CVE-2026-20122
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network with a low-privilege account. Limited direct impact.
- In the wild
- CISA lists this as exploited in real attacks. Treat as urgent.
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- ReservedThe CVE id was reserved by its CNA
- PublishedDisclosed publicly on CVE.org and NVD
- 2026-04-20 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
- 2026-04-23 Remediation deadlineCISA's due date for federal agencies to fix it
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
- Exploit odds: 25.8% in the next 30 days (EPSS).
- Severity: 5.4 MEDIUM (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Added to CISA KEV
- 2026-04-20
- Exploit probability
- 25.8% · EPSS, next 30 days
- Weakness
- CWE-648
- Record status
- Analyzed
Affected
- Cisco Catalyst sd-wan Manager < 20.9.8.2
- Cisco Catalyst sd-wan Manager < 20.12.5.3
- Cisco Catalyst sd-wan Manager < 20.15.4.2
- Cisco Catalyst sd-wan Manager < 20.18.2.1
- Cisco Catalyst sd-wan Manager 20.12.6
Attack profile CVSS 3.1 · 5.4
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Raw vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2026-20122.md and follow it. Check whether this project is affected by CVE-2026-20122. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
