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01 Record

CVE-2026-20218

Cisco Secure Firewall Threat Defense Snort 3 Visual Basic for Applications Buffer Overflow Denial of Service Vulnerability

MediumPUBLISHEDCNA: cisco
CNA base score5.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
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02 Description

Cisco Secure Firewall Threat Defense Snort 3 Visual Basic for Applications Buffer Overflow Denial of Service Vulnerability

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.63% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 49.8% of scored records. A rank, not a probability.
NVD base score
5.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
NVD analysis status
Awaiting Analysis. NVD last modified this record on 2026-10-22.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-10-21 16:12Z8 DAYS AGO
Last updated
2026-10-22 19:11Z7 DAYS AGO
Reserved
2025-10-08
Assigning CNA
cisco
Record state
PUBLISHED
Severity
Medium (CVSS 5.8)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Weaknesses
  • CWE-121Stack-based Buffer OverflowVariant
Data version
5.2
Document digest
8a985a351cff0908bf4a09eb29c940462bba27b6709a4f1631c172c9e859f52a

05 Affected products

VendorProductVersionsPlatforms
CiscoCisco Open Source Snort33.12.2.0, 3.1.2.0, 3.1.3.0, 3.1.4.0, 3.1.5.0, 3.1.6.0, 3.1.7.0, 3.1.8.0, 3.1.9.0, 3.1.10.0, 3.1.12.0, 3.1.13.0, 3.1.14.0, 3.1.15.0, 3.1.16.0, 3.1.17.0, 3.1.18.0, 3.1.19.0, 3.1.20.0, 3.1.21.0, 3.1.22.0, 3.1.23.0, 3.1.24.0, 3.1.25.0, 3.1.27.0, 3.1.28.0, 3.1.29.0, 3.1.30.0, 3.1.31.0, 3.1.32.0, 3.1.36.0, 3.1.38.0, 3.1.39.0, 3.1.40.0, 3.1.41.0, 3.1.42.0, 3.1.43.0, 3.1.45.0, 3.1.47.0, 3.1.48.0, 3.1.50.0, 3.1.51.0, 3.1.52.0, 3.1.53.0, 3.1.55.0, 3.1.56.0, 3.1.57.0, 3.1.58.0, 3.1.59.0, 3.1.60.0, 3.1.61.0, 3.1.62.0, 3.1.63.0, 3.1.64.0, 3.1.65.0, 3.1.66.0, 3.1.67.0, 3.1.69.0, 3.1.70.0, 3.1.71.0, 3.1.72.0, 3.1.73.0, 3.1.74.0, 3.1.75.0, 3.1.76.0, 3.1.77.0, 3.1.78.0, 3.1.81.0, 3.1.82.0, 3.1.83.0, 3.1.84.0, 3.2.1.0, 3.2.2.0, 3.3.0.0, 3.3.1.0, 3.3.2.0, 3.3.3.0, 3.3.4.0, 3.3.5.0, 3.3.7.0, 3.5.0.0, 3.5.1.0, 3.8.1.0, 3.6.0.0, 3.6.2.0, 3.9.3.0, 3.7.2.0, 3.7.0.0, 3.9.6.0, 3.10.0.0, 3.10.2.0, 3.7.4.0, 3.9.0.0, 3.5.2.0, 3.12.1.0, 3.6.1.0, 3.9.2.0, 3.6.3.0, 3.9.5.0, 3.7.1.0, 3.9.7.0, 3.7.3.0, 3.10.1.0, 3.9.1.0, 3.11.1.0—
CiscoCisco Secure Firewall Threat Defense (FTD) Software7.2.0, 7.2.0.1, 7.2.1, 7.3.0, 7.2.2, 7.2.3, 7.3.1, 7.2.4, 7.2.5, 7.2.4.1, 7.3.1.1, 7.4.0, 7.2.5.1, 7.4.1, 7.2.6, 7.4.1.1, 7.2.7, 7.2.5.2, 7.3.1.2, 7.2.8, 7.6.0, 7.4.2, 7.2.8.1, 7.4.2.1, 7.2.9, 7.7.0, 7.4.2.2, 7.2.10, 7.6.1, 7.4.2.3, 7.6.2, 7.7.10, 7.7.11, 7.6.2.1, 7.7.10.1, 7.4.2.4, 7.2.10.2, 7.4.3, 7.6.4, 10.0.0, 7.4.4, 7.2.11, 7.4.7—
CiscoCisco UTD SNORT IPS Engine Software17.12.1a, 17.12.2, 17.13.1a, 17.12.3, 17.14.1a, 17.12.4, 17.12.3a, 17.15.1a, 17.16.1a, 17.12.4a, 17.15.2c, 17.12.4b, 17.15.2a, 17.12.5, 17.17.1, 17.12.5a, 17.15.3a, 17.15.3, 17.12.5b, 17.12.5c, 17.15.4, 17.18.1, 17.18.1a, 17.12.6, 17.15.4c, 17.12.5d, 17.18.2, 26.1.1, 17.15.5, 17.15.5a, 17.12.7, 17.12.7a, 17.12.7b, 17.18.3a, 17.12.8, 17.15.6, 17.18.4, 26.1.2—

06 References