Tag: dos
-
CVE-2025-7775: Citrix NetScaler ADC and NetScaler Gateway Zero-Day Remote Code Execution Vulnerability Exploited in the Wild
Citrix has released patches to address a zero-day remote code execution vulnerability in NetScaler ADC and NetScaler Gateway that has been exploited. Organizations are urged to patch immediately. Background On August 26, Citrix published a security advisory for three vulnerabilities, including CVE-2025-7775, a zero-day vulnerability which has been exploited against its NetScaler Application Delivery Controller…
-
QUIC-LEAK Vulnerability Allows Attackers to Drain Server Memory and Cause DoS
Security researchers at Imperva have disclosed a critical pre-handshake memory exhaustion vulnerability in the widely-used LSQUIC QUIC implementation that enables remote attackers to crash servers through denial-of-service attacks. The flaw, designated CVE-2025-54939 and dubbed >>QUIC-LEAK,
-
Ivanti Connect Secure, Policy Secure, and ZTA Flaws Allow Attackers to Launch DoS Attacks
Ivanti has released critical security updates addressing multiple vulnerabilities in its Connect Secure, Policy Secure, and ZTA Gateway products that could allow remote attackers to launch denial-of-service attacks. The company disclosed four vulnerabilities on August 12, 2025, with CVSS scores ranging from medium to high severity, though no active exploitation has been detected at the…
-
Win-DoS’ Zero-Click Exploit Could Weaponize Windows Infrastructure for DDoS Attacks
Security researchers have uncovered a “zero-click” denial-of-service chain that can silently turn thousands of Microsoft Windows Domain Controllers (DCs) into a globe-spanning botnet, raising fresh alarms in a year already defined by record-breaking distributed-denial-of-service (DDoS) activity. DDoS attacks climbed 56% year-over-year in late-2024 according to Gcore’s latest Radar report, and Cloudflare’s network has already blocked…
-
‘Win-DDoS’: Researchers unveil botnet technique exploiting Windows domain controllers
Research revealed more DoS flaws: SafeBreach researchers also discovered CVE-2025-26673 in DC’s Netlogon service, where crafted RPC calls could crash the service remotely without authentication. By exploiting this weakness, attackers could knock out a critical Windows authentication component, potentially locking users out of domain resources until the system is rebooted. Similarly, CVE-2025-49716 targets Windows Local…
-
FUJIFILM Printer Flaw Allows Attackers to Trigger DoS Attacks
FUJIFILM Business Innovation has disclosed a critical vulnerability affecting multiple printer models that could allow attackers to launch denial-of-service (DoS) attacks through specially crafted network packets. The vulnerability, tracked as CVE-2025-48499, affects the Internet Printing Protocol (IPP) and Line Printer Daemon (LPD) protocol processing capabilities of affected devices. Vulnerability Details The security flaw stems from…
-
Novel malware from Russia’s APT28 prompts LLMs to create malicious Windows commands
Tags: ai, api, attack, computer, control, cyber, cyberattack, cybercrime, data, detection, dos, exploit, government, group, hacking, infrastructure, intelligence, LLM, malicious, malware, military, network, phishing, programming, russia, service, tool, ukraine, vulnerability, windows.pif (MS-DOS executable) extension, though variants with .exe and .py extensions have also been observed.CERT-UA attributes these attacks to a group it tracks as UAC-0001, but which is better known in the security community as APT28. Western intelligence agencies have officially associated this group with Unit 26165, or the 85th Main Special Service Center (GTsSS)…
-
Over 4 Million Exposed Devices Used in Two New DoS Attack Campaigns
Security researchers have discovered over 4 million vulnerable Internet hosts that can be weaponized for devastating new denial-of-service attacks, marking one of the largest infrastructure vulnerabilities uncovered in recent years. The groundbreaking research, conducted by Angelos Beitis and Mathy Vanhoef from DistriNet at KU Leuven, reveals that millions of devices worldwide accept unauthenticated tunneling traffic…
-
Apache Tomcat Coyote Flaw Allows Attackers to Launch DoS Attacks
The Apache Software Foundation has revealed a vulnerability in the Tomcat Coyote module, specifically within the Maven artifact org.apache.tomcat:tomcat-coyote, that could enable malicious actors to orchestrate denial-of-service (DoS) attacks. This flaw stems from an uncontrolled resource consumption issue tied to HTTP/2 protocol handling, potentially allowing attackers to overwhelm server resources by manipulating stream concurrency limits.…
-
Next.js Vulnerability Allows Attackers to Trigger DoS via Cache Poisoning
A critical vulnerability, tracked asCVE-2025-49826, has been discovered and addressed in the popular React-based web framework, Next.js. The flaw, present in versions >=15.1.0 and <15.1.8, allowed attackers to exploit a cache poisoning bug, potentially leading to a Denial of Service (DoS) condition for affected applications, as per a report by Vercel. CVE ID Affected Versions Severity…
