Agent, Scan or Beyond: Modern Methods for Comprehensive Infrastructure Vulnerability Scanning
The eighth part of the practical series Vulnerability Management for Beginners examines how infrastructure scanning has evolved beyond three traditional methods. Modern environments with short-lived cloud instances, remote developer laptops, and industrial controllers require a broader toolkit that includes agent-based collection, cloud snapshots, passive traffic analysis, SCA, SBOM, and DAST.
Host Discovery, Pentest, and Audit
Host Discovery uses ICMP, UDP, ARP, and TCP ping techniques to identify live nodes and open ports without deep accuracy. It must be combined with ARP tables, hypervisor data, SIEM, EDR, and CMDB to reduce blind spots. Pentest (black-box) scanning reveals services and exploitable vulnerabilities from an attacker’s perspective through banner grabbing and safe exploitation checks. Audit (white-box) connects via WMI, RPC, or SSH with privileged credentials to obtain precise OS versions, patches, and installed software.
Agent-Based Scanning
When network reachability or privileged accounts are unavailable, lightweight agents collect local inventory and report on schedule or connectivity. Tenable and Qualys explicitly state in their documentation that agents must be paired with network scanning. Agents cannot discover unknown assets, run on network devices or OT controllers, and introduce privileged code that itself becomes an attack surface.
Cloud Snapshot and Passive Methods
Orca Security’s SideScanning and Wiz pioneered read-only disk snapshot analysis in public clouds, now also offered by Amazon for EC2 and Microsoft Defender for Cloud. The technique mounts volume copies outside the running workload. In OT and legacy segments, passive sensors on SPAN/TAP ports analyze industrial protocols without sending packets, though they miss silent devices.
Containers, SCA, and Integrations
Container images should be scanned in registries with Trivy, Grype, PT Container Security, Kaspersky Container Security, and Luntry before admission to clusters. SCA and SBOM tools address transitive dependency vulnerabilities invisible to network or agent scanners. Connectors to existing EDR, SIEM, and CMDB systems further enrich asset data.
The article concludes that organizations typically combine all approaches rather than choosing one, with coverage metrics tracked continuously to avoid false confidence in unmonitored assets.
Related articles
Fuzzy Logic in Cybersecurity: Reducing Vulnerability Queue by 7.5 Times with CVSS, EPSS and FSTEC Comparison
An information security specialist has developed a fuzzy logic system that prioritizes vulnerabilities far more effectively than traditional scoring methods. The approach uses linguistic variables and membership functions to handle the inherent uncertainty in exploitability and impact assessments. By integrating EPSS probability data with CVSS impact scores and vulnerability age, the model reduces the actionable backlog by a factor of 7.5. The implementation relies on the Mamdani inference algorithm and trapezoidal membership functions to produce smooth, human-interpretable urgency ratings. Detailed coverage checks and rule-base validation ensure no gaps exist in the decision space. Real-world testing on CVE-2025-49113 in Roundcube Webmail demonstrated practical advantages over rigid threshold logic. The method is positioned as a practical enhancement rather than a replacement for existing standards.
VLC Media Player Hit by Two Memory Corruption Flaws Exploitable via Malicious PNG and Rogue RealRTSP Server
Two vulnerabilities have been discovered in the VLC media player that allow out-of-bounds memory access. The issues affect versions from 3.0.0 through 3.0.23. CVE-2026-56711, rated 8.6 on CVSS 4.0, stems from an integer overflow when calculating image buffer sizes in PNG files, enabling attackers to trigger writes beyond allocated memory simply by opening a crafted image or loading it from a playlist. CVE-2026-73324, scored 6.9, resides in the RealRTSP module and permits a malicious server to send an oversized response string that causes reads past the end of a buffer due to a missing null terminator. Both flaws are present in official VideoLAN builds, although some distributions may exclude the RealRTSP component. No special configuration or plugins are required to trigger the issues. Until patched releases appear, users are advised to avoid opening images or playlists from untrusted sources and to refrain from connecting to unknown RealRTSP streams.
September Windows 11 Security Update KB5124008 Breaks Always On VPN Certificate Authentication
The September security update KB5124008 for Windows 11 has introduced a regression that disables Always On VPN connections using certificate-based authentication. The issue affects devices running Windows 11 versions 24H2 and 25H2 that connect to Remote Routing and Access Service (RRAS) and Network Policy Server (NPS) instances on Windows Server 2019. VPN profiles deployed via Microsoft Intune are impacted, with the failure occurring during the certificate negotiation phase of the IPsec connection. Users confirm the problem is reproducible: the VPN works before the patch, stops after installation, and resumes after patch removal and reboot. Microsoft has not yet acknowledged the regression or released a fix, leaving administrators to pause deployment through WSUS or Intune and open support cases with client and NPS logs. A potential workaround involves switching profiles to EAP-TLS, though its reliability remains unconfirmed.
API Token Lifecycle: From Issuance to Revocation and Secure Management
The article provides a comprehensive examination of the full API token lifecycle in browser-based applications, emphasizing that signatures alone cannot prevent token theft. It details risks introduced at issuance, storage, transmission, and revocation stages, including improper OAuth grant types and long-lived tokens. Key recommendations include short-lived access tokens, atomic refresh token rotation, and the use of Authorization Code Flow with PKCE for public clients. Storage advice strongly discourages localStorage and sessionStorage in favor of HttpOnly cookies or a Backend-for-Frontend pattern that keeps real tokens on the server. The piece also covers CSRF protections, rate limiting on authorization endpoints, and the advantages of signed client assertions over static secrets. Overall, it stresses that token security depends on the entire lifecycle architecture rather than cryptographic strength alone.