVE
- CVE-2023-47310
- Published
- Jun 30, 2025
- Updated
- Jul 5, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-1174, T1046
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 30, 2025CVE publishedPublication date reported by the CVE source.
- Jul 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- IPv6 UDP source-port firewall bypass procedureproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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