Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability
Affects Cisco Catalyst SD-WAN Manager regardless of device configuration, and requires valid read-only API credentials. Cisco has released software updates that address it.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Cisco Catalyst SD-WAN Manager is affected by a flaw in its API that lets an attacker who has valid read-only API credentials overwrite arbitrary files on the system. A successful attack could let the attacker gain vmanage user privileges on the affected management software.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original 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.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- Record last updated
- CISA remediation deadline
Due date for US federal agencies to patch
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- 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, and 305 more
References 1
sec.cloudapps.cisco.com
Questions about CVE-2026-20122
What does this mean?
A remote attacker who is authenticated can overwrite arbitrary files on the affected system's local file system and gain vmanage user privileges.Source: sec.cloudapps.cisco.com
What should I do about it?
Install the software update that Cisco has released for this vulnerability. The checked facts do not name the fixed version, so take that from Cisco's advisory.Source: sec.cloudapps.cisco.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-04-20, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data
What if there's no patch?
No workarounds are available for this vulnerability. The checked facts do not describe any other mitigation to use until a fix is installed.Source: sec.cloudapps.cisco.com