CBSE portal repels massive DoS attack of 3.8 million packets; over 70,000 grievance applications received
3 min readNew DelhiUpdated: Jun 5, 2026 05:08 PM IST
The Central Board of Secondary Education (CBSE) said its post-result grievance redressal portal successfully withstood a major Denial-of-Service (DoS) attack involving nearly 3.8 million malicious packets on June 3, 2026, with technical teams intervening in time to keep the platform protected and fully operational.
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In a statement issued to ANI, CBSE said that as of June 4, a total of 70,433 successful applications had been received through the grievance redressal process — 7,314 applications for verification of marks and 63,119 for re-evaluation — underscoring the scale of student demand for review of Class 12 results amid the ongoing marking controversy.
CBSE says, “As of 4 June 2026, a total of 70,433 successful applications have been received through the CBSE post-result grievance redressal process, including 7,314 applications for Verification of Marks and 63,119 applications for re-evaluation. Despite a malicious…
— ANI (@ANI) June 5, 2026
“Despite a malicious Denial-of-Service (DoS) attack involving nearly 3.8 million packets on 3 June 2026, the portal remained protected and operational due to timely intervention by technical teams,” the board said.
The disclosure sheds new light on the security infrastructure underpinning the portal, which has been at the centre of intense scrutiny following reports of payment gateway vulnerabilities and system disruptions in recent days.
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According to CBSE, the portal did not go live until an extensive pre-launch security audit had been completed. “Prior to launch, the CBSE verification and re-evaluation portal underwent an emergency security hardening and validation exercise, including penetration testing, vulnerability assessment, and load/stress testing with specialised cybersecurity support,” the board said.
The system was further reinforced with Web Application Firewall (WAF) protection, DDoS mitigation tools, secure authentication controls, audit logging and continuous monitoring before it was activated at approximately 4:30 am on June 2, 2026 — only after all security checks had been cleared.
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The precautions proved prescient. Within just two minutes of the portal going live, it recorded approximately 1.5 million access requests. Alongside this surge, the system detected and blocked over 1,00,000 unauthorised access attempts. “The traffic profile showed coordinated high-volume request bursts consistent with DDoS-type patterns, which were successfully mitigated by the deployed security architecture,” CBSE said.
The board’s statement comes against the backdrop of a turbulent few weeks for its digital infrastructure. The revaluation portal had earlier faced criticism after a payment gateway hack — linked to the HDFC payment system — caused erratic fee displays for around 50 students, with amounts fluctuating between Re 1 and nearly Rs 68,000.
Following that incident, the government had roped in cybersecurity experts from IIT Madras and IIT Kanpur, integrated four public sector banks as additional payment gateways, and migrated the system to Amazon Web Services.