Threats / Cisco / CVE-2026-20128
CVE-2026-20128
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
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.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
12 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 0.046 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Cisco, Catalyst SD-WAN Manager. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-257 CWE-257.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
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