All news with #cisco tag

⚠️ Government security agencies have urged immediate patching of a critical zero-day, CVE-2026-20127, impacting Cisco Catalyst SD-WAN Controller and SD-WAN Manager. The authentication bypass can grant unauthenticated remote attackers administrative privileges, NETCONF access and the ability to alter SD-WAN configuration. Authorities including CISA and Five Eyes partners require urgent patching and threat hunting; Cisco released fixes on 25 February 2026.

🔒 A maximum-severity vulnerability in Cisco Catalyst SD-WAN, tracked as CVE-2026-20127 (CVSS 10.0), lets an unauthenticated remote attacker bypass authentication and obtain elevated administrative privileges by sending a crafted request. Cisco reports active exploitation across on-prem and Cisco-hosted deployments by a sophisticated actor identified as UAT-8616, with malicious activity dating to 2023. Customers should apply vendor fixes immediately, audit /var/log/auth.log for unexpected "Accepted publickey for vmanage-admin" entries, and follow CISA emergency guidance.

⚠️ Federal and allied cybersecurity agencies issued an emergency directive after Cisco Talos disclosed active exploitation of a critical flaw in Cisco Catalyst SD-WAN controllers (CVE-2026-20127). The vulnerability allows unauthenticated attackers to bypass authentication and gain administrative access to SD‑WAN control-plane components. Cisco has released patches with no workarounds; CISA and Five Eyes partners urge immediate patching, inventorying of in-scope systems, log collection and active hunting for compromise.

⚠️ Cisco warns of a critical authentication bypass in Cisco Catalyst SD-WAN (CVE-2026-20127) that has been exploited in zero-day attacks beginning in 2023. The flaw allows attackers to authenticate as a high-privileged non-root account, add rogue peers, and manipulate NETCONF to alter SD-WAN fabric configuration. Cisco and partners report active exploitation, and vendors have issued software updates; there are no full workarounds, so immediate patching and hardening are urged.

🔒 Cisco Talos reports active exploitation of CVE-2026-20127 in Cisco Catalyst SD-WAN Controller, enabling unauthenticated attackers to bypass authentication and obtain administrative privileges. Talos attributes the activity to a sophisticated actor tracked as UAT-8616 and finds evidence dating to 2023, including software downgrades and subsequent exploitation of CVE-2022-20775 to escalate to root. Customers are urged to follow vendor advisories, validate control peering events, and apply the detection and remediation guidance provided.

⚠ CISA issued Emergency Directive 26-03 requiring immediate mitigation of critical vulnerabilities in Cisco SD‑WAN systems, citing exploitable flaws including CVE-2026-20127 and CVE-2022-20775. Agencies must inventory systems, collect virtual snapshots and logs, apply patches, hunt for evidence of compromise, and implement vendor hardening guidance. CISA will monitor compliance, provide technical assistance, and deliver additional resources as needed. The directive is supported by the NSA, ASD’s ACSC, Canada’s Cyber Centre, NCSC-NZ, and NCSC-UK.

🔔 CISA and international partners warn of active exploitation of Cisco SD-WAN systems, adding CVE-2026-20127 and CVE-2022-20775 to the Known Exploited Vulnerabilities Catalog. FCEB agencies are required by Emergency Directive 26-03 to inventory, update, and assess SD-WAN deployments. Organizations should collect artifacts, apply vendor updates, follow the Catalyst SD-WAN Hardening Guide, and hunt for evidence of compromise immediately.

⚠️CISA has added two Cisco SD‑WAN vulnerabilities (CVE‑2022‑20775 and CVE‑2026‑20127) to the Known Exploited Vulnerabilities (KEV) Catalog based on evidence of active exploitation. These affect Cisco Catalyst SD‑WAN components and include a path traversal and an authentication bypass that can enable unauthorized access. Under BOD 22‑01, FCEB agencies must remediate by required due dates; CISA urges all organizations to prioritize timely mitigation.

🔎 Ryan Liles describes his role connecting Cisco product teams with independent evaluators to ensure products are tested and validated beyond vendor claims. As part of Talos’ Vulnerability Research and Discovery group, he coordinates third-party testing labs and navigates sensitive conversations about methodology and deployment. Liles stresses calm, fact-focused dialogue and long-standing industry relationships to resolve issues and improve testing outcomes.

🛡️ Cisco Talos discovered DKnife, a modular AitM framework operating on Linux-based network gateways since at least 2019 and active into early 2026. Deployed at the edge rather than endpoints, it performs deep packet inspection, credential interception, and selective traffic manipulation. Operators use it to hijack software and app updates to deliver ShadowPad and DarkNimbus payloads, and to perform DNS and binary replacement attacks.

