Incident Score: Analysis & Impact (CIS1766051696)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Cisco's Vulnerability and lateral movement inside company's environment.
- Overview of affected data sets, including SSNs and PHI, and why they materially increase incident severity.
- How Rankiteo’s incident engine converts technical details into a normalized incident score.
- How this cyber incident impacts Cisco Rankiteo cyber scoring and cyber rating.
- Rankiteo’s MITRE ATT&CK correlation analysis for this incident, with associated confidence level.
Full Incident Analysis Transcript
In this Rankiteo incident briefing, we review the Cisco breach identified under incident ID CIS1766051696.
The analysis begins with a detailed overview of Cisco's information like the linkedin page: https://www.linkedin.com/company/cisco, the number of followers: 7281720, the industry type: Software Development and the number of employees: 95370 employees
After the initial compromise, the video explains how Rankiteo's incident engine converts technical details into a normalized incident score. The incident score before the incident was 329 and after the incident was 328 with a difference of -1 which is could be a good indicator of the severity and impact of the incident.
In the next step of the video, we will analyze in more details the incident and the impact it had on Cisco and their customers.
Cisco recently reported "Cisco Secure Email Gateway and Web Manager Appliances Exploited via CVE-2025-20393", a noteworthy cybersecurity incident.
Cisco has identified an ongoing cyberattack campaign exploiting vulnerabilities in Cisco AsyncOS Software for Cisco Secure Email Gateway and Cisco Secure Email and Web Manager appliances.
The disruption is felt across the environment, affecting Cisco Secure Email Gateway and Cisco Secure Email and Web Manager appliances.
In response, moved swiftly to contain the threat with measures like Restricting appliance access to known, trusted hosts, Deploying appliances behind firewalls and Separating mail and management network interfaces, and began remediation that includes Upgrading to the latest Cisco AsyncOS Software release, Rebuilding compromised appliances and Implementing strong authentication methods (SAML, LDAP), while recovery efforts such as Monitoring web logs and sending logs to external servers and Reviewing deployment guides for security best practices continue.
The case underscores how Ongoing, teams are taking away lessons such as Misconfigured ports and exposed services can lead to full system compromise. Organizations must restrict access, monitor logs, and follow security best practices to mitigate risks, and recommending next steps like Immediately assess exposure and restrict access to appliances, Consult Cisco TAC for potential compromises and Continuously monitor and patch appliances.
Finally, we try to match the incident with the MITRE ATT&CK framework to see if there is any correlation between the incident and the MITRE ATT&CK framework.
The MITRE ATT&CK framework is a knowledge base of techniques and sub-techniques that are used to describe the tactics and procedures of cyber adversaries. It is a powerful tool for understanding the threat landscape and for developing effective defense strategies.
MITRE ATT&CK® Correlation Analysis
Rankiteo's analysis has identified several MITRE ATT&CK tactics and techniques associated with this incident, each with varying levels of confidence based on available evidence. Under the Initial Access tactic, the analysis identified Exploit Public-Facing Application (T1190) with high confidence (95%), with evidence including exploiting vulnerabilities in Cisco Secure Email Gateway, and cVE-2025-20393 (CVSS 10.0) allows arbitrary command execution and External Remote Services (T1133) with moderate to high confidence (85%), with evidence including exposed ports enabled unauthorized root access, and spam Quarantine feature exposed to the internet. Under the Execution tactic, the analysis identified Command and Scripting Interpreter (T1059) with high confidence (90%), supported by evidence indicating execute arbitrary commands with root privileges. Under the Privilege Escalation tactic, the analysis identified Exploitation for Privilege Escalation (T1068) with high confidence (95%), supported by evidence indicating cVE-2025-20393 allows root privilege execution. Under the Persistence tactic, the analysis identified Create Account (T1136) with moderate to high confidence (70%), supported by evidence indicating persistence mechanisms for long-term control and Create or Modify System Process (T1543) with moderate to high confidence (80%), supported by evidence indicating implant persistence mechanisms in compromised appliances. Under the Defense Evasion tactic, the analysis identified Impair Defenses: Disable or Modify Tools (T1562.001) with moderate to high confidence (85%), supported by evidence indicating disable security tools on compromised appliances. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (70%), supported by evidence indicating potential data exfiltration via covert channels. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Cisco Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/cisco/incident/CIS1766051696
- Cisco CyberSecurity Rating page: https://www.rankiteo.com/company/cisco
- Cisco Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/cis1766051696-vulnerability-december-2025/
- Cisco CyberSecurity Score History: https://www.rankiteo.com/company/cisco/history
- Cisco CyberSecurity Incident Source: https://thecyberexpress.com/cisco-cve-2025-20393-secure-email-cyberattack/
- Rankiteo A.I CyberSecurity Rating methodology: https://www.rankiteo.com/Images/rankiteo_algo.pdf
- Rankiteo TPRM Scoring methodology: https://static.rankiteo.com/model/rankiteo_tprm_methodology.pdf