CVE Intelligence
CISA KEV High

CVE-2026-20128 — Cisco Catalyst SD-WAN Manager Storing Passwords in a Recoverable Format Vulnerability

A vulnerability in the Data Collection Agent (DCA) feature of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to gain DCA user privileges on an affected system. This vulnerability is due to the presence of a credential file for the DCA user on an affected system. An attacker could exploit this vulnerability by sending a crafted HTTP request and reading the file that contains the DCA password from that affected system. A successful exploit could allow the attacker to access another affected system and gain DCA user privileges. Note: Cisco Catalyst SD-WAN Manager releases 20.18 and later are not affected by this vulnerability.

Published Feb 25, 2026 · Updated Oct 13, 2026 · Sources: CISA Known Exploited Vulnerabilities, NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: cisco

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

CISA KEV · Apr 20, 2026
How the score was calculated
  • Confirmed exploitation (CISA KEV)+35
  • EPSS 7.2% (30-day exploitation probability)+14
  • Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Confirmed
CISA KEV, listed Apr 20, 2026
EPSS FIRST
7.22%
ahead of 94% of scored CVEs · Oct 14, 2026
Affects
Cisco
Catalyst Sd-wan Manager
CVSS base
7.5
High · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
Active
none · proof-of-concept · active
Automatable
No
can an attacker script the kill-chain steps
Technical impact
Total
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

CISA required action CISA

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.

US federal deadline: Apr 23, 2026 — passed 175 day(s) ago

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Cisco Catalyst Sd-wan Manager).
  2. Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
  3. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
  4. EPSS ahead of 94% of scored CVEs: prioritize it in the patch queue.
  5. Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Cisco Catalyst Sd-wan Manager version 20.3.5.1version 26.1.1version 20.12.501version 20.3.8version 20.6.5.1.4version 20.1.3.1version 20.6.1.2version 20.6.2.2.4
and 128 more version 20.3.4.0.25version 20.3.7.1version 20.3.3.2version 20.3.4.3version 20.3.4.0.24version 20.4.2.3version 20.3.7version 20.3.6version 20.9.1EFT2version 20.6.3.0.2version 20.3.5.0.7version 20.3.5.0.9version 20.3.5.0.8version 20.4.2.2.4version 20.3.4.2.2version 20.6.2.2.7version 20.1.12version 19.2.1version 18.4.4version 18.4.5version 20.1.1.1version 20.1.1version 19.3.0version 19.2.2version 19.2.099version 18.3.6version 18.3.7version 19.2.0version 18.3.8version 19.0.0version 19.1.0version 18.4.302version 18.4.303version 19.2.097version 19.2.098version 17.2.10version 18.3.6.1version 19.0.1aversion 18.2.0version 18.4.3version 18.4.1version 17.2.8version 18.3.3.1version 18.4.0version 18.3.1version 17.2.6version 17.2.9version 18.3.4version 17.2.5version 18.3.1.1version 18.3.5version 18.4.0.1version 18.3.3version 17.2.7version 18.3.0version 19.2.3version 18.4.501_ESversion 20.3.1version 20.1.2version 19.2.929version 19.2.31version 20.3.2version 19.2.32version 20.3.2.1version 20.3.2.1_927version 18.4.6version 20.3.2_928version 20.3.2_929version 20.4.1.0.1version 20.3.2.1_930version 19.2.4version 20.5.0.1.1version 20.4.1.1version 20.3.3version 19.2.4.0.1version 20.3.2_937version 20.5.1version 20.1.3version 20.3.3.0.4version 20.3.3.1.2version 20.3.3.1.1version 20.4.1.2version 20.3.3.0.2version 20.4.1.1.5version 20.4.1.0.02version 20.3.3.1.7version 20.3.3.1.5version 20.5.1.0.1version 20.3.3.1.10version 20.3.3.0.8version 20.4.2version 20.3.4version 20.3.3.0.14version 19.2.4.0.8version 19.2.4.0.9version 20.3.4.0.1version 20.3.2.0.5version 20.5.1.0.2version 20.6.1.1version 20.6.0.18.3version 20.3.2.0.6version 20.6.0.18.4version 20.4.2.0.2version 20.3.3.0.16version 20.6.1.0.1version 20.3.4.0.6version 20.7.1EFT2version 20.3.4.0.9version 20.3.4.0.11version 20.3.3.0.18version 20.6.2.1version 20.3.4.1version 20.4.2.1version 20.4.2.1.1version 20.3.4.1.1version 20.3.813version 20.3.4.0.19version 20.4.2.2.1version 20.5.1.2version 20.3.814version 20.4.2.2version 20.6.2.2version 20.3.4.2.1version 20.3.4.1.2version 20.3.4.0.20version 20.6.2.2.3version 20.4.2.2.2version 20.6.2.0.4
Vulnerable CVE Program (cve.org) e CISA ADP
Cisco Catalyst Sd-wan Manager < 20.9.8.2≥ 20.10 and < 20.12.5.3≥ 20.13 and < 20.15.4.2≥ 20.16 and < 20.18version 20.12.6 Vulnerable NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Local
Attack complexity
High
Privileges required
High
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
7.5 CVSS 3.1 High 0.8 6.0 psirt@cisco.com via NIST National Vulnerability Database
7.5 CVSS 3.1 High — — GitHub, Inc. via GitHub Security Advisories
7.5 CVSS 3.1 High — — cisco via CVE Program (cve.org) e CISA ADP
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H (score shown at the top: psirt@cisco.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-257

