October 28, 2026

CVE Watchtower

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CVE-2026-20242NVD

Vulnerability Summary

A vulnerability in the External Database Access feature of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to execute arbitrary commands as root on an affected device.

This vulnerability is due to insecure deserialization of a user-supplied Java byte stream from a host that is configured in the external database access list. An attacker could exploit this vulnerability by sending a crafted, serialized Java byte stream to a specific TCP port of an affected device. A successful exploit could allow the attacker to execute arbitrary commands on the device and elevate privileges to root.
Notes:

This vulnerability can be exploited only by an attacker who has control of a host in the external database access list.
If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced.
Severity Level
CRITICAL(9.8)
Published Date
Sep 16, 2026
Last Modified
Sep 18, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.64%Probability
Root Weakness (CWE)
CWE-502: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v3.1 Base Metrics — Score 9.8 (CRITICAL)
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.0
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.0.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.1.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.2
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.0
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.2.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.3
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.0.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.4
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.5
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.3.0
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.2
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.3.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.3
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.3.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.4
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.6
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.4.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.5
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.3.1.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.0
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.6.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.5.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.6
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.1.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.6.2
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.7
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.5.2
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.3.1.2
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.8
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.0
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.2
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.8.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.6.3
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.2.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.9
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.7
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.7.0
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.2.2
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.10
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.2.3
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.8
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.2
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.7.10
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.10.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.8.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.2.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.10.2
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.7.10.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.2.4
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.3
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.3
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.7.11
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.4
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 10.0.0
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.4
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.5
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.9
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.11
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.7.12
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.5
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.6
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 10.0.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.7
Patched Versions
Not provided by cveorg for this CVE.
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🚫Ad-Free — Uninterrupted experience.
🎁7-Day Free Trial — Try Pro or Team, no card required.
📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
📈EPSS Spike Alerts — Catch rising risk before it peaks.
🎯Custom EPSS/CVSS — Filter noise, focus on risk.
🛡️Exploit Intel — A 2nd confirmed-exploit signal beyond KEV.
🐙GitHub Issues — Auto-tracked, no duplicates.
📬Weekly Digest — One clean summary, not inbox spam.
🏷️Watchlist Groups — Tag alerts by team (Infra/AppSec/SOC).
💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
🚫Ad-Free — Uninterrupted experience.

External References