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The Fastly Next-Gen WAF (powered by Signal Sciences) Logo

The Fastly Next-Gen WAF (powered by Signal Sciences) pros and cons

Vendor: Fastly
3.8 out of 5

Pros & Cons summary

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Prominent pros & cons

PROS

Signal Sciences allows for easy configuration of web application firewall rules.
The ability to integrate and tag intermittent traffic based on patterns is a valuable feature.
It provides generated signals in a dashboard to help decide whether to allow or deny traffic.
Being API-driven, The Fastly Next-Gen WAF enables integrations with the CI/CD pipeline.
Integration with GitHub Actions simplifies the process of integrating.

CONS

Signal Sciences cannot capture some of the malicious traffic even with custom rules.
The effectiveness of rules in Signal Sciences needs improvement, as many did not function optimally.
Custom rule-writing is required to address bypasses for WAF.
Fastly does not support caching for China users, unlike Akamai.
 

The Fastly Next-Gen WAF (powered by Signal Sciences) Pros review quotes

reviewer2161107 - PeerSpot reviewer
Staff Engineer at a retailer with 1,001-5,000 employees
Aug 1, 2025
Because The Fastly Next-Gen WAF (powered by Signal Sciences) is API-driven, we have integrations with the CI/CD pipeline through GitHub Actions, making it easy to integrate.
reviewer2161107 - PeerSpot reviewer
Staff Engineer at a retailer with 1,001-5,000 employees
May 6, 2024
Fastly (Signal Sciences) integrates and tags the intermittent traffic based on patterns. It generates signals and provides them in a dashboard where we can view them and decide whether to allow or deny traffic. It's a more advanced and easy-to-navigate dashboard.
Shashank N - PeerSpot reviewer
Security Engineer Dev Sec Ops at a outsourcing company with 1,001-5,000 employees
Jan 5, 2024
The product's most valuable feature is its ability to set up the rules easily.
Learn what your peers think about The Fastly Next-Gen WAF (powered by Signal Sciences). Get advice and tips from experienced pros sharing their opinions. Updated: April 2026.
893,311 professionals have used our research since 2012.
Archana Heeralal - PeerSpot reviewer
Security Engineer at Amazon
Jun 27, 2023
When configuring a web application firewall using Signal Sciences, we configure a rule whereby no one except a few people can access the application.
 

The Fastly Next-Gen WAF (powered by Signal Sciences) Cons review quotes

reviewer2161107 - PeerSpot reviewer
Staff Engineer at a retailer with 1,001-5,000 employees
Aug 1, 2025
The UI is not very intuitive and could be better.
reviewer2161107 - PeerSpot reviewer
Staff Engineer at a retailer with 1,001-5,000 employees
May 6, 2024
Fastly don't support caching for China users. That's the only feature lacking compared to Akamai.
Shashank N - PeerSpot reviewer
Security Engineer Dev Sec Ops at a outsourcing company with 1,001-5,000 employees
Jan 5, 2024
The areas that could be improved in Signal Sciences include the effectiveness of rules, as many didn't function optimally and required custom rule-writing to address bypasses for WAF.
Learn what your peers think about The Fastly Next-Gen WAF (powered by Signal Sciences). Get advice and tips from experienced pros sharing their opinions. Updated: April 2026.
893,311 professionals have used our research since 2012.
Archana Heeralal - PeerSpot reviewer
Security Engineer at Amazon
Jun 27, 2023
Even if we create some custom rules, Signal Sciences cannot capture some of the malicious traffic.