Critical

HollowByte DDoS flaw bloats OpenSSL server memory with 11-byte payload

BleepingComputer

July 17, 2026 at 5:56 PM

Actively Exploited

Overview

A newly discovered vulnerability known as HollowByte poses a significant risk to OpenSSL servers by allowing unauthenticated attackers to create a denial-of-service (DoS) condition with a payload as small as 11 bytes. This flaw can lead to excessive memory consumption on affected servers, potentially causing them to crash or become unresponsive. The issue affects various OpenSSL implementations, which are widely used for secure communications on the internet. As the vulnerability is easy to exploit, it raises concerns for organizations relying on OpenSSL for their security infrastructure. Companies using OpenSSL should prioritize patching and implementing security measures to mitigate the risks associated with this vulnerability.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: OpenSSL servers
Action Required: Update to the latest OpenSSL version that addresses the HollowByte vulnerability.
Timeline: Newly disclosed

Original Article Summary

A vulnerability dubbed HollowByte allows unauthenticated attackers to trigger a denial-of-service (DoS) condition on OpenSSL servers with a malicious payload of just 11 bytes. [...]

Impact

OpenSSL servers

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Update to the latest OpenSSL version that addresses the HollowByte vulnerability. Monitor for patches from your software vendors that include OpenSSL updates.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Exploit, Vulnerability, DDoS.

Read Original Article

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