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Heartbleed Check Added To ZULU

ID: 1d948d75-92dd-5b10-ac82-543260fb8bac

STIX ID: report--1d948d75-92dd-5b10-ac82-543260fb8bac

Feed Name: Zscaler Security Research Blog

Threat Score
70/100

Date Published: 2025-04-02

Date Updated: 2026-05-01

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The ZULU URL-analysis service has added a Heartbleed OpenSSL check; the blog explains how the TLS heartbeat extension vulnerability allows attackers to read server memory (potentially exposing passwords, cookies and private keys), notes the widespread exposure of popular sites, and describes how ZULU tests servers by sending malformed heartbeat requests to detect vulnerability.

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