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Xavier Stevens

Xavier Stevens

Staff Security Researcher, Fastly

Xavier Stevens is a Staff Security Researcher at Fastly, with a focus on threat research, detection engineering, and product innovation.
Active exploitation of unauthenticated stored XSS vulnerabilities in WordPress PluginsFastly Security Research Team, Simran Khalsa, +2
We have observed active exploitation attempts targeting three high-severity CVEs: CVE-2024-2194, CVE-2023-6961, and CVE-2023-40000.
SecurityIndustry insights
Network Effect Threat Report: Uncovering the power of collective threat intelligenceFastly Security Research Team, Simran Khalsa, +3
Announcing the Network Effect Threat Report, Fastly’s threat intelligence report with insights based on unique data from April to June of 2023
SecurityIndustry insights+1
CVE-2023-34362: Progress MOVEit Transfer SQL Injection VulnerabilityFastly Security Research Team, Simran Khalsa, +3
What you need to know about CVE-2023-34362: Progress MOVEit Transfer SQL Injection Vulnerability
Security
What is TLS Fingerprinting?Fastly Security Research Team, Xavier Stevens
TLS fingerprinting has become a prevalent tool to help security defenders identify what clients are talking to their server infrastructure.
Security
Threat hunting network callbacks in WAF dataFastly Security Research Team, Xavier Stevens
Threat hunting is the practice of looking for active attackers who have possibly penetrated security boundaries within an organization. WAF data can be a valuable resource in threat hunting for network callbacks. Here’s how.
Security
Spring: CVE-2022-22963 & Spring4Shell (CVE-2022-22965) | FastlyFastly Security Research Team, Xavier Stevens, +1
In this post, we review details for two RCE vulnerabilities impacting Spring Cloud and Spring Framework, including how Fastly customers can protect themselves from this vulnerability.
Security
WAF framework measures WAF effectiveness | FastlyFastly Security Research Team, Simran Khalsa, +1
Our new WAF efficacy framework provides a standardized way to measure the effectiveness of a WAF’s detection capabilities through continuous verification and validation. Here’s how it works.
EngineeringSecurity
Log4Shell attacks (CVE-2021-44228) insights | FastlyFastly Security Research Team, Xavier Stevens, +1
We’re sharing our latest data and new insights into the Log4j/Log4Shell vulnerability (CVE-2021-44228 + CVE-2021-45046) in this post in order to help the engineering community cope with the situation. We also share our guidance around testing your environment against many of the new obfuscation methods that have been seen.
Industry insightsSecurity
Log4Shell exploit found in Log4j | FastlyFastly Security Research Team, Xavier Stevens, +1
CVE-2021-44228 is a Remote Code Execution vulnerability in the Apache Log4j library being actively exploited. We provide our observations into the exploit and a summary of its impact.
SecurityEngineering
Atlassian Confluence OGNL Injection Vulnerability Protection | FastlyFastly Security Research Team, Xavier Stevens, +1
Our Security Research Team has built and deployed a rule to help protect customers of our next-gen WAF against the recently announced Confluence Server OGNL injection vulnerability, CVE-2021-26084.
Security
Next-Gen WAF for Microsoft Exchange | FastlyFastly Security Research Team, Xavier Stevens, +1
Fastly’s security research team has built and deployed a rule to protect Signal Sciences Next-Gen WAF customers against the recently announced Microsoft Exchange Server vulnerabilities.
ProductSecurity