Heartbleed - Vulnerability

Threat entity extracted from intelligence sources

Frequency
7
occurrences
First Seen
December 28, 2025
Last Seen
June 23, 2026

Heartbleed is a vulnerability tracked by ThreatCluster, appearing in 5 threat clusters built from 7 intelligence report mentions.

Heartbleed is a vulnerability tracked across 5 threat clusters and 7 intelligence report mentions on ThreatCluster. First observed December 28, 2025; most recent activity June 23, 2026.

Related Threat Clusters

  • Critical Squid Proxy Vulnerability 'Squidbleed' Exposes User Data

    A memory leak vulnerability named Squidbleed, tracked as CVE-2026-47729, has been discovered in the Squid web proxy software, affecting versions since 1997. This flaw allows attackers to read beyond memory buffer…

    10 articles · Updated June 22, 2026
  • MongoBleed Vulnerability Exposes MongoDB Data to Attackers

    MongoDB has patched CVE-2025-14847, a vulnerability that affects multiple versions of MongoDB Server. The flaw allows unauthenticated attackers to remotely exploit the vulnerability with low complexity, potentially…

    2 articles · Updated January 10, 2026
  • Old Vulnerabilities Persist Amid AI Advancements

    Organizations face heightened risks from old vulnerabilities as the AI era progresses. A recent study by TrendAI™ Research highlights that cybercriminals continue to exploit long-disclosed vulnerabilities, with the…

    2 articles · Updated March 25, 2026
  • Development of Advanced Intrusion Detection Datasets for Cybersecurity

    Recent advancements in intrusion detection systems (IDS) have focused on improving dataset reliability for anomaly detection. The CSE-CIC-IDS2018 dataset has been developed to address the shortcomings of previous…

    3 articles · Updated April 12, 2026
  • Over 70,000 MongoDB Servers Exposed to MongoBleed Vulnerability

    A critical vulnerability known as MongoBleed, tracked as CVE-2025-14847, affects over 74,000 MongoDB servers globally, allowing unauthenticated attackers to extract sensitive data from server memory. The flaw, linked to…

    6 articles · Updated December 30, 2025

Recent Intelligence Reports

  • Mythos discovers 'Squidbleed,' a memory leak that's gone undetected since Clinton era — Theregister · June 23, 2026
  • 29-Year-Old ‘Squidbleed’ Vulnerability Discovered With the Aid of Claude Mythos Preview — Cybersecuritynews · June 22, 2026
  • Ids 2018 — www.unb.ca · May 31, 2026
  • Ids 2017 — www.unb.ca · April 24, 2026
  • Old Vulnerabilities, New AI Era, Amplified Risk — Trendmicro · March 25, 2026
  • MongoBleed Vulnerability Allows Attackers to Read Data From MongoDB's Heap Memory — Infoq · January 10, 2026
  • 87,000+ MongoDB Instances Vulnerable to MongoBleed Flaw Exposed Online — Cybersecuritynews · December 28, 2025

Related Entities

ARES Botnet Brute Force Data Breach DDoS Denial of Service DoS Malware Sql Injection Web Attack AWS Fortinet

Frequently asked questions

What is Heartbleed?

Heartbleed is a vulnerability tracked by ThreatCluster, appearing in 5 threat clusters built from 7 intelligence report mentions.

Is Heartbleed still active?

The most recent intelligence report mentioning Heartbleed on ThreatCluster is dated June 23, 2026. Activity was first observed December 28, 2025, giving a tracked span from then to June 23, 2026.

What is Heartbleed associated with?

Across ThreatCluster reporting, Heartbleed most frequently co-occurs with ARES, Botnet, Brute Force, Data Breach, DDoS, among 12 tracked related entities.

What are the latest developments involving Heartbleed?

The most significant recent cluster is “Critical Squid Proxy Vulnerability 'Squidbleed' Exposes User Data” (10 articles · Updated June 22, 2026). Heartbleed appears across 5 threat clusters in total, listed above with sources.

How much reporting does ThreatCluster have on Heartbleed?

Heartbleed appears in 7 intelligence report mentions across 5 deduplicated threat clusters, aggregated from 17,000+ monitored sources.

CVSS v3.1 Breakdown