Overview
Zscaler Internet Access (ZIA) is a cloud-native Security Service Edge platform that includes WAF functionality as part of a broader zero trust security stack. Rather than being a standalone WAF, the WAF capabilities are integrated into Zscaler's inline inspection of all web traffic.
ZIA sits between users and the internet, inspecting 100% of traffic including encrypted SSL/TLS connections. The WAF component protects against OWASP Top 10 threats, while the broader platform adds secure web gateway, cloud firewall, DLP, CASB, and sandboxing capabilities.
Zscaler operates over 150 data centers globally, processing traffic at the edge with minimal latency. The platform is managed through a centralized console with global policy enforcement, making it attractive to large enterprises with distributed workforces.
As a publicly traded company (NASDAQ: ZS) with $2B+ annual revenue, Zscaler is one of the largest pure-play cloud security vendors. The WAF is not sold separately but as part of the ZIA platform.
Ratings Breakdown
Key Features
Inline WAF Protection
Inspects web traffic inline for OWASP Top 10 threats as part of the broader ZIA security stack.
Full SSL/TLS Inspection
Decrypts, inspects, and re-encrypts all encrypted traffic at cloud scale without performance degradation.
AI-Powered Threat Detection
Machine learning models analyze traffic patterns to detect zero-day threats and advanced attacks.
Cloud Firewall
Stateful inspection firewall for all ports and protocols, extending protection beyond HTTP/S traffic.
Centralized Policy Management
Single console for global security policy enforcement across 150+ data centers.
Zero Trust Architecture
Identity-based access control ensuring users only reach authorized applications regardless of location.
Pros & Cons
Pros
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Comprehensive security platform
WAF is part of a full zero trust stack including SWG, CASB, DLP, and cloud firewall. One vendor for everything.
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Massive scale
150+ data centers, $2B+ revenue company. Not going anywhere. Enterprise-grade reliability.
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Full SSL inspection
Inspects 100% of encrypted traffic at cloud scale, which many standalone WAFs struggle with.
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Strong compliance coverage
FedRAMP, HIPAA, SOC 2, ISO 27001, PCI DSS. Covers most enterprise compliance requirements.
Cons
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WAF is not standalone
Cannot buy WAF separately. Must adopt the full ZIA platform, which is a significant commitment.
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Enterprise pricing
Per-user pricing for the full platform means this is expensive for small and mid-size organizations.
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Complexity
Full platform deployment requires significant planning, network changes, and user agent rollout.
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Not a traditional WAF
Focuses on outbound traffic inspection (user to internet). Not a reverse proxy WAF for protecting your own web apps.
Pricing
Pricing model: Per user / Annual subscription
ZIA Business
Core secure web gateway with WAF capabilities
- Cloud WAF
- SSL/TLS inspection
- URL filtering
- Cloud firewall
- Standard threat protection
ZIA Transformation
Full security stack with advanced features
- All Business features
- Advanced threat protection
- Cloud sandboxing
- DLP
- CASB
- Browser isolation
Our Verdict
Zscaler ZIA is not a traditional WAF in the reverse-proxy sense. It is an inline security platform that inspects outbound web traffic, including WAF-like protection against web threats. If you are looking to protect your own web applications from incoming attacks, Zscaler is not the right tool.
However, for enterprises wanting to secure employee web traffic against malicious sites, exploit kits, and web-based attacks, ZIA is one of the most comprehensive platforms available. The combination of WAF, SWG, DLP, CASB, and zero trust architecture in a single cloud service is hard to match.
Our verdict: Best for large enterprises adopting zero trust security. Not a replacement for a traditional reverse-proxy WAF like Cloudflare or Imperva for protecting your own websites.
CVE Coverage
Zscaler Internet Access (ZIA) WAF can detect and block attacks matching 81K+ known CVEs based on its supported rule sets.
Coverage by Attack Type
Latest Blockable CVEs
| CVE | Severity |
|---|---|
| CVE-2026-4510 | MEDIUM |
| CVE-2026-4161 | MEDIUM |
| CVE-2026-4087 | MEDIUM |
| CVE-2026-4086 | MEDIUM |
| CVE-2026-4084 | MEDIUM |
| CVE-2026-4077 | MEDIUM |
| CVE-2026-4072 | MEDIUM |
| CVE-2026-4069 | MEDIUM |
| CVE-2026-4067 | MEDIUM |
| CVE-2026-4022 | MEDIUM |
Frequently Asked Questions
Is Zscaler a WAF?
Zscaler includes WAF capabilities as part of its Zscaler Internet Access (ZIA) platform, but it is not a traditional reverse-proxy WAF. ZIA inspects outbound user traffic to protect against web threats. For protecting your own web applications from incoming attacks, you would need a traditional WAF like Cloudflare, Imperva, or AWS WAF.
How does Zscaler pricing work?
Zscaler is priced per user on annual subscriptions. Pricing is not publicly listed and varies based on organization size, feature tier, and contract terms. Contact Zscaler sales for a quote. Expect enterprise-level pricing.
Ready to try Zscaler Internet Access (ZIA) WAF?
Visit the website to learn more or request a demo.