-
Multiple PHP Vulnerabilities Enables SQLi and DoS Attacks Update Now
Security researchers have disclosed two significant vulnerabilities in PHP, the popular server-side scripting language, that could allow attackers to launch SQL injection (SQLi) and Denial of Service (DoS) attacks. According to the report, Administrators and developers are urged to update their PHP installations immediately to mitigate these risks. CVE ID Component Severity Affected Versions Patched…
-
ModSecurity WAF Vulnerability Enables DoS Using Empty XML Elements
A newly disclosed vulnerability in ModSecurity, a widely used open-source web application firewall (WAF), exposes servers to denial-of-service (DoS) attacks by exploiting a flaw in the way the software parses empty XML elements. The flaw, registered asCVE-2025-52891, affects ModSecurity versions2.9.8 to before 2.9.11and is rated with aCVSS v3 base score of 6.5 (moderate severity). Vulnerability…
-
CVE-2025-5777, CVE-2025-6543: Frequently Asked Questions About CitrixBleed 2 and Citrix NetScaler Exploitation
Frequently asked questions about recent Citrix NetScaler ADC and Gateway vulnerabilities that have reportedly been exploited in the wild, including CVE-2025-5777 known as CitrixBleed 2. Background Tenable’s Research Special Operations (RSO) team has compiled this blog to answer Frequently Asked Questions (FAQ) regarding CVE-2025-5777 and CVE-2025-6543, two Citrix NetScaler ADC and Gateway vulnerabilities that have…
-
Frequently Asked Questions About Iranian Cyber Operations
Tags: access, advisory, api, apt, attack, authentication, awareness, cisa, cloud, credentials, cve, cyber, cybersecurity, data, data-breach, defense, dos, exploit, finance, framework, government, group, Hardware, identity, infrastructure, injection, Internet, iran, ivanti, malware, mfa, microsoft, middle-east, military, mitre, monitoring, network, password, ransomware, rce, remote-code-execution, risk, service, software, supply-chain, tactics, technology, terrorism, threat, tool, update, vpn, vulnerability, windowsTenable’s Research Special Operations team focuses on some frequently asked questions about Iranian cyber operations, including the tactics, techniques and procedures employed by Iran-based threat actors. Background Tenable’s Research Special Operations (RSO) team has compiled this blog to answer Frequently Asked Questions (FAQ) regarding Iranian cyber operations in the wake of the recent conflict and…
-
Pre-Auth Flaw in MongoDB Server Allows Attackers to Cause DoS
A critical pre-authentication vulnerability (CVE-2025-6709) in MongoDB Server enables unauthenticated attackers to trigger denial-of-service (DoS) conditions by exploiting improper input validation in OIDC authentication. The flaw allows malicious actors to crash database servers by sending specially crafted JSON payloads containing specific date values, causing invariant failures and server crashes. This vulnerability affects MongoDB Server versions…
-
Citrix warns of NetScaler vulnerability exploited in DoS attacks
Citrix is warning that a vulnerability in NetScaler appliances tracked as CVE-2025-6543 is being actively exploited in the wild, causing devices to enter a denial of service condition. First seen on bleepingcomputer.com Jump to article: www.bleepingcomputer.com/news/security/citrix-warns-of-netscaler-vulnerability-exploited-in-dos-attacks/
-
Realtek Bluetooth Flaw Allows Attackers to Launch DoS Attacks During Pairing
A critical vulnerability in Realtek’s Bluetooth Low Energy (BLE) implementation enables attackers to launch denial-of-service (DoS) attacks during device pairing. The flaw (CVE-2024-48290) affects Realtek RTL8762E BLE SDK v1.4.0, allowing malicious actors to disrupt connections by exploiting protocol inconsistencies. Attackers can send a crafted ll_terminate_ind packet or inject premature pairing data, crashing the target device’s Bluetooth stack…
-
Cyberangriff auf das Gesundheits- und Sozialministerium in Paraguay
Nuevo ataque cibernético a dos instituciones del Estado First seen on hoy.com.py Jump to article: www.hoy.com.py/nacionales/2025/06/23/nuevo-ataque-cibernetico-a-dos-instituciones-del-estado
-
Cyberangriff auf eine Justizbehörde in Paraguay
Nuevo ataque cibernético a dos instituciones del Estado First seen on hoy.com.py Jump to article: www.hoy.com.py/nacionales/2025/06/23/nuevo-ataque-cibernetico-a-dos-instituciones-del-estado
-
CVE-2025-49763 Remote DoS via Memory Exhaustion in Apache Traffic Server via ESI Plugin
Remote attackers can trigger an avalanche of internal ESI requests, exhausting memory and causing denial-of-service in Apache Traffic Server. Executive Summary Imperva’s Offensive Security Team discovered CVE-2025-49763, a high-severity vulnerability (CVSS v3.1 estimated score: 7.5) in Apache Traffic Server’s ESI plugin that enables unauthenticated attackers to exhaust memory and potentially crash proxy nodes. Given ATS’s……
