CVE-2026-20316
MediumExploitedPublic exploitA vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to log in to an affected device using a low-privileged account to access sensitive data within the impacted systems.
Published Jul 29, 2026 · Updated Sep 16, 2026 · Also known as EUVD-2026-50404, GHSA-x85f-hvgg-4944, TR-26-0700
Key Facts
Patch immediately- CVE-2026-20316 is a medium-severity vulnerability (CVSS 5.3 v3.1) affecting Secure Firewall Management Center (Cisco), Cisco Secure Firewall Management Center (FMC).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jul 29, 2026 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 35% probability of exploitation in the next 30 days.
- Fixed versions are available, including Secure Firewall Management Center 7.0.9.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS (30-day exploit likelihood)
35%
Higher than 98.4% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-20316 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to log in to an affected device using a low-privileged account to access sensitive data within the impacted systems.
This vulnerability is due to the presence of static user credentials for a low-privileged account. An attacker could exploit this vulnerability by using the account to log in to an affected system. A successful exploit could allow the attacker to log in to the affected system and access sensitive data as the low-privileged user. Note: If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced. Cisco has assigned this security advisory a Security Impact Rating (SIR) of High rather than Medium as the score indicates. The reason is that this vulnerability can be used with other Cisco Secure FMC Software vulnerabilities to elevate privileges.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Jul 29, 2026 | Aug 1, 2026 | Known |
| Industry KEV feed | Jul 29, 2026 | Aug 1, 2026 | Known |
| CIRCL KEV | Jul 29, 2026 | Aug 1, 2026 | Not reported |
| ENISA EUVD | Jul 29, 2026 | n/a | Not reported |
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.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Secure Firewall Management CenterCisco | See advisory | 7.0.9 |
| Cisco Secure Firewall Management Center (FMC) | >= 7.0.0 | n/a |
Patched Releases
Secure Firewall Management Center
7.0.9
Timeline
Publicly disclosed
Jul 29, 2026
Added to CISA KEV
Jul 29, 2026
Added to Industry KEV feed
Jul 29, 2026
Added to CIRCL KEV
Jul 29, 2026
Added to ENISA EUVD
Jul 29, 2026
Last updated
Sep 16, 2026
Weakness Type
- CWE-259 Use of Hard-coded Password
References
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-20316
- advisoryUSOM advisory
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to log in to an affected device using a low-privileged account to access sensitive data within the impacted systems.
Affected: Secure Firewall Management Center (Cisco); Cisco Secure Firewall Management Center (FMC) versions >= 7.0.0. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jul 29, 2026 and is known to be used in ransomware campaigns.
Yes. It was added on Jul 29, 2026 with a federal remediation due date of Aug 1, 2026.
Public exploit code is available.
Fixed versions are available, including Secure Firewall Management Center 7.0.9.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2026-20316 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo