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VulnerabilityPublished

CVE-2026-20324: Missing Authorization

Source GCVE Database

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Authoritative record:CVE-2026-20324· Critical 9.9

Not known to be exploited · CVSS 9.9 Critical.

Data as of 31 Oct 2026, 20:20 UTC

CVSS 3.1 base score
9.9Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.6% chance of exploitation in 30 days – higher than 49% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 16 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 31 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
CiscoCisco Secure Firewall Management Center (FMC)Affected
  • 7.0.0 – 10.0.1
68 affected builds
Fixed in–

AI-suggested

Until a patch is available, restrict access to valid user credentials and monitor for unauthorized sftunnel communication. Follow Cisco's official guidance once published.

Description

CVE-2026-20324 is a critical vulnerability in the sftunnel inter-device communication protocol of Cisco Secure Firewall Management Center (FMC) Software. It allows an authenticated remote attacker with valid user credentials to execute arbitrary commands as root by exploiting improper file write permissions. The attacker can hijack or act as a registered sftunnel peer to write and execute malicious files with root privileges on the affected device.

References

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