CVE-2026-20122
Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability
Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
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.
CISA notes
CISA Mitigation Instructions: https://www.cisa.gov/news-events/directives/ed-26-03-mitigate-vulnerabilities-cisco-sd-wan-systems ; https://www.cisa.gov/news-events/directives/supplemental-direction-ed-26-03-hunt-and-hardening-guidance-cisco-sd-wan-systems ; https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v ; https://nvd.nist.gov/vuln/detail/CVE-2026-20122
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.
Severity
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:NExploitation Context
as of October 14, 2026- CISA added CVE-2026-20122 to the KEV catalog 54 days after its CVE record was published. The median for entries added in 2026 so far is 15 days.
- It is one of 100 Cisco entries in the CISA KEV catalog, and one of 18 added in 2026.
- Its current EPSS score (25.0%) is higher than that of 38% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Cisco | Cisco Cisco Catalyst SD-WAN Manager | 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 19.2.099 18.3.6 18.3.7 19.2.0 18.3.8 19.0.0 19.1.0 18.4.302 18.4.303 19.2.097 19.2.098 17.2.10 18.3.6.1 19.0.1a 18.2.0 18.4.3 18.4.1 17.2.8 18.3.3.1 18.4.0 18.3.1 17.2.6 17.2.9 18.3.4 17.2.5 18.3.1.1 18.3.5 18.4.0.1 18.3.3 17.2.7 17.2.4 18.3.0 19.2.3 18.4.501_ES 20.3.1 20.1.2 19.2.929 19.2.31 20.3.2 19.2.32 20.3.2_925 20.3.2.1 20.3.2.1_927 18.4.6 20.1.2_937 20.4.1 20.3.2_928 20.3.2_929 20.4.1.0.1 20.3.2.1_930 19.2.4 20.5.0.1.1 20.4.1.1 20.3.3 19.2.4.0.1 20.3.2_937 20.3.3.1 20.5.1 20.1.3 20.3.3.0.4 20.3.3.1.2 20.3.3.1.1 20.4.1.2 20.3.3.0.2 20.4.1.1.5 20.4.1.0.01 20.4.1.0.02 20.3.3.1.7 20.3.3.1.5 20.5.1.0.1 20.3.3.1.10 20.3.3.0.8 20.4.2 20.4.2.0.1 20.3.4 20.3.3.0.14 19.2.4.0.8 19.2.4.0.9 20.3.4.0.1 20.3.2.0.5 20.6.1 20.5.1.0.2 20.3.3.0.17 20.6.1.1 20.6.0.18.3 20.3.2.0.6 20.6.0.18.4 20.4.2.0.2 20.3.3.0.16 20.3.4.0.5 20.6.1.0.1 20.3.4.0.6 20.6.2 20.7.1EFT2 20.3.4.0.9 20.3.4.0.11 20.4.2.0.4 20.3.3.0.18 20.7.1 20.6.2.1 20.3.4.1 20.5.1.1 20.4.2.1 20.4.2.1.1 20.3.4.1.1 20.3.813 20.3.4.0.19 20.4.2.2.1 20.5.1.2 20.3.4.2 20.3.814 20.4.2.2 20.6.2.2 20.3.4.2.1 20.7.1.1 20.3.4.1.2 20.6.2.2.2 20.3.4.0.20 20.6.2.2.3 20.4.2.2.2 20.3.5 20.6.2.0.4 20.4.2.2.3 20.3.4.0.24 20.6.2.2.7 20.6.3 20.3.4.2.2 20.4.2.2.4 20.7.1.0.2 