CVE-2026-20182 Cisco Catalyst SD-WAN: login or permission bypass
In plain words: A door that should be locked is not: part of the system can be reached without a valid login or permission. The attacker gets in as a user or administrator without knowing a password.
Confirmed exploited by CISA on · US federal patch deadline May 17, 2026
What to do
- Install Cisco's security update for Catalyst SD-WAN. 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 Controller Authentication Bypass Vulnerability
- Product
- Cisco Catalyst SD-WAN
- CISA description
- Cisco Catalyst SD-WAN Controller & Manager contain an authentication bypass vulnerability that allows an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system.
- Type of flaw
- Login or permission bypass (CWE-287)
- Confirmed exploited
- May 14, 2026
- US federal patch deadline
- May 17, 2026
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Answering about CVE-2026-20182 ·
Questions about CVE-2026-20182
Is CVE-2026-20182 being exploited?
Yes. CISA added CVE-2026-20182 to its Known Exploited Vulnerabilities catalog on May 14, 2026, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2026-20182?
Install Cisco's security update for Catalyst SD-WAN. 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-2026-20182?
Only if you use Cisco Catalyst SD-WAN. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.