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Response snapshot Oct 27, 2026, 03:17 UTC

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VulnerabilityCVE-2026-20122Known exploitation

Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerability

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.

At a glance

Exploited
Yes: on CISA's Known Exploited list
Severity
5.4 Medium (CVSS 3.1)
Chance of exploitation
25.8% in the next 30 days
CISA federal deadline
Apr 23, 2026: passed
Sources
2 independent sources

What to do

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.

Read CISA KEV entry CVE-2026-20122 (opens a new tab)

What happened

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.

CISA federal deadline

Federal due date passed

Applies to covered US federal agencies; it is not your organization's deadline.

Added to the catalog Known ransomware use: Unknown
CISA catalog (opens a new tab)

Scores and how they were measured

CVSS base severity

5.4

Version 3.1As of

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

25.8%

Scored Percentile 98.0%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    CISA KEV entry CVE-2026-20122 (opens a new tab)

    The CVE-2026-20122 catalog entry establishes known exploitation, date added, required action, and the federal due date; not zero-day status.

    Published Checked

  2. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-20122, scored 2026-10-26. This is a model estimate, not proof of exposure.

    Published Checked

  3. Primary source

    CVE Program CNA cisco (opens a new tab)

    The published CVE-2026-20122 document's CNA supplies this CVSS 3.1 base score, vector, and authoritative source update date.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, April 20). Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerability (CVE-2026-20122). https://kevwire.com/record/CVE-2026-20122

MLA

"Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerability (CVE-2026-20122)." KEVWire, 20 Apr. 2026, kevwire.com/record/CVE-2026-20122.

Chicago

KEVWire. "Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerability (CVE-2026-20122)." Last modified April 20, 2026. https://kevwire.com/record/CVE-2026-20122.

Evidence summary (plain text)

Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerability (Apr 20, 2026).
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.
CVSS 5.4 (version 3.1; evidence as of Mar 20, 2026; https://cveawg.mitre.org/api/cve/CVE-2026-20122).
EPSS 25.8% for the following 30 days, scored Oct 26, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-20122&date=2026-10-26).
Sources:
CISA KEV entry CVE-2026-20122: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-20122&date=2026-10-26
CVE Program CNA cisco: https://cveawg.mitre.org/api/cve/CVE-2026-20122
Record ID: CVE-2026-20122.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Documented by a cited source.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
CISA federal due date: Apr 23, 2026. This is a deadline for covered US federal agencies, not the reader's SLA.
About this data

This record was ingested from a data source. Retrieved: Oct 27, 2026, 01:40 UTC. Ingestion is not an independent editorial investigation.

CISA added this entry on 2026-04-20. This record's publication date is the catalog addition date, not necessarily the initial vulnerability disclosure. KEV means known exploitation, not necessarily a zero-day. CISA due dates apply to covered US federal agencies, not your organizational SLA.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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