20.8.1 20.3.5.0.8 20.3.5.0.9 20.4.2.2.8 20.3.5.0.7 20.6.3.0.7 20.6.3.0.5 20.6.3.0.10 20.6.3.0.2 20.7.2 20.9.1EFT2 20.6.3.0.11 20.6.3.1 20.6.3.0.14 20.6.4 20.9.1 20.6.3.0.19 20.6.3.0.18 20.3.6 20.9.1.1 20.6.3.0.23 20.6.4.0.4 20.6.3.0.25 20.6.5 20.6.3.0.27 20.9.2 20.9.2.1 20.6.3.0.29 20.6.3.0.31 20.6.3.0.32 20.10.1 20.6.3.0.33 20.9.2.0.01 20.9.1_LI_Images 20.10.1_LI_Images 20.9.2_LI_Images 20.3.7 20.9.3 20.6.5.1 20.11.1 20.11.1_LI_Images 20.9.3_LI_ Images 20.6.3.1.1 20.9.3.0.2 20.6.5.1.2 20.9.3.0.3 20.4.2.3 20.6.3.2 20.6.4.1 20.6.3.0.38 20.6.3.0.39 20.3.5.1 20.3.4.3 20.9.3.1 20.3.3.2 20.6.5.2 20.3.7.1 20.10.1.1 20.6.5.2.1 20.3.4.0.25 20.6.2.2.4 20.6.1.2 20.11.1.1 20.9.3.0.5 20.3.4.0.26 20.6.5.1.3 20.6.3.0.40 20.1.3.1 20.9.2.2 20.6.5.2.3 20.6.5.1.4 20.6.5.3 20.6.3.0.41 20.9.3.0.7 20.6.5.1.5 20.9.3.0.4 20.6.4.0.19 20.6.5.1.6 20.9.3.0.8 20.6.3.3 20.3.7.2 20.6.5.4 20.6.5.1.7 20.9.3.0.12 20.6.4.2 20.6.5.5 20.9.3.2 20.11.1.2 20.6.3.4 20.10.1.2 20.6.5.1.9 20.9.3.0.16 20.6.3.0.45 20.6.5.1.10 20.9.3.0.17 20.6.5.2.4 20.6.4.0.21 20.9.3.0.18 20.6.3.0.46 20.6.3.0.47 20.9.2.3 20.9.3.2_LI_Images 20.9.3.0.21 20.9.3.0.20 20.9.4_LI_Images 20.9.4 20.6.5.1.11 20.12.1 20.12.1_LI_Images 20.6.5.1.13 20.9.3.0.23 20.6.5.2.8 20.9.4.1 20.9.4.1_LI_Images 20.9.3.0.25 20.9.3.0.24 20.6.5.1.14 20.3.8 20.6.6 20.9.3.0.26 20.6.3.0.51 20.9.3.0.29 20.12.2 20.12.2_LI_Images 20.6.6.0.1 20.13.1_LI_Images 20.9.4.0.4 20.13.1 20.9.4.1.1 20.9.5 20.9.5_LI_Images 20.12.3_LI_Images 20.12.3 20.9.4.1.3 20.6.7 20.9.5.1 20.9.5.1_LI_Images 20.9.4.1.6 20.14.1 20.14.1_LI_Images 20.9.5.2 20.9.5.2.1 20.9.5.2_LI_Images 20.12.3.1 20.12.4 20.15.1_LI_Images 20.15.1 20.9.5.1.4 20.9.5.2.7 20.9.5.2.13 20.9.6 20.9.6_LI_Images 20.9.5.2.14 20.6.8 20.12.4.0.03 20.16.1 20.16.1_LI_Images 20.12.4_LI_Images 20.9.5.2.16 20.12.4.0.4 20.12.401 20.9.5.3 20.9.5.3_LI_Images 20.12.4.1_LI_Images 20.12.4.1 20.9.5.2.21 20.9.6.0.3 20.12.4.0.6 20.15.2_LI_Images 20.15.2 20.12.4_Monthly_ES5 20.12.5 20.12.5_LI_Images 20.9.7_LI _Images 20.9.7 20.15.3 20.15.3_ LI _Images 20.12.501 20.12.5.1_LI_Images 20.12.5.1 20.12.5.2_LI_Images 20.12.5.2 20.15.3.1 20.15.4_LI_Images 20.15.4 20.9.7.1_LI _Images 20.9.7.1 20.18.1 20.18.1_LI_Images 20.12.6_LI_Images 20.12.6 20.12.5.1.01 20.9.8 20.9.8_LI_Images 20.18.2 20.15.4.1_LI_Images 20.15.4.1 20.18.2_LI_Images |
References
1 LinksRecord Details
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