CVE-2026-20122
MEDIUMCISA KEVEPSS 98th pctlDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Exploit Intelligence
Very high risk: more likely to be exploited than 98% of all known CVEs.
Remediation due: 2026-04-23
References
Related Vulnerabilities
Other CWE-648 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2019-14813 | Critical | 9.8 | 11% | - | Fix |
| CVE-2024-8785 | Critical | 9.8 | 9.7% | - | Fix |
| CVE-2025-54766 | Medium | 5.3 | 6.9% | - | - |
| CVE-2025-54765 | Medium | 5.3 | 6.9% | - | - |
| CVE-2025-54767 | Medium | 6.5 | 5.3% | - | - |
| CVE-2019-1010178 | Critical | 9.8 | 4.6% | - | - |
Common questions
How do I fix CVE-2026-20122?
Upgrade catalyst sd-wan manager to 20.18.2.1 or later.
Is CVE-2026-20122 being actively exploited?
Yes. CVE-2026-20122 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2026-04-23. Treat it as a priority whatever its CVSS score says.
How severe is CVE-2026-20122?
CVE-2026-20122 has a CVSS v3 base score of 5.4, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-20122 affect?
Published advisories record a fix for catalyst sd-wan manager (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-21.