CVE-2026-20122Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability
Updated under an hour ago ()
Does this affect you?
It affects Cisco Catalyst SD-WAN Manager and 1 other product. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Apr 20, 2026; federal agencies had to remediate by Apr 23, 2026. Treat that date as your deadline.
Do this next
Free account, 1 product
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.
- CVSS
- 5.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- Weakness (CWE)
- CWE-648
- Known exploited
- Added to CISA KEV Apr 20, 2026; federal remediation due Apr 23, 2026Please 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.
- EPSS (exploitation in the next 30 days)
- 25.48% (percentile 98)
- Assigned by
- cisco
- NVD analysis
- Analyzed
- Record last updated
- Apr 21, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Cisco Cisco Catalyst SD-WAN Manager cisco:catalyst_sd_wan_manager (from the name) | 20.1.12; 19.2.1; 18.4.4; 18.4.5; 20.1.1.1; 20.1.1; 19.3.0; 19.2.2; and 193 more ranges | CNA record |
cisco catalyst_sd-wan_manager cisco:catalyst_sd-wan_manager | before 20.9.8.2; from 20.10 before 20.12.5.3; from 20.13 before 20.15.4.2; from 20.16 before 20.18.2.1; 20.12.6 | NVD |
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4vvendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20122us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.