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CVE-2026-20079 CISA KEV · Actively exploitedSuited to automated attack · CISA

Cisco Secure Firewall Management Center Authentication Bypass Remote Code Execution Vulnerability

CVSS score

10.0

EPSS probability

%88.2

Risk score

17.6

Published

7 mo ago

OverviewPublic Exploits (2)NewsroomVulnerability Timeline
Mitigation available

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.

Impact on My Inventory

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Vulnerability description

DayBreach CVE AI Research

CVE-2026-20079 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software 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.  This vulnerability is due to an improper system process that is created at boot time. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute a variety of scripts and commands that allow root access to the device. 

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-20079 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1ciscoCisco Secure Firewall Management Center (FMC) View
2ciscosecure firewall management center View
3ciscosecure firewall management center View
4ciscosecure firewall management center View
5ciscosecure firewall management center View
6ciscosecure firewall management center View
7ciscosecure firewall management center View
8ciscosecure firewall management center View
9ciscosecure firewall management center View
10ciscosecure firewall management center View
11ciscosecure firewall management center View
12ciscosecure firewall management center View
13ciscosecure firewall management center View
14ciscosecure firewall management center View
15ciscosecure firewall management center View
16ciscosecure firewall management center View
17ciscosecure firewall management center View
18ciscosecure firewall management center View
19ciscosecure firewall management center View
20ciscosecure firewall management center View
21ciscosecure firewall management center View
22ciscosecure firewall management center View
23ciscosecure firewall management center View
24ciscosecure firewall management center View
25ciscosecure firewall management center View
26ciscosecure firewall management center View
27ciscosecure firewall management center View
28ciscosecure firewall management center View
29ciscosecure firewall management center View
30ciscosecure firewall management center View
31ciscosecure firewall management center View
32ciscosecure firewall management center View
33ciscosecure firewall management center View
34ciscosecure firewall management center View
35ciscosecure firewall management center View
36ciscosecure firewall management center View
37ciscosecure firewall management center View
38ciscosecure firewall management center View
39ciscosecure firewall management center View
40ciscosecure firewall management center View
41ciscosecure firewall management center View
42ciscosecure firewall management center View
43ciscosecure firewall management center View
44ciscosecure firewall management center View
45ciscosecure firewall management center View
46ciscosecure firewall management center View
47ciscosecure firewall management center View
48ciscosecure firewall management center View
49ciscosecure firewall management center View
50ciscosecure firewall management center View
51ciscosecure firewall management center View
52ciscosecure firewall management center View
53ciscosecure firewall management center View
54ciscosecure firewall management center View
55ciscosecure firewall management center View
56ciscosecure firewall management center View
57ciscosecure firewall management center View
58ciscosecure firewall management center View
59ciscosecure firewall management center View
60ciscosecure firewall management center View
61ciscosecure firewall management center View
62ciscosecure firewall management center View
63ciscosecure firewall management center View
64ciscosecure firewall management center View
65ciscosecure firewall management center View
66ciscosecure firewall management center View
67ciscosecure firewall management center View
68ciscosecure firewall management center View
69ciscosecure firewall management center View
70ciscosecure firewall management center View
71ciscosecure firewall management center View
72ciscosecure firewall management center View
73ciscosecure firewall management center View
Total affected vendors: 1|Products: 73

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
10.0CVSS V31CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HNVD
10.0CVSS V3_1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HCVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Workaround

Resmî yama doğrulanamadı; geçici azaltım veya workaround mevcut.

canonical

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.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

CVE-2026-20079 : the database holds 2 public PoC/exploit sources for it. For direct links to the sources, open the Public Exploits tab.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-20079 is associated with the following CWEs:

CWE-288: Common Weakness Enumeration Entry CWE-288

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-20079 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden
PermissionsGerekmiyor
UserGerekmiyor

Official Sources and Advisories

cisco-sa-onprem-fmc-authbypass-5JPp45V2vendor-advisoryhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20079nvdCISA Known Exploited Vulnerabilities Catalogkev

CVSS Vector Radar Chart

10.0 / 10
Attack VectorNetworkComplexityLowPrivilegesNoneUser Interact.NoneConfidentialityLowIntegrityNoneAvailabilityHigh

Vulnerability Scoring Details

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone required
User InteractionNone required
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)None
Availability (Erişilebilirlik)High

Geçici çözüm

Resmî yama doğrulanamadı; geçici azaltım veya workaround mevcut.

Follow the vendor

C
cisco logo
cisco

Weakness Type (CWE & CAPEC)

CWE-288

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