All news with #zero-day tag

Citrix warns of NetScaler ADC/Gateway zero-day exploit

⚠️ Citrix has warned of multiple zero-day vulnerabilities in NetScaler ADC and NetScaler Gateway, highlighting CVE-2025-7775 as being actively exploited. The critical issue is a memory overflow that can lead to denial of service or remote code execution on appliances meeting specific configuration preconditions. Citrix provides CLI checks to identify affected devices but reports no mitigations or workarounds, and researchers estimate a large percentage of appliances remain unpatched. Administrators are urged to prioritize patching immediately.

Palo Alto Networks Named Leader in HMF Magic Quadrant

🔐 Palo Alto Networks has been named a Leader in the inaugural 2025 Gartner Magic Quadrant for Hybrid Mesh Firewall, recognized for both Completeness of Vision and Ability to Execute. The announcement highlights the Strata Network Security Platform, which unifies hardware, virtual, container, cloud-native and FWaaS deployments under a single, cloud-based management plane. Powered by Precision AI®, the platform delivers consistent policy, automation and real-time threat prevention across hybrid environments.

Citrix Patches NetScaler Zero-Days as Active Exploits Continue

🔒Citrix has released patches for three critical zero-day vulnerabilities in NetScaler ADC and NetScaler Gateway (CVE-2025-7775, CVE-2025-7776, CVE-2025-8424), including pre-auth remote code execution observed in the wild. The vendor provided fixes for affected 14.1, 13.1 and 12.1-FIPS/NDcPP builds and said no workaround is available. Security researchers and CISA urged immediate patching and forensic checks for potential backdoors.

Weekly Recap: Password Manager Clickjacking Flaws and Threats

🔒 This week's recap spotlights a DOM-based extension clickjacking technique disclosed by researcher Marek Tóth at DEF CON that affects popular browser password manager plugins. Vendors including Bitwarden, Dashlane, Enpass, KeePassXC-Browser, Keeper, LastPass, NordPass, ProtonPass, and RoboForm issued fixes by August 22. Other leading stories cover legacy Cisco devices exploited for persistent access, an actively exploited Apple 0-day in ImageIO, cloud intrusions leveraging trusted partner relationships, and several high-risk CVEs to prioritize.

MURKY PANDA: Trusted-Relationship Cloud Threats and TTPs

🔒 Since late 2024 CrowdStrike's Counter Adversary Operations has tracked MURKY PANDA, a China‑nexus actor targeting government, technology, academic, legal and professional services in North America. The group exploits internet‑facing appliances, rapidly weaponizes n‑day and zero‑day flaws, and deploys web shells (including Neo‑reGeorg) and the Golang RAT CloudedHope. CrowdStrike recommends auditing Entra ID service principals and activity, enabling Microsoft Graph logging, hunting for anomalous service principal sign‑ins, prioritizing patching of cloud and edge devices, and leveraging Falcon detection and SIEM capabilities.

Dissecting PipeMagic: Architecture of a Modular Backdoor

🔍 Microsoft Threat Intelligence details PipeMagic, a modular backdoor used by Storm-2460 that masquerades as an open-source ChatGPT Desktop Application. The malware is deployed via an in-memory MSBuild dropper and leverages named pipes and doubly linked lists to stage, self-update, and execute encrypted payload modules delivered from a TCP C2. Analysts observed exploitation of CVE-2025-29824 for privilege escalation followed by ransomware deployment, with victims across IT, finance, and real estate in multiple regions. The report includes selected IoCs, Defender detections, and mitigation guidance to help defenders detect and respond.

EchoLink: Rise of Zero-Click AI Exploits in M365 Enterprise

⚠️ EchoLink is a newly identified zero-click vulnerability in Microsoft 365 Copilot that enables silent exfiltration of enterprise data without any user interaction. This class of attack bypasses traditional click- or download-based defenses and moves laterally at machine speed, making detection and containment difficult. Organizations relying solely on native tools or fragmented point solutions should urgently reassess their exposure and incident response readiness.

WinRAR zero-day (CVE-2025-8088) used in RomCom attacks

🔒 ESET researchers uncovered a previously unknown WinRAR vulnerability, tracked as CVE-2025-8088, that is being actively exploited by the Russia-aligned actor RomCom in targeted spearphishing campaigns. The Windows path traversal flaw enables execution of arbitrary code when victims open crafted archives. Users should update to WinRAR 7.13 immediately and consult ESET's video and blogpost for indicators and mitigation.

WinRAR zero-day (CVE-2025-8088) exploited by RomCom

🔒 ESET researchers disclosed a previously unknown WinRAR zero-day, CVE-2025-8088, actively exploited by the Russia-aligned group RomCom. The flaw is a path-traversal vulnerability that leverages NTFS alternate data streams (ADS) to conceal malicious files in RAR archives, which are silently deployed on extraction. Observed payloads included a Mythic agent, a SnipBot variant, and RustyClaw (MeltingClaw), targeting organizations in finance, manufacturing, defense and logistics. Users and vendors relying on WinRAR, UnRAR.dll or its source must update to the July 30, 2025 patched release immediately.

