[Update] Vulnerability in Cisco Catalyst SD-WAN (February 25, 2026)
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
A vulnerability has been discovered in Cisco Catalyst SD-WAN. It allows an attacker to bypass security policy. Cisco states that the vulnerability CVE-2026-20127 is actively being exploited.
CSIRTS triage
- What
- A vulnerability allows an attacker to bypass security policy.
- Who is affected
- Users of Cisco Catalyst SD-WAN.
- Urgency
- Remediation is critical as the vulnerability is actively being exploited.
- Action
- Implement recommended security measures and apply updates.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://www.cert.ssi.gouv.fr/alerte/CERTFR-2026-ALE-002/
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2026-20127Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-20127 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- criticalexploitedCisco Catalyst SD-WAN Controller Authentication Bypass Vulnerabilitycisco-psirt
- unknownexploitedCisco Catalyst SD-WAN Controller, Catalyst SD-WAN Manager, and Catalyst SD-WAN Validator Authenticated Privile…cisco-psirt
- criticalexploited2026-002: Multiple Vulnerabilities in Cisco Productscert-eu
- criticalexploitedCVE-2026-20127: Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass Vulnerabilitycisa-kev
Recent advisories for Cisco Catalyst SD-WAN
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- criticalexploitedCisco Catalyst SD-WAN Controller Authentication Bypass Vulnerabilitycisco-psirt · 2026-06-16
- highexploitedCisco Catalyst SD-WAN Controller Authentication Bypass Vulnerabilitycisco-psirt · 2026-06-16
- unknownNCSC-2026-0199 [1.00] [M/H] Vulnerability fixed in Cisco Catalyst SD-WAN Managerncsc-nl · 2026-06-16
- mediumexploitedCisco Catalyst SD-WAN Manager Arbitrary File Write Vulnerabilitycisco-psirt · 2026-06-15
- criticalexploitedCVE-2026-20262: Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerabilitycisa-kev · 2026-06-15
- unknownexploitedCisco Catalyst SD-WAN Controller, Catalyst SD-WAN Manager, and Catalyst SD-WAN Validator Authenticated Privile…cisco-psirt · 2026-06-12
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