Why CVSS Scores Fail Against Chained Vulnerabilities: A 2026 Security Triage Crisis and Action Plan for Security Directors

When news broke about attackers exploiting chained vulnerabilities in Palo Alto Networks firewalls to gain root access across more than 13,000 devices during Operation Lunar Peek in November 2024, it wasn’t just another headline for cybersecurity teams in Chicago—it was a wake-up call echoing through the server rooms of financial institutions along LaSalle Street and the IT departments managing critical infrastructure near O’Hare Airport. The revelation that CVE-2024-0012 (scored 9.3 by Palo Alto under CVSS v4.0) and CVE-2024-9474 (scored 6.9) could be chained to bypass authentication and escalate privileges—despite individual scores suggesting manageable risk—struck a chord in a city where legacy systems often intertwine with modern cloud environments.

Chicago’s unique position as a global financial and transportation hub amplifies the stakes. The Chicago Mercantile Exchange, United Airlines’ headquarters, and numerous healthcare networks relying on segmented architectures all depend on the assumption that vulnerability scores reflect real-world exploitability. Yet as Adam Meyers, SVP of Counter Adversary Operations at CrowdStrike, told VentureBeat in an exclusive interview on April 22, 2026, “Adversaries circumvent [severity ratings] by chaining vulnerabilities together,” adding that the failure to see the kill chain was like “amnesia from 30 seconds before.” This mindset shift is critical for Chicago’s defenders, where a single compromised firewall could expose not just corporate data but transit systems or commodity trading platforms.

The city’s cybersecurity landscape faces additional pressure from the very trends highlighted in the analysis. With Jerry Gamblin projecting 70,135 CVEs for 2026—a 20.6% increase from 2025’s 48,185—and Meyers warning that frontier AI could drive annual volumes past 480,000, Chicago’s IT teams are already stretched thin. The NVID’s April 15 announcement prioritizing enrichment for KEV and federal critical software only means local governments and private sector defenders must shoulder more burden for vulnerability context. Here’s especially pertinent given that both CVEs involved are on CISA’s Known Exploited Vulnerabilities catalog, yet neither score flagged the dangerous combination that led to widespread compromise.

Second-order effects ripple through Chicago’s economy. Beyond immediate technical risks, the erosion of trust in CVSS scores—as described by Peter Chronis, former CISO of Paramount, who reduced critical vulnerabilities by 90% by moving beyond CVSS-first prioritization—impacts budget cycles and board reporting. When Chris Gibson, executive director of FIRST, calls using CVSS base scores alone “the least apt and accurate” method, it challenges how Chicago’s corporations justify cybersecurity investments. The shift toward solutions like EPSS and SSVC, which add exploitation probability and decision-tree logic, isn’t just technical—it’s organizational, requiring retraining and process overhauls in environments where change moves at the speed of city council approvals.

Given my background in translating complex security trends into actionable local insights, if this trend impacts you in Chicago, here are the three types of local professionals you need:

• **Cyber Risk Architects Specializing in Supply Chain Chains**: Look for consultants with verifiable experience mapping attack paths in environments with mixed legacy and cloud infrastructure—particularly those who’ve conducted chain-dependency audits on KEVs for financial or transportation sector clients. They should reference frameworks like MITRE ATT&CK and demonstrate ability to prioritize based on exploitability, not just CVSS scores.
• **Managed Detection and Response (MDR) Providers with Chicago-Based SOCs**: Prioritize teams operating 24/7 security centers within the metro area (near the Loop or emerging tech hubs like the West Loop) that integrate threat intelligence from sources like Unit 42 and Darktrace. Ask about their mean time to detect (MTTD) for chained exploits and whether they run purple team exercises simulating attacks like Operation Lunar Peek.
• **Identity and Access Management (IAM) Consultants Focused on Human and Machine Gaps**: Seek professionals who treat facilitate desk verification processes and agentic AI credential sprawl with the same rigor as software patching. They should have concrete examples of closing authentication gaps that bypassed traditional CVEs—like the social engineering call causing over $100 million in losses—and understand how to integrate identity-surface controls into vulnerability management workflows.

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