Tag: zero-day
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ThreatsDay Bulletin: Hybrid P2P Botnet, 13-Year-Old Apache RCE and 18 More Stories
Thursday. Another week, another batch of things that probably should’ve been caught sooner but weren’t.This one’s got some range, old vulnerabilities getting new life, a few “why was that even possible” moments, attackers leaning on platforms and tools you’d normally trust without thinking twice. Quiet escalations more than loud zero-days, but the kind that matter…
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Acrobat Reader zero-day exploited in the wild for many months
Unknown attackers have exploited a zero-day Adobe Acrobat Reader vulnerability since November 2025 and possibly even earlier, security researcher Haifei Li has discovered. PDF … First seen on helpnetsecurity.com Jump to article: www.helpnetsecurity.com/2026/04/09/acrobat-reader-zero-day-exploited/
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Acrobat Reader zero-day exploited in the wild for many months
Unknown attackers have exploited a zero-day Adobe Acrobat Reader vulnerability since November 2025 and possibly even earlier, security researcher Haifei Li has discovered. PDF … First seen on helpnetsecurity.com Jump to article: www.helpnetsecurity.com/2026/04/09/acrobat-reader-zero-day-exploited/
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Acrobat Reader zero-day exploited in the wild for many months
Unknown attackers have exploited a zero-day Adobe Acrobat Reader vulnerability since November 2025 and possibly even earlier, security researcher Haifei Li has discovered. PDF … First seen on helpnetsecurity.com Jump to article: www.helpnetsecurity.com/2026/04/09/acrobat-reader-zero-day-exploited/
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Adobe Reader Zero-Day Exploited via Malicious PDFs Since December 2025
Threat actors have been exploiting a previously unknown zero-day vulnerability in Adobe Reader using maliciously crafted PDF documents since at least December 2025.The finding, detailed by EXPMON’s Haifei Li, has been described as a highly-sophisticated PDF exploit. The artifact (“Invoice540.pdf”) first appeared on the VirusTotal platform on November 28, 2025. A second First seen on…
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PDF öffnen reicht: Zero-Day-Lücke in Adobe Reader seit Monaten unter Beschuss
Angreifer nutzen seit Ende 2025 eine Zero-Day-Lücke in Adobe Reader aus, um Daten abzugreifen und Schadcode einzuschleusen. Ein Forscher schlägt Alarm. First seen on golem.de Jump to article: www.golem.de/news/pdf-oeffnen-reicht-ungepatchte-luecke-in-adobe-reader-seit-monaten-ausgenutzt-2604-207376.html
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PDF öffnen reicht: Ungepatchte Lücke in Adobe Reader seit Monaten ausgenutzt
Angreifer nutzen seit Ende 2025 eine Zero-Day-Lücke in Adobe Reader aus, um Daten abzugreifen und Schadcode einzuschleusen. Ein Forscher schlägt Alarm. First seen on golem.de Jump to article: www.golem.de/news/pdf-oeffnen-reicht-ungepatchte-luecke-in-adobe-reader-seit-monaten-ausgenutzt-2604-207376.html
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Patch windows collapse as timeexploit accelerates
N-day exploitation: Rapid7 Labs validated its findings about a more febrile threat environment by producing both n-day and zero-day exploits using AI-assisted research, substantially reducing development time.In practice, n-day bugs, or the development of exploits against patched software, are a bigger problem than headline-grabbing zero-day vulnerabilities, adds Leeann Nicolo, incident response lead at Coalition, a technology…
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Weak at the seams
Tags: advisory, ai, attack, automation, business, cloud, compliance, control, crowdstrike, cybersecurity, data, data-breach, endpoint, exploit, finance, firewall, framework, healthcare, infrastructure, insurance, Internet, network, resilience, risk, service, supply-chain, technology, tool, update, vulnerability, windows, zero-dayThe normal choices are the dangerous ones: Consider the stack a typical large enterprise was running in 2024: One vendor for ERP and supply chain, another for perimeter enforcement, another for networking and another for endpoint protection. Standard choices, responsibly made. Within a twelve-month window, each of those categories experienced significant disruptions, from zero-day exploits…
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Weak at the seams
Tags: advisory, ai, attack, automation, business, cloud, compliance, control, crowdstrike, cybersecurity, data, data-breach, endpoint, exploit, finance, firewall, framework, healthcare, infrastructure, insurance, Internet, network, resilience, risk, service, supply-chain, technology, tool, update, vulnerability, windows, zero-dayThe normal choices are the dangerous ones: Consider the stack a typical large enterprise was running in 2024: One vendor for ERP and supply chain, another for perimeter enforcement, another for networking and another for endpoint protection. Standard choices, responsibly made. Within a twelve-month window, each of those categories experienced significant disruptions, from zero-day exploits…
