Cisco Talos Reports Exploitation of Public-Facing Apps as Leading Initial Access Vector
Cisco Talos Incident Response reported that exploitation of public-facing applications remained the top initial access method for a second consecutive quarter, appearing in nearly 40% of Q4 2025 engagements (down from 60%+ in Q3, when ToolShell activity surged). Talos highlighted rapid attacker uptake of newly disclosed vulnerabilities, including Oracle E-Business Suite CVE-2025-61882 and React2Shell CVE-2025-55182 (impacting React Server Components/Next.js and related frameworks), with exploitation observed around the time the issues became public—reinforcing the operational risk of internet-facing enterprise apps and default framework deployments.
The same Talos reporting noted phishing as the second most common initial access vector, including a credential-harvesting campaign targeting Native American tribal organizations that used compromised legitimate accounts to propagate additional internal phishing. Ransomware represented roughly 13% of engagements (down from ~20% the prior quarter and far below early-2025 levels), with Qilin continuing to feature prominently and no previously unseen ransomware variants observed. Separate coverage amplified Talos’ findings as a call for faster patching, citing examples where proof-of-concept code and exploitation activity emerged within hours to ~30 hours of disclosure for high-profile bugs like React2Shell and Oracle EBS.
Timeline
Jan 29, 2026
Cisco Talos publishes Q4 2025 incident response trends report
On January 29, 2026, Cisco Talos published its Q4 2025 IR trends report, highlighting exploitation as the top initial access vector for the second consecutive quarter and warning that attackers are weaponizing vulnerabilities within hours. The report also emphasized recurring defensive gaps in patching, MFA, and centralized logging.
Dec 31, 2025
Ransomware incidents fall in Q4 2025 as Qilin remains dominant
Cisco Talos found ransomware and pre-ransomware incidents declined to about 13% of engagements in Q4 2025, down from 20% in Q3 and roughly 50% in Q1 and Q2. Qilin remained the dominant ransomware family in Talos IR cases, while DragonForce reappeared after about a year.
Oct 1, 2025
Phishing campaign targets Native American tribal organizations
Talos observed a credential-harvesting phishing campaign aimed at Native American tribal organizations during Q4 2025. Compromised accounts were then reused for internal and external follow-on phishing, with MFA weaknesses contributing to access.
Oct 1, 2025
Talos observes suspected Cisco appliance compromises using BadCandy and AquaShell
In Q4 2025 incident response work, Talos saw implants previously associated with APT-linked operations, including BadCandy on Cisco IOS XE and AquaShell in a suspected Cisco Secure Management Appliance compromise. Talos said neither case showed follow-on interactive activity.
Oct 1, 2025
React2Shell proof-of-concept circulates within about 30 hours
A functional proof-of-concept for the React2Shell vulnerability was reported to be circulating roughly 30 hours after public release. The rapid availability of exploit code underscored how quickly newly disclosed flaws were being operationalized.
Oct 1, 2025
Attackers rapidly exploit Oracle EBS and React2Shell flaws in Q4 2025
During Q4 2025, Talos observed threat actors exploiting Oracle E-Business Suite CVE-2025-61882 and React Server Components/Next.js-related CVE-2025-55182 ('React2Shell') shortly after public disclosure. In one case, exploitation led to deployment of the XMRig Monero cryptominer.
Sep 30, 2025
ToolShell exploitation drives most intrusions in Q3 2025
Cisco Talos reported that exploitation of public-facing applications accounted for about 62% of incident response engagements in Q3 2025, largely driven by ToolShell activity. This established exploitation as the leading initial access vector heading into the next quarter.
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