Other CVEs with this weakness →

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

Listed
Apr 20, 2026
Federal deadline
Apr 23, 2026
passed 175 day(s) ago
Ransomware use
Unknown

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.

EPSS over time FIRST

Oct 12, 2026 → Oct 14, 2026 · 3 reading(s) · max 7.22%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
  • Hunt retroactively in logs from before Apr 20, 2026 (KEV listing): exploitation may have started earlier.
endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

  • 2026
  • Affected products added · cisco/cisco catalyst sd-wan manager
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • SSVC assessment updated
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 13, 2026
  • Affected products added · cisco/catalyst sd-wan manager
    Oct 13, 2026 · NIST National Vulnerability Database
  • CVSS changed · 7.5
    Oct 13, 2026 · NIST National Vulnerability Database
  • Source status changed · → Analyzed
    Oct 13, 2026 · NIST National Vulnerability Database
  • Added to CISA KEV (detected)
    Oct 13, 2026 · CISA Known Exploited Vulnerabilities
  • Record created in this database
    Oct 13, 2026 · CISA Known Exploited Vulnerabilities
  • Added to CISA KEV catalog
    Apr 19, 2026 · CISA
  • CVE published
    Feb 25, 2026 · cisco

Source activity

Repeated readings are counted rather than listed.

  • 2× References added · Oct 13, 2026 – Oct 13, 2026
  • 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

4 on the record

Elsewhere on this site

Cisco
every CVE for this vendor
2026-04
what else CISA listed that month
CWE-257
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-76504 Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability KEV 15d
  • CVE-2026-20262 Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerability KEV Jun 15, 2026
  • CVE-2026-20245 Cisco Catalyst SD-WAN Manager Improper Encoding or Escaping of Output Vulnerability KEV Jun 4, 2026
  • CVE-2026-20224 Cisco Catalyst SD-WAN Manager XML External Entity Injection Vulnerability May 14, 2026
  • CVE-2026-20210 Cisco Catalyst SD-WAN Manager Privilege Escalation Vulnerability May 14, 2026
  • CVE-2026-20209 Cisco Catalyst SD-WAN Manager Privilege Escalation Vulnerability May 14, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No fixed version, patch or mitigation documented.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-20128 is "Cisco Catalyst SD-WAN Manager Storing Passwords in a Recoverable Format Vulnerability", rated High. It affects Catalyst Sd-wan Manager (Cisco); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 7.5 describes technical severity. EPSS 7.22% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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