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Hackers exploiting Acrobat Reader zero-day flaw since December
Attackers have been exploiting a zero-day vulnerability in Adobe Reader using maliciously crafted PDF documents since at least December. First seen on bleepingcomputer.com Jump to article: www.bleepingcomputer.com/news/security/hackers-exploiting-acrobat-reader-zero-day-flaw-since-december/
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ISMG Editors: Anthropic Bug Finder Sparks Zero-Day Dread
Also: How AI May Democratize Cybercrime and How Everyday Routers Enable Espionage. In this week’s ISMG panel, four ISMG editors discussed big shifts in cybersecurity: Anthropic’s dangerous new AI model that can uncover thousands of zero-days, growing concerns about a surge in AI-driven flaws, and the FBI disrupting a Russian espionage campaign targeting everyday routers.…
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BlueHammer: Windows zero-day exploit leaked
A buggy but functional proof-of-concept (PoC) exploit for an unpatched Windows local privilege escalation vulnerability dubbed BlueHammer has been published on GitHub by … First seen on helpnetsecurity.com Jump to article: www.helpnetsecurity.com/2026/04/08/bluehammer-windows-zero-day-exploit-leaked/
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prompted 2026 FENRIR: Al Hunting For Al Zero-Days At Scale
Author, Creator & Presenter: Peter Girnus, Senior Threat Researcher, TrendAI & Derek Chen, Vulnerability Researcher, TrendAI Our thanks to [un]prompted for publishing their Creators, Authors and Presenter’s outstanding [un]prompted 2026 AI Security Practitioner content on the Organizations’ YouTube Channel. Permalink First seen on securityboulevard.com Jump to article: securityboulevard.com/2026/04/unprompted-2026-fenrir-al-hunting-for-al-zero-days-at-scale/
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‘BlueHammer’ Exploit Targets Windows, Potentially Impacting 1 Billion+ Devices
A researcher released a working ‘BlueHammer’ Windows zero-day exploit that could impact over 1 billion devices, granting SYSTEM-level access and leaving no patch yet. The post ‘BlueHammer’ Exploit Targets Windows, Potentially Impacting 1 Billion+ Devices appeared first on TechRepublic. First seen on techrepublic.com Jump to article: www.techrepublic.com/article/news-bluehammer-windows-zero-day-exploit-microsoft/
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Anthropic Launches Claude Mythos Preview Focused on Zero-Day Vulnerability Discovery
Anthropic recently unveiled Claude Mythos Preview, a groundbreaking general-purpose language model demonstrating an unprecedented, emergent ability to autonomously discover and exploit zero-day vulnerabilities. In response to these powerful capabilities, the company introduced Project Glasswing, a coordinated defensive initiative aimed at securing critical software infrastructure before cyberattackers can leverage similar tools. This release marks a watershed…
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Hackers Target Adobe Reader Users With Sophisticated Zero-Day Exploit
Tags: adobe, attack, cyber, exploit, hacker, intelligence, remote-code-execution, threat, vulnerability, zero-daySecurity researchers at EXPMON have uncovered a highly sophisticated, unpatched zero-day vulnerability actively targeting Adobe Reader users. The exploit, first detected in the wild late last month, allows threat actors to silently steal local files, gather sensitive system information, and potentially deploy remote code execution (RCE) attacks against compromised machines. According to the threat intelligence…
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Hackers Target Adobe Reader Users With Sophisticated Zero-Day Exploit
Tags: adobe, attack, cyber, exploit, hacker, intelligence, remote-code-execution, threat, vulnerability, zero-daySecurity researchers at EXPMON have uncovered a highly sophisticated, unpatched zero-day vulnerability actively targeting Adobe Reader users. The exploit, first detected in the wild late last month, allows threat actors to silently steal local files, gather sensitive system information, and potentially deploy remote code execution (RCE) attacks against compromised machines. According to the threat intelligence…
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The zero-day timeline just collapsed. Here’s what security leaders do next
Tags: access, ai, api, attack, authentication, breach, cio, ciso, control, cyber, cybersecurity, data, data-breach, defense, endpoint, exploit, google, Internet, Intruder, leak, least-privilege, open-source, penetration-testing, resilience, service, strategy, tactics, update, vulnerability, zero-dayScaling vulnerability discovery to machine speed: Agentic AI is AI that can act, not just advise. Give it an objective, and it will plan steps, run them, learn from what happens and adjust until it succeeds or hits a hard stop. In cybersecurity, that looks like an automated operator. It can probe an application, test…
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Anthropic’s Claude Mythos Finds Thousands of Zero-Day Flaws Across Major Systems
