Medium severity · published Feb 25, 2026
CVE-2026-20122
Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability
In wildKEV
5.4
CVSS
25.8%
EPSS
Yes
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)25.8% · higher than 98% of CVEs
Exploited in the wildYes
CISA KEVListed Apr 20, 2026
Federal remediation dueApr 23, 2026
Ransomware campaign useNot known
Affected products
Which versions
CC
Cisco Catalyst SD-WAN Manager · Cisco
20.1.12; 19.2.1; 18.4.4; 18.4.5; 20.1.1.1; 20.1.1; +34 more · source: vendor
CS
Catalyst Sd-wan Manager · Cisco
before 20.9.8.2; 20.10 before 20.12.5.3; 20.13 before 20.15.4.2; 20.16 before 20.18.2.1; 20.12.6 · source: NVD
CS
Catalyst SD-WAN Manger · Cisco
All versions, or not specified · source: KEV
In the news
AdvisoryHigh
CISA Adds Eight Known Exploited Vulnerabilities to Catalog
CISA has added eight new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation.  CVE-2023-27351 PaperCut NG/MF Improper Authentication Vulnerability CVE-2024-27199 JetBrains TeamCity Relative Path Traversal Vulnerability CVE-2025-2749 Kentico Xperience Path Traversal Vulnerability CVE-2025-32975 Quest KACE Systems Management Appliance (SMA) Improper Authentication Vulnerability CVE-2025-48700 Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability CVE-2026-20122 Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerability CVE-2026-20128 Cisco Catalyst SD-WAN Manager Storing Passwords in a Recoverable Format Vulnerability CVE-2026-20133 Cisco Catalyst SD-WAN Manager Exposure of Sensitive Information to an Unauthorized Actor Vulnerability These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significant risks to the federal enterprise.  Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the KEV Catalog as a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate identified vulnerabilities by the due date to protect FCEB networks against active threats. Se...
Apr 20, 2026·CISA Advisories
VulnerabilityHigh
[CISA KEV] CVE-2026-20122: Cisco Catalyst SD-WAN Manger - 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. A successful exploit could allow the attacker to overwrite arbitrary files on the affected system and gain vmanage user privileges.
CSCatalyst SD-WAN MangerCVE-2026-20122
Apr 20, 2026·CISA KEV
VulnerabilityCritical
Cisco flags ongoing exploitation of two recently patched Catalyst SD-WAN flaws
Cisco warns that two recently patched Catalyst SD-WAN flaws, CVE-2026-20128 and CVE-2026-20122, are already being actively exploited in the wild. Cisco warned customers that threat actors are actively exploiting two recently patched Catalyst SD-WAN vulnerabilities, CVE-2026-20128 and CVE-2026-20122. The networking giant urged organizations to apply the latest security updates to reduce the risk of compromise. […]
Mar 6, 2026·Security Affairs
VulnerabilityHigh
Cisco Confirms Active Exploitation of Two Catalyst SD-WAN Manager Vulnerabilities
Cisco has disclosed that two more vulnerabilities affecting Catalyst SD-WAN Manager (formerly SD-WAN vManage) have come under active exploitation in the wild. The vulnerabilities in question are listed below - CVE-2026-20122 (CVSS score: 7.1) - An arbitrary file overwrite vulnerability that could allow an authenticated, remote attacker to overwrite arbitrary files on the local file system.
Mar 5, 2026·The Hacker News
VulnerabilityHigh
Cisco warns of SD-WAN Manager exploitation, fixes 48 firewall vulnerabilities
Cisco has confirmed that two Catalyst SD-WAN Manager vulnerabilities (CVE-2026-20128 and CVE-2026-20122) patched in late February 2025 are being exploited by attackers. The exploited vulnerabilities (CVE-2026-20128, CVE-2026-20122) CVE-2026-20128 is a bug in the Data Collection Agent (DCA) feature of Cisco Catalyst SD-WAN Manager, which could allow an authenticated, local attacker to gain DCA user privileges on an affected system. “To exploit this vulnerability, the attacker must have valid vmanage credentials on the affected system,” Cisco … More → The post Cisco warns of SD-WAN Manager exploitation, fixes 48 firewall vulnerabilities appeared first on Help Net Security .
Mar 5, 2026·Help Net Security
Affected product
CC
Cisco Catalyst SD-WAN Manager
Cisco
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