Microsoft Bounty Program: $17M Distributed in 2025

🔒 The Microsoft Bounty Program distributed $17 million this year to 344 security researchers across 59 countries, marking the largest total payout in the program’s history. In partnership with the Microsoft Security Response Center (MSRC), researchers helped identify and remediate more than a thousand potential vulnerabilities across Azure, Microsoft 365, Windows, and other Microsoft products and services. The program also expanded coverage and awards for Copilot, identity and Defender scopes, Dynamics 365 & Power Platform AI categories, and refreshed Windows attack scenario incentives to prioritize high-impact research.

Zero Day Quest returns with up to $5M bounties for Cloud

🔒 Microsoft is relaunching Zero Day Quest with up to $5 million in total bounties for high-impact Cloud and AI security research. The Research Challenge runs 4 August–4 October 2025 and focuses on targeted scenarios across Azure, Copilot, Dynamics 365 and Power Platform, Identity, and M365. Eligible critical findings receive a +50% bounty multiplier, and top contributors may be invited to an exclusive live hacking event at Microsoft’s Redmond campus in Spring 2026. Participants will have access to training from the AI Red Team, MSRC, and product teams, and Microsoft will support transparent, responsible disclosure.

ToolShell SharePoint Vulnerabilities and Ongoing Exploitation

🔔 Unit 42 reports active exploitation of multiple on‑premises SharePoint vulnerabilities collectively dubbed ToolShell, enabling unauthenticated remote code execution, authentication bypass, and path traversal. Activity observed from mid‑July 2025 includes web shell deployment, theft of ASP.NET MachineKeys and ViewState material, and delivery of the 4L4MD4R ransomware in at least one chain. Organizations with internet‑exposed SharePoint servers should assume potential compromise and follow containment, patching, cryptographic rotation, and incident response guidance immediately.

July 2025 Cybersecurity Roundup: Key Incidents and Risks

🛡️ In July 2025, ESET Chief Security Evangelist Tony Anscombe highlighted major cybersecurity incidents, including exploitation of ToolShell zero‑day vulnerabilities in on‑premises Microsoft SharePoint and the confirmed return of Lumma Stealer. Other critical stories included a ransomware attack that closed UK transport firm KNP, a massive data exposure in McDonald's hiring chatbot McHire, and the discovery of PerfektBlue Bluetooth flaws affecting vehicles. The UK also proposed banning ransom payments by public bodies.

SharePoint under fire: ToolShell zero-day attacks worldwide

🛡️ ESET's research details active exploitation of two zero-day vulnerabilities—CVE-2025-53770 and CVE-2025-53771—against on-premises Microsoft SharePoint servers in a campaign dubbed ToolShell. The company reports global impact, with the United States responsible for 13.3% of observed attacks. Organizations should immediately prioritize patching affected servers, apply vendor mitigations, tighten access controls and monitoring, and review logs for indicators of compromise. Watch the accompanying video featuring ESET Chief Security Evangelist Tony Anscombe and consult the full blogpost for technical detail.

ToolShell SharePoint Zero-Days Exploited in the Wild

🔒 Microsoft and ESET reported active exploitation of a SharePoint Server vulnerability cluster called ToolShell, comprising CVE-2025-53770 (remote code execution) and CVE-2025-53771 (server spoofing). Attacks began on July 17, 2025, and target on-prem SharePoint Subscription Edition, SharePoint 2019 and SharePoint 2016; SharePoint Online is not affected. Operators deployed webshells — notably spinstall0.aspx (detected as MSIL/Webshell.JS) and several ghostfile*.aspx samples — to bypass MFA/SSO, exfiltrate data and move laterally across integrated Microsoft services. Microsoft and ESET confirmed patches were released on July 22, and ESET published IoCs and telemetry to assist defenders.

Customer Guidance for SharePoint CVE-2025-53770 Patch

🔒 Microsoft warns of active attacks against on-premises SharePoint Server and has issued security updates that fully remediate CVE-2025-53770 and CVE-2025-53771 for supported versions. Customers should apply the published updates immediately, enable AMSI with HTTP request body scanning where available, and deploy endpoint protections such as Microsoft Defender for Endpoint. After patching, rotate ASP.NET machine keys and restart IIS to complete mitigation; SharePoint Online is not affected.

A Summer of Security: Empowering Defenders with AI

🛡️ Google outlines summer cybersecurity advances that combine agentic AI, platform improvements, and public-private partnerships to strengthen defenders. Big Sleep—an agent from DeepMind and Project Zero—has discovered multiple real-world vulnerabilities, most recently an SQLite flaw (CVE-2025-6965) informed by Google Threat Intelligence, helping prevent imminent exploitation. The company emphasizes safe deployment, human oversight, and standard disclosure while extending tools like Timesketch (now augmented with Sec‑Gemini agents) and showcasing internal systems such as FACADE at Black Hat and DEF CON collaborations.