Threats / Cisco / CVE-2026-20128
CVE-2026-20128
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Cisco Catalyst SD-WAN Manager vulnerability
Cisco Catalyst SD-WAN Manager stores passwords in recoverable format, allowing authenticated local attackers to extract DCA credentials from the filesystem and escalate privileges.
Verdict
Today item — known-exploited.
An authenticated local attacker with low privileges can read a credential file on the filesystem to recover DCA user passwords in plaintext or easily reversible format, enabling privilege escalation to DCA administrative access.
CISA KEV Yes · 2026-04-205EPSS 0.06943 (verify live)6CVSS 7.53CISA SSVC Exploitation: active · Automatable: no · Impact: total4
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
13 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-04-20).
Probability (EPSS)
EPSS 0.06943 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 7.5 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H) · Affected: Cisco, Catalyst SD-WAN Manager. Confirm exact fixed builds in the vendor advisory.CVSS — CNA-assigned (CVE.org), version 3.1, set at disclosure.
Weakness (CWE)
Mapped to CWE-257 CWE-257.CWE — CNA-assigned (CVE.org); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: no · Technical Impact: totalCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 54 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
WeaknessCWE-257 · CWE-257
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I gain initial access as a low-privileged local user on the SD-WAN Manager system.
Business
An insider or compromised account exists within the organization with local system access.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I locate and read the credential file storing DCA user passwords in recoverable format.
Business
Weak credential storage practices expose sensitive authentication material to local file access.
3
Lateral reach — past segmentation narrative 3
Attacker
I recover the DCA password and authenticate as a DCA administrative user.
Business
Privilege escalation compromises the integrity and availability of SD-WAN infrastructure management.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05