Exploited CVEs / Cisco / CVE-2026-20128
CVE-2026-20128
Cisco Catalyst SD-WAN Manager Storing Passwords in a Recoverable Format Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2026-04-23 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Cisco Security Advisories (PSIRT), linked below.
Actively exploited Cisco Catalyst SD-WAN Manager vulnerability, High severity, CVSS 7.5. Added to the CISA KEV catalog 2026-04-20.
Risk summary
Updated July 26, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2026-20128
Cisco Catalyst SD-WAN Manager stores the DCA user's credentials in a recoverable format on the filesystem, readable by a low-privileged local user, a High Severity CVSS 7.5 flaw confirmed exploited since 2026-04-20. It converts any minor foothold on the appliance into DCA-level privileges. Combined with the file-upload and disclosure bugs added to the KEV catalog the same day, it completes a practical escalation path.
Do this: Patch SD-WAN Manager, then rotate the DCA credentials since the file may already have been read.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-20128
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2026-20128
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal (BOD 22-01) remediation due date: 2026-04-23 (past due).
Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s “Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
Official fix for CVE-2026-20128
The authoritative fix and affected-version list are published by the vendor. Find the Catalyst SD-WAN Manager advisory on Cisco Security Advisories (PSIRT).
Common questions about CVE-2026-20128
Is CVE-2026-20128 actively exploited?
Yes. CVE-2026-20128 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2026-04-20, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 6.9%.
What is the CISA deadline and required action for CVE-2026-20128?
CISA set the federal (BOD 22-01) remediation due date at 2026-04-23, which has passed; treat any unremediated system as overdue. The verbatim required action: Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s “Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
What fixes CVE-2026-20128?
The authoritative fix is in the vendor advisory: see Cisco Security Advisories (PSIRT) for the patched Catalyst SD-WAN Manager versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2026-20128?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-20128's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
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