🛡️ Cisco Talos researchers describe DKnife as an ELF-based Linux toolkit used since 2019 to hijack router traffic and perform adversary-in-the-middle operations. The framework has seven modules — including yitiji.bin to create a bridged TAP interface and mmdown.bin to drop malicious APKs — enabling DPI, credential harvesting, and delivery of backdoors such as ShadowPad and DarkNimbus. Talos attributes the activity to a China-nexus actor and noted C2 servers remained active as of January 2026.

🔍 Cisco Talos researchers uncovered DKnife, a Linux-based gateway-monitoring and adversary-in-the-middle framework used since at least 2019 and active through January 2026. The toolkit targets routers and edge devices running CentOS/Red Hat Enterprise Linux, using seven ELF components to perform DPI, traffic interception, DNS hijacking and in-line substitution of Android and Windows downloads. Talos attributes the framework with high confidence to Chinese-nexus actors and notes overlaps with campaigns delivering WizardNet, DarkNimbus and ShadowPad.

🔒 Cisco Talos researchers disclosed DKnife, a modular Linux-based adversary-in-the-middle (AitM) framework used by China-linked actors since at least 2019. The toolkit deploys seven router-focused implants to perform deep packet inspection, TLS termination, DNS and update hijacking, credential harvesting, and malware delivery via intercepted APKs and binary replacement. Operators used DKnife to push ShadowPad and DarkNimbus variants and to target Chinese-language services and app updates through compromised routers and edge devices.

🚨 As AI agent frameworks surge, Talos warns of two immediate threats: Clawdbot — a popular open-source agentic tool (aka Moltbot/OpenClaw) that requires users to store credentials and API keys locally and can accept unvetted Skills granted broad system privileges. DKnife, active since at least 2019, is a modular Linux attack framework that compromises routers and edge devices to intercept traffic, hijack updates, and deliver malware while evading many endpoint defenses. The newsletter urges skepticism toward rushed AI tools and recommends hardening gateways, auditing firmware, enforcing strong authentication, and monitoring for suspicious update behaviors.

📰 Hazel Burton opens this Threat Source newsletter by acknowledging how difficult it can be to stay engaged with the news and suggests small, human respites—like the U.K. show Taskmaster—to remind readers creativity and levity persist under pressure. On the technical side, Cisco Talos Incident Response’s Q4 2025 report shows exploitation of public-facing applications remains the leading initial access vector (down from 62% to ~40%), while phishing and credential harvesting rose and ransomware incidents fell to 13% with Qilin still common. The newsletter urges rapid patching, correct MFA configuration and monitoring, and comprehensive logging to detect suspicious activity.

🔍 Cisco Talos has identified a UAT-8099 campaign active from August 2025 through early 2026 that targets vulnerable IIS servers across Asia, concentrating on victims in Thailand and Vietnam. The actor uses web shells, PowerShell, and the GotoHTTP remote-control tool to maintain access and deploy region-customized BadIIS variants that hardcode country codes and inject SEO-fraud content. New persistence mechanisms, hidden accounts, and log-wiping utilities support long-term stealth and evasion.

🔒 Talos Incident Response (Talos IR) reports that in Q4 2025 threat actors again favored exploitation of public-facing applications, appearing in nearly 40% of engagements, while phishing rose to the second-most common initial access vector. Notable exploit activity targeted Oracle E-Business Suite (CVE-2025-61882) and React2Shell (CVE-2025-55182), and attackers rapidly weaponized these flaws close to disclosure. Talos also observed deployment of APT-linked implants such as BadCandy and AquaShell, plus campaigns that targeted Native American tribal organizations for credential harvesting. The report emphasizes timely patching, strong MFA controls, centralized logging, and rapid incident response to limit impact.

🔍 Cisco Talos stresses the simple but essential advice: know your environment, and pay attention to reconnaissance rather than dismissing it as noise. Researchers disclosed patched vulnerabilities in Foxit PDF Editor, Epic Games Store, and MedDream PACS, including privilege escalation, use‑after‑free, and XSS that could enable code execution or unauthorized access. The newsletter also covers active phishing and ransomware activity and provides telemetry on prevalent malware. Organizations should patch affected products, enhance detection for recon patterns, and apply layered defenses.

🔒 Cisco Talos disclosed multiple vulnerabilities affecting Foxit PDF Editor, the Epic Games Store installer, and MedDream PACS. The issues include installer privilege escalation, two use‑after‑free flaws in Foxit that can be triggered by crafted PDF JavaScript, and 21 reflected XSS vulnerabilities in MedDream. Vendors have issued patches under Cisco’s disclosure policy. Administrators should apply vendor updates and consider IDS/IPS signatures such as Snort to detect attempted exploitation.

⚠️ Cisco has released patches for a critical remote code execution vulnerability, CVE-2026-20045, affecting Unified Communications Manager, Unity Connection, and Webex Calling Dedicated Instance. The flaw allows unauthenticated remote attackers to gain user access via crafted HTTP requests and then escalate privileges to root without user interaction. No workarounds exist; fixes are version-specific and organizations should apply the matching patch or migrate unsupported 12.5 systems.