CTI Submission: https://cloud.google.com/blog/topics/threat-intell...

[theredcorsair]

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Zero-Day Exploitation of Vulnerability (CVE-2026-20245) in Cisco Catalyst SD-WAN Manager

Stop attacks, reduce risk, and advance your security.

Written by: Chester Sng, Pete Boonyakarn, Logeswaran Nadarajan

In early 2026, Mandiant identified a threat actor targeting SD-WAN infrastructure at a service provider. After gaining initial access, the threat actor exploited a zero-day vulnerability (CVE-2026-20245) in Cisco Catalyst SD-WAN to escalate privileges from a compromised administrative accou...

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Link to Original Source

https://cloud.google.com/blog/topics/threat-intelligence/zero-day-exploitation-cisco-catalyst-sd-wan-manager

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[letswastetimee]

✅ A new hunt has been drafted from your submission! (Attempt 1/5)

Hypothesis: Threat actors are exploiting file upload functionality in Cisco Catalyst SD-WAN Manager by uploading malicious CSV files containing embedded commands that append unauthorized root-privileged user accounts to /etc/passwd and /etc/shadow files to escalate from administrative to root-level access.

Please review the updated file here:
View Hunt Draft

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🔍 Duplicate Detection Results:
Top 3 closest existing hunts:

🔴 H-2026-004.md — 85% similar
Both target Cisco Catalyst SD-WAN infrastructure (Manager vs Controller/Manager/Validator) and focus on exploiting authentication/access control vulnerabilities to gain unauthorized access. Different techniques (T1068 privilege escalation via file upload vs T1562.006 defense evasion via peering bypass) but same product family and exploitation pattern.

🟡 H146.md — 72% similar
Both are privilege escalation hunts (T1068 vs CVE-2026-31431) that exploit vulnerabilities to gain root access on Linux-based systems by manipulating system files (/etc/passwd and /etc/shadow vs setuid-root binaries). Different exploitation vectors but shared goal of escalating to root privileges through file manipulation.

🟢 H190.md — 58% similar
Both focus on exploiting critical unauthenticated RCE vulnerabilities in enterprise appliances/platforms (Cisco SD-WAN Manager vs Oracle PeopleSoft) as initial compromise vectors. Different tactics (privilege escalation vs initial access) but similar pattern of zero-day exploitation against enterprise infrastructure.

Highest similarity: 85% — please review H-2026-004.md before approving.

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[theredcorsair]

we can close it as it is too similar to H-2026-004.md