-
Apache Tomcat Flaws Allow Auth Bypass and DoS Attacks
Tags: apache, attack, authentication, cyber, dos, flaw, open-source, service, software, update, vulnerabilityThe Apache Software Foundation has released critical security updates to address four newly discovered vulnerabilities in Apache Tomcat, one of the world’s most widely used open-source Java servlet containers. These flaws, affecting Tomcat versions 9.0, 10.1, and 11.0, expose systems to denial-of-service (DoS) attacks, privilege escalation, installer abuse, and authentication bypass, prompting urgent calls for…
-
Ungepatchte Lücken ermöglichen Übernahme von GitLab-Konten
Tags: access, authentication, best-practice, bug, ceo, ciso, cve, cvss, cyberattack, dos, github, gitlab, incident response, injection, jobs, mfa, password, risk, sans, service, software, update, vulnerabilityExperten warnen vor einem neuen Bug in GitLab.Eine neue Sicherheitslücke in der Ultimate Enterprise Edition von GitLab ist laut einem Experten ‘gefährlich” und muss schnell gepatcht werden.Die Schwachstelle mit der Bezeichnung CVE-2025-5121 ist eine von zehn, die GitLab am Mittwoch bei der Veröffentlichung von Bugfixes und Sicherheits-Updates für selbstverwaltete Installationen beschrieben hat.’Wir empfehlen dringend, alle…
-
Ransomware bei einer Stadtverwaltung in Brasilien
Após sofrer ataque cibernético, Prefeitura retoma a regularidade dos serviços online First seen on chapadaodosul.ms.gov.br Jump to article: www.chapadaodosul.ms.gov.br/portal/noticias/0/3/1234/apos-sofrer-ataque-cibernetico-prefeitura-retoma-a-regularidade-dos-servicos-online
-
PoC Exploit Released for Apache Tomcat DoS Vulnerability
A critical memory leak vulnerability in Apache Tomcat’s HTTP/2 implementation (CVE-2025-31650) has been weaponized, enabling unauthenticated denial-of-service attacks through malformed priority headers. The flaw affects Tomcat versions 9.0.769.0.102, 10.1.1010.1.39, and 11.0.0-M211.0.5, with public exploits already circulating 12. Vulnerability Mechanics and Attack Vector According to the report, the vulnerability stems from the improper cleanup of failed…
-
Wireshark Vulnerability Allows Attackers to Launch DoS Attacks
A critical security vulnerability, tracked as CVE-2025-5601, was disclosed on June 4, 2025, affecting Wireshark versions 4.4.0 to 4.4.6 and 4.2.0 to 4.2.12. This flaw, identified as >>Dissection engine crash
-
New Windows RAT Evades Detection for Weeks Using Corrupted DOS and PE Headers
Cybersecurity researchers have taken the wraps off an unusual cyber attack that leveraged malware with corrupted DOS and PE headers, according to new findings from Fortinet.The DOS (Disk Operating System) and PE (Portable Executable) headers are essential parts of a Windows PE file, providing information about the executable.While the DOS header makes the executable file…
-
Siemens SiPass Flaw Allows Remote Attackers to Cause DoS Conditions
Siemens has released a security advisory (SSA-041082) concerning a critical out-of-bounds read vulnerability, tracked as CVE-2022-31812, affecting all SiPass integrated versions before V2.95.3.18. The flaw, if exploited, could allow unauthenticated remote attackers to trigger a denial of service (DoS) condition, potentially disrupting access control operations for organizations relying on SiPass for physical security management. The…
-
Several GitLab Vulnerabilities Enable Attackers to Launch DoS Attacks
GitLab has issued critical security patches addressing 11 vulnerabilities across its Community Edition (CE) and Enterprise Edition (EE) platforms, with three high-risk flaws enabling denial-of-service (DoS) attacks dominating the threat landscape. The coordinated release of versions 18.0.1, 17.11.3, and 17.10.7 comes as the DevOps platform confronts multiple attack vectors that could destabilize systems through resource…
-
PowerDNS Vulnerability Allows Attackers to Trigger DoS Attacks Through Malicious TCP Connections
PowerDNS has released a critical security update to address a vulnerability in its DNSdist load balancer that could allow remote attackers to trigger denial of service attacks without authentication. The issue, tracked as CVE-2025-30193, was patched in version 1.9.10 released on May 20, 2025. Security researchers warn that organizations using DNSdist should apply this update…
-
Apache ActiveMQ Vulnerability Allows Attackers to Induce DoS Condition
Tags: apache, attack, cyber, dos, flaw, malicious, mitigation, open-source, service, software, vulnerabilityCritical vulnerability in Apache ActiveMQ (CVE-2024-XXXX) exposes brokers to denial-of-service (DoS) attacks by allowing malicious actors to exhaust system memory through specially crafted OpenWire commands. The flaw, tracked as AMQ-6596, affects multiple legacy versions of the widely used open-source messaging platform and has prompted urgent mitigation directives from the Apache Software Foundation. The vulnerability stems…