CVE-2026-20122
Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Description
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.
Official description from the CVE record, published by cisco. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org
Key data
CVSS 3.1 Medium 5.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector: Network
The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity: Low
No special conditions are needed. The attack can be repeated at will.
Privileges required: Low
A basic user account is needed.
User interaction: None
No action from any user is needed.
Scope: Unchanged
The impact stays within the vulnerable component.
Confidentiality impact: Low
Limited effect on the secrecy of data.
Integrity impact: Low
Limited effect on the trustworthiness of data.
Availability impact: None
No effect on availability.
| Metric | Value | What it means |
|---|---|---|
| Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. |
| Attack complexity | Low | No special conditions are needed. The attack can be repeated at will. |
| Privileges required | Low | A basic user account is needed. |
| User interaction | None | No action from any user is needed. |
| Scope | Unchanged | The impact stays within the vulnerable component. |
| Confidentiality impact | Low | Limited effect on the secrecy of data. |
| Integrity impact | Low | Limited effect on the trustworthiness of data. |
| Availability impact | None | No effect on availability. |
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EPSS
- Score
- 0.25801 (25.8% probability)
- Percentile
- 98.0%
- Scores of
- Nov 10, 2026
- Model
- v2026.06.15
CISA Known Exploited Vulnerabilities
- Name in the catalog
- Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerability
- Added to the catalog
- Apr 20, 2026
- Federal due date
- Apr 23, 2026
CISA assessment as of Mar 5, 2026
- Exploitation
- Recorded by CISA as active
- Automatable
- no
- Technical impact
- total
Weakness (CWE)
- CWE-648Incorrect Use of Privileged APIs
Affected products
Cisco Catalyst SD-WAN Manager
- affected: 20.1.12
- affected: 19.2.1
- affected: 18.4.4
- affected: 18.4.5
- affected: 20.1.1.1
- affected: 20.1.1
- affected: 19.3.0
- affected: 19.2.2
- affected: 19.2.099
- affected: 18.3.6
- affected: 18.3.7
- affected: 19.2.0
- affected: 18.3.8
- affected: 19.0.0
- affected: 19.1.0
- affected: 18.4.302
- affected: 18.4.303
- affected: 19.2.097
- affected: 19.2.098
- affected: 17.2.10
- affected: 18.3.6.1
- affected: 19.0.1a
- affected: 18.2.0
- affected: 18.4.3
- affected: 18.4.1
- and 310 more
References
- cisco-sa-sdwan-authbp-qwCX8D4v (sec.cloudapps.cisco.com)
Timeline
- ID reserved
- Record published
- Added to CISA KEV
- Record last updated
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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:47 UTC. Sources and licenses