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CVE-2026-20122 is an authenticated remote arbitrary file overwrite vulnerability in the API of Cisco Catalyst SD-WAN Manager. The flaw is caused by improper file handling in the API interface, allowing an attacker with valid read-only credentials and API access to upload a malicious file and overwrite arbitrary files on the local filesystem. Successful exploitation can result in privilege escalation to the vmanage user context on the affected system. The vulnerability has been reported as actively exploited in the wild.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
99 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Cisco SD-WAN vulnerability mentioned as one of several other vulnerabilities discovered this year.
A Cisco SD-WAN vulnerability listed by the article as having detected exploitation in 2026.
A previously flagged actively exploited Cisco SD-WAN vulnerability referenced for context only.
An arbitrary file overwrite vulnerability in Cisco Catalyst SD-WAN Manager that the article says attackers have been exploiting as a zero- or n-day.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.