NVD / CVE Program· CNA cisco

CVE-2026-20131: Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability

Noroxi assessment

Priority: Now (action score 83/100)

CISA has confirmed exploitation in the wild (Mar 19, 2026); it is known to be used in ransomware campaigns. Remediation deadline for US federal agencies: Mar 22, 2026.
Probability of exploitation in the next 30 days: 43.1% (FIRST EPSS); higher than 98.7% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
According to the record, no fixed version is available yet.

Patch today or shut off access. Until a fix is released, restrict access to the affected component and follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to execute arbitrary Java code as root on an affected device. This vulnerability is due to insecure deserialization of a user-supplied Java byte stream. An attacker could exploit this vulnerability by sending a crafted serialized Java object to the web-based management interface of an affected device. A successful exploit could allow the attacker to execute arbitrary code on the device and elevate privileges to root. Note: If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced.

CriticalCVSS 10.0 · v3.1KEVWeaponized No fix recorded

BDU:2026-02531

Published: Mar 4, 2026
Updated: Aug 14, 2026
EPSS: 43.1% · 98th percentile
CWE: CWE-502

Report tools

JSON

Action score

Now

Patch today or shut off access.

CVSS: 40 / 40 · 10.0 / 10
CISA KEV: 30 / 30 · Listed
EPSS: 13 / 30 · 43.1%

CISA SSVC decision

Exploitation: active
Automatable: yes
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · cisco: 10.0; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Mar 19, 2026. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Mar 22, 2026.

Known to be used in ransomware campaigns.

Get told when this record changes

In CISA KEV: exploitation in the wild confirmed
Weaponized exploit exists
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
cisco	secure firewall management center	cpe:2.3:a:cisco:secure_firewall_management_center

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

cisco secure firewall management center10.0.0
cisco secure firewall management center6.4.0.13
cisco secure firewall management center6.4.0.14
cisco secure firewall management center6.4.0.15
cisco secure firewall management center6.4.0.16
cisco secure firewall management center6.4.0.17
cisco secure firewall management center6.4.0.18
cisco secure firewall management center7.0.0
cisco secure firewall management center7.0.0.1
cisco secure firewall management center7.0.1
cisco secure firewall management center7.0.1.1
cisco secure firewall management center7.0.2
cisco secure firewall management center7.0.2.1
cisco secure firewall management center7.0.3
cisco secure firewall management center7.0.4
cisco secure firewall management center7.0.5
cisco secure firewall management center7.0.6
cisco secure firewall management center7.0.6.1
cisco secure firewall management center7.0.6.2
cisco secure firewall management center7.0.6.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (cisco). Independent of NVD's CPE analysis and usually ahead of it.

Cisco Cisco Secure Firewall Management Center (FMC)
- 7.0.0, 7.0.0.1, 7.0.1, 7.1.0, 6.4.0.13, 7.0.1.1, 6.4.0.14, 7.1.0.1, 7.0.2, 6.4.0.15, 7.2.0, 7.0.2.1 … (+28)affected

Same product

cisco: all records

Other highest-scoring records for the same primary product.

CVE-2026-20079Cisco Secure Firewall Management Center Authentication Bypass Remote Code Execution VulnerabilityKEV
97Now
CVE-2026-20316Cisco Secure Firewall Management Center Software Static Credential VulnerabilityKEV
62This week
CVE-2016-6433The Threat Management Console in Cisco Firepower Management Center 5.2.0 through 6.0.1 allows remote authenticated users to execute arbitrar
59Plan

Published before and after this one in the same product

← EarlierCVE-2026-20002Mar 4, 2026 · A vulnerability in the web-based management interface of Cisco Secure FMC Software could allow an authenticated, remote attacker to conduct
32Monitor
← EarlierCVE-2026-20003Mar 4, 2026 · A vulnerability in the REST API of Cisco Secure FMC Software could allow an authenticated, remote attacker to conduct SQL injection attacks
19Monitor
← EarlierCVE-2026-20044Mar 4, 2026 · Cisco Secure Firewall Management Center Command Injection Vulnerability
24Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

Proof-of-concept repository on GitHub ×5

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Proof-of-concept repository on GitHub	stars:0	2026-03-06
Proof-of-concept repository on GitHub	stars:3	2026-03-11
Proof-of-concept repository on GitHub	stars:2	2026-04-07
Proof-of-concept repository on GitHub	stars:0	2026-05-10
Proof-of-concept repository on GitHub	stars:0	2026-08-28

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedMar 4, 2026
First PoCMar 6, 2026+1 d
CISA KEVMar 19, 2026+14 d
TodayOct 26, 2026+236 d

EPSS, last 120 days+1% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Changed
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-502 · Deserialization of Untrusted Data

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

nvd-secondary

Root cause

Data received over the network is deserialized into the language’s native object format without verifying its source. Code paths inside the object can be triggered during deserialization.

The bug in code

The whole CWE-502 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

python

1payload = sock.recv(65536)
2job = pickle.loads(payload)

Fixed

python

1payload = sock.recv(65536)
2if not hmac.compare_digest(sign(payload), header_sig):
3    raise PermissionError("invalid signature")
4job = JobSchema.validate(json.loads(payload))

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

Object InjectionCAPEC-586likelihood: Medium · High

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-rce-NKhnULJh

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records