CVEs / CVE-2026-20122
CVE-2026-20122: Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerability
- Known exploited in the CISA KEV catalog since 20 Apr 2026
- medium 5.4 CVSS 3.1 (NVD)
- EPSS 25.8% chance of exploitation in the next 30 days, higher than 97% of CVEs (30 Oct 2026)
- Last changed at its sources
Are you affected? Check your servers with Stackurity: it lists the software on each server and the vulnerabilities to fix first.
Check your servers with Stackurity Already using Stackurity? Search for CVE-2026-20122
Summary
Cisco Catalyst SD-WAN Manager contains an incorrect use of privileged APIs vulnerability 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.
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 and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Cisco Cisco Catalyst SD-WAN Manager | 20.1.12 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.2.1 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.4.4 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.4.5 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 20.1.1.1 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 20.1.1 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.3.0 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.2.2 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.2.099 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.3.6 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.3.7 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.2.0 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.3.8 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.0.0 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.1.0 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.4.302 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.4.303 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.2.097 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.2.098 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 17.2.10 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.3.6.1 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.0.1a | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.2.0 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.4.3 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.4.1 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 17.2.8 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.3.3.1 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.4.0 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.3.1 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 17.2.6 | — |
Exploitation
| In CISA KEV since | 20 Apr 2026 |
|---|---|
| Due date for US federal agencies | 23 Apr 2026 |
| Used in ransomware campaigns | Unknown |
| Required action | 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. |
Severity
| CVSS 3.1 | 5.4 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:NScored by NVD |
|---|---|
| Weakness | CWE-648 |
References
- CVE-2026-20122 on NVD
- CVE-2026-20122 in the CISA KEV catalog
- https://www.cisa.gov/news-events/directives/ed-26-03-mitigate-vulnerabilities-cisco-sd-wan-systems (cited by CISA)
- https://www.cisa.gov/news-events/directives/supplemental-direction-ed-26-03-hunt-and-hardening-guidance-cisco-sd-wan-systems (cited by CISA)
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v (cited by CISA)
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20122 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.