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CVE-2026-20122

Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs

5.4 MEDIUMActively exploited (CISA KEV)EPSS 25.0%
  1. Published25 Feb 2026
  2. Added to CISA KEV20 Apr 2026
  3. Remediation due23 Apr 2026
Actively exploited (CISA KEV)

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.

Added to KEV: 20 Apr 2026Federal remediation due: 23 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected products

Cisco Catalyst SD-WAN Manager≥ 20.10 < 20.12.5.3 · ≥ 20.13 < 20.15.4.2 · ≥ 20.16 < 20.18.2.1 · < 20.9.8.2

Remediation

Fixed in
Cisco Catalyst SD-WAN Manager≥ 20.12.5.3

References

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Frequently asked

Is CVE-2026-20122 being actively exploited?

Yes. CVE-2026-20122 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 20 Apr 2026.

How severe is CVE-2026-20122?

CVE-2026-20122 has a CVSS 3.1 base score of 5.4, rated medium. EPSS estimates a 25.0% probability of exploitation.

Which products are affected by CVE-2026-20122?

Affected products include Cisco Catalyst SD-WAN Manager.

How do I fix CVE-2026-20122?

Upgrade affected software to a fixed version, for example Cisco Catalyst SD-WAN Manager 20.12.5.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-20122 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.