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.

Risk summary

HighCISA KEV
7.5
CVSS v3 base
6.9%
EPSS exploit probability
High
Severity
2026-04-20
Added to KEV
2026-04-23 (past due)
CISA due date

Actively exploited Cisco Catalyst SD-WAN Manager vulnerability, High severity, CVSS v3 7.5. Added to the CISA KEV catalog 2026-04-20.

Senserva AI read on CVE-2026-20128CISA required actionOfficial fix for CVE-2026-20128Admin questions

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.

Patch now
Exploited in the wild: confirmed by the CISA KEV catalog, not predicted.
The fix ships from the vendor: Cisco Security Advisories (PSIRT).
Do this now: Federal remediation deadline 2026-04-23; treat it as your outer bound. Patch now and verify deployment on every exposed device.

Updated September 3, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.

Full tracking and change history for CVE-2026-20128

Published
2026-04-20
Last revised
2026-04-20
Changes tracked
1

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.

Senserva Watchevery change we have recorded for this one
What changed, and when
  • 2026-04-20 added to the CISA KEV catalog by CISA
  • 2026-07-17 CVSS 0.0 to 7.5; EPSS first scored at 5.3%
  • 2026-07-24 EPSS 5.3% to 6.9%

Recorded by Senserva on the dates shown, from CISA KEV and FIRST EPSS. This is what moved and when, which neither the vendor advisory nor NVD publishes.

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).

Cisco Security Advisories (PSIRT)CISA KEV entry

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 once a day (early morning US Central).

Scope and sources

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Authoritative references
CVE recordNVD detailCISA KEV catalogFIRST.org EPSS

Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
Provided as is, without warranty; verify against the vendor advisory before acting. Data notice and terms.