Exploited vulnerabilities / CVE-2026-20079
Confirmed exploited · authentication bypass · Cisco Secure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall ManagementCVE-2026-20079
Cisco Secure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall Management authentication bypass, confirmed exploited in the wild.
Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management contain an authentication Bypass using an alternate path or channel vulnerability that could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system.
| CISA's name for it | Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel Vulnerability |
|---|---|
| Vendor and product | Cisco · Secure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall Management |
| Type | authentication bypass · CWE-288 |
| Exploited | Confirmed by CISA listed 9 September 2026 |
| Likelihood | one of the most likely to be exploited of every vulnerability tracked |
| Deadline | 12 September 2026 · already passed |
| Used in ransomware | Not reported |
| Advisories | sec.cloudapps.cisco.com ↗ · www.cisa.gov ↗ · www.cisa.gov ↗ · nvd.nist.gov ↗ |
Three steps, in this order
Apply the vendor fix and restart the affected service.
Put the login or management interface behind a VPN or allow-list; a bypass makes passwords irrelevant.
Rotate credentials and session keys the product holds, and review accounts and configuration changes since the listing date.
| CISA's required action | Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. |
|---|
Know before someone else finds it
Threat Landscape Monitoring fingerprints the software your internet-facing hosts disclose and matches it, every day, against this list and the exploitation scores. When a new entry touches something you run, you are told once, with the host and the fix. The free plan covers one domain.
CVE-2026-20079 in short
Is CVE-2026-20079 being exploited?
Yes. CISA added CVE-2026-20079 to its Known Exploited Vulnerabilities catalogue on 9 September 2026, which it does only on evidence of exploitation in the wild.
What is the CISA deadline for CVE-2026-20079?
US federal agencies must remediate it by 12 September 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.
How likely is CVE-2026-20079 to be exploited in the next 30 days?
FIRST's Exploit Prediction Scoring System gives it 89%, the 99th percentile of every CVE it scores.
How do I fix CVE-2026-20079?
Apply the vendor fix and restart the affected service. Put the login or management interface behind a VPN or allow-list; a bypass makes passwords irrelevant. Rotate credentials and session keys the product holds, and review accounts and configuration changes since the listing date.
Other Cisco vulnerabilities being exploited
| CVE | Product | Type | Listed |
|---|---|---|---|
| CVE-2026-20320 | BroadWorks | exploited vulnerability | 10 November 2026 |
| CVE-2026-76418 | Secure Firewall ASA Software and Cisco Secure FTD Software | denial of service | 29 October 2026 |
| CVE-2026-76519 | Secure Email Gateway | path traversal | 14 October 2026 |
| CVE-2026-76504 | Catalyst SD-WAN Manager | privilege escalation | 30 September 2026 |
| CVE-2026-76460 | Identity Services Engine | privilege escalation | 16 September 2026 |
| CVE-2026-76461 | Secure Email Gateway | SQL injection | 14 September 2026 |
Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.