Artificial Intelligence (AI) company Anthropic announced a new cybersecurity initiative called Project Glasswing that will use a preview version of its new frontier model, Claude Mythos, to find and address security vulnerabilities.The model will be used by a small set of organizations, including Amazon Web Services, Apple, Broadcom, Cisco, CrowdStrike,& First seen on thehackernews.com Jump…
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Anthropic’s new AI model finds and exploits zero-days across every major OS and browser
Automated vulnerability discovery tools have existed for decades, and the gap between finding a bug and building a working exploit has always slowed attackers. That gap is now … First seen on helpnetsecurity.com Jump to article: www.helpnetsecurity.com/2026/04/08/anthropic-claude-mythos-preview-identify-vulnerabilities/
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Anthropic: All your zero-days are belong to Mythos
Hasn’t released it to the public, because it would break the internet – in a bad way First seen on theregister.com Jump to article: www.theregister.com/2026/04/07/anthropic_all_your_zerodays_are_belong_to_us/
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Fortinet releases emergency hotfix for FortiClient EMS zero-day flaw
Mitigation and response: In addition to the hotfix, organizations should review their available logs for any suspicious API requests and activity. Unfortunately, there are no published indicators of compromise for this malicious activity yet, so watchTowr recommends auditing all recent changes made to endpoint security policies, VPN configuration profiles, application firewall rules, administrator accounts and…
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Storm-1175 Deploys Medusa Ransomware at ‘High Velocity’
Microsoft says the financially motivated cybercrime group has exploited N-day and zero-day vulnerabilities in campaigns predicated on speed. First seen on darkreading.com Jump to article: www.darkreading.com/threat-intelligence/storm-1175-medusa-ransomware-high-velocity
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Supply chain security is now a board-level issue: Here’s what CSOs need to know
Tags: access, android, attack, automation, best-practice, compliance, cybersecurity, edr, encryption, firewall, firmware, flaw, infrastructure, linux, mitigation, regulation, risk, sbom, software, supply-chain, switch, threat, tool, update, vulnerability, windows, zero-dayThe hidden complexity that drowns security teams: SBOMs are no longer used solely to track software licensing; they are key to managing supply chain security as they enable the identification and tracking of vulnerabilities across ecosystems.Finding a problem is just the start, you need to determine if the vulnerability affects your implementation. For example, if…
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Fortinet Releases Emergency Patch After FortiClient EMS Bug Is Exploited
Fortinet has updated its FortiClient EMS product after zero-day attacks surfaced First seen on infosecurity-magazine.com Jump to article: www.infosecurity-magazine.com/news/fortinet-emergency-patch-ems-bug/
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Experts published unpatched Windows zero-day BlueHammer
A researcher leaked the unpatched Windows zero-day “BlueHammer,” letting attackers gain SYSTEM rights; no patch exists yet. A disgruntled researcher released the BlueHammer Windows zero-day, a privilege escalation flaw that allows attackers to gain SYSTEM or admin rights, Bleeping Computer reports. The researcher privately reported the vulnerability to Microsoft but criticized the waythe Microsoft’s Security…
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China-Linked Storm-1175 Exploits Zero-Days to Rapidly Deploy Medusa Ransomware
A China-based threat actor known for deploying Medusa ransomware has been linked to the weaponization of a combination of zero-day and N-day vulnerabilities to orchestrate “high-velocity” attacks and break into susceptible internet-facing systems.”The threat actor’s high operational tempo and proficiency in identifying exposed perimeter assets have proven successful, with recent First seen on thehackernews.com Jump…
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Zoff mit Microsoft: Frustrierter Forscher leakt Zero-Day-Exploit für Windows
Ein Forscher fühlt sich offenbar von Microsoft nicht ernst genommen. Aus Frust hat er einen Exploit-Code für eine ungepatchte Windows-Lücke geleakt. First seen on golem.de Jump to article: www.golem.de/news/zoff-mit-microsoft-frustrierter-forscher-leakt-zero-day-exploit-fuer-windows-2604-207270.html
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Windows Defender 0-Day Published Online, Giving Attackers Potential Full Access
A newly discovered zero-day vulnerability, dubbed >>BlueHammer,<< has been publicly disclosed. The flaw, which has been linked to Windows Defender, allows attackers to achieve Local Privilege Escalation (LPE) and potentially gain full administrative access to compromised systems. Because a patch is not yet available from Microsoft, this public release leaves Windows users temporarily exposed to…