CVE-2026-20245 Cisco Catalyst SD-WAN Manager: software flaw
In plain words: A mistake in the software that attackers have found a way to abuse. Depends on the product — see the description and the vendor advisory.
Confirmed exploited by CISA on · US federal patch deadline Jun 23, 2026
What to do
- Install Cisco's security update for Catalyst SD-WAN Manager. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Patch edge devices first — attackers often start scanning for them within hours of a fix.
- Never expose the device's admin page to the internet.
- After patching a device that was exposed, follow the vendor's compromise checks, end active sessions and change passwords.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: They face the internet and guard the whole network, so a flaw here can hand attackers a way in — and these devices usually run no antivirus, so break-ins go unnoticed.
The details
- Official name
- Cisco Catalyst SD-WAN Manager Improper Encoding or Escaping of Output Vulnerability
- Product
- Cisco Catalyst SD-WAN Manager
- CISA description
- Cisco Catalyst SD-WAN Manager formerly SD-WAN vManage contains an improper encoding or escaping of output vulnerability. This vulnerability could allow an authenticated, local attacker to execute arbitrary commands as root by supplying a crafted file to the affected system.
- Type of flaw
- Software flaw (CWE-116)
- Confirmed exploited
- Jun 9, 2026
- US federal patch deadline
- Jun 23, 2026
Ask Cleus about it
Ask about a vulnerability, an update, a weird message, or the news. Plain-word answers, free, no account.
Answering about CVE-2026-20245 ·
Questions about CVE-2026-20245
Is CVE-2026-20245 being exploited?
Yes. CISA added CVE-2026-20245 to its Known Exploited Vulnerabilities catalog on Jun 9, 2026, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2026-20245?
Install Cisco's security update for Catalyst SD-WAN Manager. If no update exists, follow the vendor's workaround or stop using the product until one ships. Patch edge devices first — attackers often start scanning for them within hours of a fix.
Am I affected by CVE-2026-20245?
Only if you use Cisco Catalyst SD-WAN Manager. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.