Actively exploited · Published Feb 25, 2026 · Assigned by cisco
CVE-2026-20122Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability
Medium 5.4 Exploited
In plain English
A medium-severity security flaw in Cisco Catalyst SD-WAN Manager from Cisco. Attackers are actively exploiting it in the wild (listed by CISA on April 20, 2026). The chance it is exploited in the next 30 days is estimated at 25.8% (higher than 98% of all known vulnerabilities). 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.
CISA guidance
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.
Federal agencies must remediate by Apr 23, 2026.
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco Catalyst SD-WAN Manager | 20.1.1219.2.118.4.418.4.520.1.1.120.1.119.3.019.2.2 |
Weakness: CWE-648 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N