For most small and medium businesses in Poland, the question of network security is often deferred until an incident occurs. According to data published by CERT Polska in their 2023 annual report, over 41,000 cybersecurity incidents were registered in Poland that year — a 48 percent increase compared to 2022. A significant portion of these involved companies with fewer than 250 employees.
The following overview covers the principal technical controls that have been documented as effective for SME environments — primarily businesses operating with one to three IT staff members or relying on an external IT provider.
Firewall Configuration
A properly configured firewall remains the foundational element of any business network defence. For SMEs, the distinction between next-generation firewalls (NGFW) and traditional packet-filtering firewalls is practically relevant: NGFWs inspect traffic at the application layer and can identify threats that bypass traditional rules.
Among the equipment categories documented in deployments by Polish IT providers, the following distinctions apply:
- Stateful packet inspection firewalls — track the state of active connections and allow only packets belonging to established sessions. Suitable as a baseline for very small businesses.
- Next-generation firewalls (Fortinet FortiGate, Sophos XG, Cisco Meraki MX) — provide application-aware filtering, SSL/TLS inspection, and intrusion prevention as a unified appliance. These are the most commonly deployed category in Polish SME environments according to VAR channel reports.
- Unified Threat Management (UTM) — combines firewall, antivirus, content filtering, and VPN in a single device. Particularly common in companies without dedicated security staff.
Regardless of device category, misconfiguration is the most frequent source of exposure. Polish CERT and the National Cybersecurity Centre (NASK) both note that default administrator credentials, open management ports exposed to the internet, and overly permissive outbound rules remain common issues in SME audits.
Network Segmentation
Flat networks — where all devices share a single subnet — significantly amplify the impact of any successful intrusion. A compromised endpoint on a flat network has unrestricted lateral movement to servers, printers, management interfaces, and other workstations.
VLAN-based segmentation separates traffic between distinct groups of devices:
- Corporate workstations
- Servers and NAS devices
- Guest Wi-Fi
- IoT and peripheral devices (printers, scanners, IP cameras)
- Management and administrative interfaces
Access Control Lists (ACLs) then define which VLANs can communicate with each other and under what conditions. For most Polish SMEs, implementing VLAN segmentation is a one-time change achievable with managed switches already present in the office, requiring only configuration updates rather than new hardware investment.
The Polish National Cybersecurity Act (Ustawa o Krajowym Systemie Cyberbezpieczeństwa, 2018) places specific obligations on operators of essential services. SMEs operating in regulated sectors — energy, finance, health, transport — should review their obligations under this framework.
VPN Access for Remote Workers
Following the widespread adoption of remote work between 2020 and 2022, VPN configurations became a critical security element for Polish businesses. However, the rush to deploy VPN solutions during the pandemic period also produced a significant number of improperly secured implementations.
Two primary VPN architectures are used in SME contexts:
IPsec-based VPNs
Traditional IPsec VPNs provide robust encryption but require client software on each endpoint. Site-to-site IPsec tunnels between branch offices remain standard in Polish multi-location SMEs. Client-to-site IPsec configurations require careful management of split tunnelling policies — routing all traffic through the VPN tunnel eliminates some attack surface but increases bandwidth consumption on the corporate connection.
SSL/TLS VPNs (OpenVPN, WireGuard)
WireGuard has gained significant adoption in Polish IT environments since 2021 due to its performance characteristics and reduced attack surface compared to older protocols. Its implementation in commercial appliances from Mikrotik, Ubiquiti, and Fortinet has made deployment accessible for SMEs. OpenVPN remains common where legacy client compatibility is required.
A documented risk vector in VPN deployments is credential reuse: employees using the same password for VPN access as for their email account. Multi-factor authentication (MFA) on VPN endpoints is a control that Polish security firms routinely include in basic SME hardening packages.
Intrusion Detection and Monitoring
Intrusion Detection Systems (IDS) and Intrusion Prevention Systems (IPS) operate by analysing traffic patterns and comparing them against known attack signatures or behavioural baselines.
For SMEs in Poland, the practical deployment path typically follows one of three approaches:
- NGFW with integrated IPS — signature-based detection managed within the existing firewall appliance. Lowest operational complexity; requires active subscription for up-to-date signatures.
- Network-based IDS (Suricata, Snort) — open-source sensors deployed on a dedicated machine or virtual machine. Requires internal expertise but offers granular control over detection rules.
- Security Information and Event Management (SIEM) — centralised log aggregation and correlation. Typically relevant for SMEs above 50 employees or operating in regulated sectors. Cloud-hosted SIEM options (Microsoft Sentinel, Elastic SIEM) have reduced the implementation threshold for smaller businesses.
Log retention is a specific requirement under Polish data protection obligations. UODO enforcement decisions have referenced the absence of access logs as a contributing factor in cases where breach notification obligations applied.
DNS Filtering
DNS-layer filtering blocks connections to known malicious domains before any TCP/IP connection is established. Services such as Cloudflare Gateway, Cisco Umbrella, or the free-tier Quad9 resolver (9.9.9.9) can be configured at the router level within minutes, requiring no endpoint agents.
Polish cybersecurity firm Securitum and CERT Polska have both published case studies where DNS filtering was the only control that blocked ransomware command-and-control communication in environments that lacked endpoint detection products.
Patch Management
Unpatched software remains the most commonly exploited attack vector in SME intrusions documented by Polish incident responders. The operational challenge is the absence of a centralised patch management system in most small businesses.
Minimum effective controls for environments without dedicated IT staff include automatic update policies enforced through Windows Group Policy or a Mobile Device Management (MDM) solution, combined with monthly verification that updates have been applied. Network appliance firmware updates — particularly for firewall and VPN concentrators — require manual processes and are frequently neglected.
External sources for current vulnerability intelligence relevant to SME environments include the CERT Polska advisory feed and the CISA Known Exploited Vulnerabilities Catalog.