What it is
CVE-2026-20122 is Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability. A vulnerability in the API of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to overwrite arbitrary...
Vulnerability report
Exploited in the wild
Confirmed confidence
In CISA KEV
CVE-2026-20122
Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability
Cisco / Cisco Catalyst SD-WAN Manager · 20.1.12
- Severity
- CVSS 5.4 · Medium
- Confidence
- Confirmed
- Exploit status
- Exploited in the wild
- EPSS
- 24.6%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.
Who is affected?
Cisco / Cisco Catalyst SD-WAN Manager 20.1.12.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability
A vulnerability in the API of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to overwrite arbitrary files on the local file system. To exploit this vulnerability, the attacker must have valid read-only credentials with API access on the affected system.
This vulnerability is due to improper file handling on the API interface of an affected system. An attacker could exploit this vulnerability by uploading a malicious file on the local file system. A successful exploit could allow the attacker to overwrite arbitrary files on the affected system and gain vmanage user privileges.
Vendor
Product
Affected
Status
Cisco
Cisco Catalyst SD-WAN Manager
20.3.4.0.20
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.2.2.3
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.4.2.2.2
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.3.5
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.2.0.4
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.4.2.2.3
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.3.4.0.24
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.2.2.7
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.3
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.3.4.2.2
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.4.2.2.4
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.7.1.0.2
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.8.1
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.3.5.0.8
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.3.5.0.9
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.4.2.2.8
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.3.5.0.7
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.3.0.7
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.3.0.5
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.3.0.10
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.3.0.2
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.7.2
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.9.1EFT2
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.3.0.11
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.3.1
Affected
- Published
- 25 Feb 2026
- Exploitation Reported
- 01 Jun 2026
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
Tags
cisa
edge
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-20122
- cisco-sa-sdwan-authbp-qwCX8D4v sec.cloudapps.cisco.com · CVE Record https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurity...
Exploitation evidence
Why KEV Intelligence marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
CVE
Independent exploitation attestation added to the KEV Intelligence record.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CVE First | 2026-06-01 13:22 UTC |
| CISA | 2026-06-02 14:01 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
5.4
Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
EPSS
24.6%
Weaknesses
Timeline
From disclosure to observed exploitation
-
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
Added to KEV Intelligence KEV Feed
High-confidence, third-party attested exploitation
-
CVE published
Vulnerability disclosed publicly
-
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2026-20122
Free JSON includes basic KEV fields{
"cve_id": "CVE-2026-20122",
"confidence": "Confirmed",
"cvss_score": 5.4,
"cvss_estimated": false,
"epss_score": 0.24585,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}Early warning alerts
Get alerts on high-impact exploitation
Receive curator-selected alerts when exploitation activity warrants attention. Each alert includes the evidence and context needed to decide what requires attention now.