Vulnerability

CVE-2026-20128

High· 7.5KEVCVSS7.5EPSS0%

.rules3/5

Cisco Catalyst SD-WAN Manager Storing Passwords in a Recoverable Format Vulnerability

Cisco Catalyst SD-WAN Manager contains a storing passwords in a recoverable format vulnerability that allows an authenticated, local attacker to gain DCA user privileges by accessing a credential file for the DCA user on the filesystem as a low-privileged user.

Threat signal

85/100

High

Severity

high

CVSS

7.5

EPSS

Active

KEV

CISA KEV — actively exploited

51d overdue

AffectedCisco — Catalyst SD-WAN Manager

Added to KEV

2026-04-20

Federal patch due (BOD 22-01)

2026-04-23

Required action (CISA verbatim)

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.

Vendor advisory + references

CISA description: “Cisco Catalyst SD-WAN Manager contains a storing passwords in a recoverable format vulnerability that allows an authenticated, local attacker to gain DCA user privileges by accessing a credential file for the DCA user on the filesystem as a low-privileged user.”

CVSS

v3.1Open in FIRST calculator →

7.5/ 10HIGHCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack VectorLocalRequires local access — shell, console, or local app.
Attack ComplexityHighRequires conditions outside attacker's control (race, brute-force, configuration
Privileges RequiredHighAdmin / root privileges required.
User InteractionNoneFully automated — no victim action needed.
ScopeChangedImpact extends beyond the vulnerable component (e.g. sandbox escape).
Confidentiality ImpactHighTotal disclosure of sensitive data.
Integrity ImpactHighTotal compromise of integrity — full data modification possible.
Availability ImpactHighTotal loss of availability — full DoS possible.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

0.08%

probability of exploitation in next 30 days

p23

higher than 23% of all CVEs

3-day trend↑ 0pp

Low exploitation likelihood — defer if no other signals fire.

Vendor VEX

No VEX statements published for CVE-2026-20128. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCAct

Active exploitation with total impact on essential/support systems

exploitation: active
automatable: no
impact: total
mission: support

Lifecycle

2026-04-20Added to CISA KEVransomware: Unknown
2026-04-20Published
2026-04-23Federal patch due (BOD 22-01)
2026-06-12Last modified1 source

Mentions in news & research

research:talosOngoing exploitation of Cisco Catalyst SD-WAN vulnerabilities2026-05-14

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.