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CVE-2026-20122

MEDIUMCVSS 5.4/10Actively ExploitedEPSS 7.02%

Last modified

CVE-2026-20122 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 7.02% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
5.4/10

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

EPSS Probability
7.02%

93.4th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoCatalyst Sd-Wan Manager< 20.9.8.2
CiscoCatalyst Sd-Wan Manager>= 20.10, < 20.12.5.3
CiscoCatalyst Sd-Wan Manager>= 20.13, < 20.15.4.2
CiscoCatalyst Sd-Wan Manager>= 20.16, < 20.18.2.1
CiscoCatalyst Sd-Wan Manager20.12.6

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-20122?
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&nbsp;and gain vmanage user privileges.
How severe is CVE-2026-20122?
CVE-2026-20122 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 7.02% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.
How do I fix CVE-2026-20122?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-20122?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST