HTTP/2 Bomb Remote DoS Exploit Targets Major Web Servers
Severity: High (Score: 66.0)
Sources: Gbhackers, Cybersecuritynews
Published: · Updated:
Keywords: http, bomb, remote, exploit, nginx, apache, envoy
Severity indicators: ot
Summary
The newly disclosed 'HTTP/2 Bomb' exploit poses a significant remote denial-of-service (DoS) threat to major web servers including nginx, Apache httpd, Microsoft IIS, Envoy, and Cloudflare Pingora. Discovered by security researcher Quang Luong and the Codex team, this attack can exhaust tens of gigabytes of server memory within seconds through default HTTP/2 configurations. The exploit allows a single attacker to initiate a DoS condition remotely, affecting widely deployed systems across the internet. The vulnerability underscores the urgent need for server administrators to review their HTTP/2 configurations and implement necessary mitigations. Currently, there are no specific CVEs associated with this exploit, but the potential impact is extensive given the number of affected systems. Key Points: • The HTTP/2 Bomb exploit targets default configurations of major web servers. • Affected systems include nginx, Apache, IIS, Envoy, and Cloudflare Pingora. • The exploit can exhaust server memory rapidly, leading to denial-of-service conditions.
Detailed Analysis
**Impact** The exploit affects major web servers including nginx, Apache httpd, Microsoft IIS, Envoy, and Cloudflare Pingora, all widely deployed globally across multiple sectors. It enables remote denial-of-service (DoS) conditions, allowing a single attacker to exhaust tens of gigabytes of server memory within seconds, potentially causing significant service outages and operational disruptions. No data breach or data loss has been reported in connection with this attack. **Technical Details** The attack exploits default HTTP/2 configurations to trigger a memory exhaustion condition remotely, referred to as the “HTTP/2 Bomb.” The technique was discovered by security researcher Quang Luong and the Codex team. No specific CVEs or malware tools have been disclosed, and no indicators of compromise (IOCs) are provided in the available sources. The attack occurs at the exploitation stage of the kill chain by leveraging protocol-level vulnerabilities. **Recommended Response** Administrators should prioritize reviewing and hardening HTTP/2 server configurations, particularly default settings, to mitigate memory exhaustion risks. Monitoring for unusual memory usage spikes and anomalous HTTP/2 traffic patterns is advised. No patches or specific detection signatures have been published yet; defenders should stay alert for updates from affected vendors and apply them promptly when available.
Source articles (2)
- HTTP/2 Bomb — Remote DoS Exploit Hits nginx, Apache, IIS, Envoy, and Cloudflare Pingora — Cybersecuritynews · 2026-06-03
A newly disclosed remote denial-of-service exploit dubbed “HTTP/2 Bomb” targets the default HTTP/2 configurations of the world’s most widely deployed web servers, nginx, Apache httpd, Microsoft IIS, E… - HTTP/2 Bomb Remote DoS Exploit Impacts nginx, Apache, IIS, Envoy, and Cloudflare Pingora — Gbhackers · 2026-06-03
A newly disclosed “HTTP/2 Bomb” attack is raising serious concerns across the web infrastructure ecosystem, enabling remote denial-of-service (DoS) conditions against widely deployed servers including…
Timeline
- 2026-06-03 — HTTP/2 Bomb exploit disclosed: Security researcher Quang Luong revealed the HTTP/2 Bomb exploit affecting major web servers, enabling remote DoS attacks.
- 2026-06-03 — Cybersecurity articles published: Multiple cybersecurity news outlets reported on the HTTP/2 Bomb exploit, highlighting its potential impact and affected systems.
Related entities
- DDoS (Attack Type)
- Denial of Service (Attack Type)
- T1499 - Endpoint Denial of Service (Mitre Attack)
- Apache Httpd (Platform)
- Cloudflare Pingora (Platform)
- Microsoft IIS (Platform)
- Envoy (Company)
- Nginx (Tool)