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01 Record

CVE-2026-20221

Multiple Cisco Products Snort 3 Generic Routing Encapsulation Denial of Service Vulnerabilities

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

Multiple Cisco Products Snort 3 Generic Routing Encapsulation Denial of Service Vulnerabilities

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
0.57% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 47.2% 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 16:12Z7 DAYS AGO
Last updated
2026-10-22 19:11Z6 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-476NULL Pointer DereferenceBase
Data version
5.2
Document digest
da14e060f2113cff3f323f6081dfddd967cb5fab835839806cf2cf2fa95e23ae

05 Affected products

VendorProductVersionsPlatforms
CiscoCisco Cyber Vision3.0.0, 3.0.2, 3.0.3, 3.0.1, 3.1.0, 3.0.4, 3.1.1, 3.1.2, 3.2.0, 3.0.5, 3.2.1, 3.0.6, 3.2.2, 3.2.3, 3.2.4, 4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.1.0, 4.1.1, 4.1.2, 4.1.3, 4.1.4, 4.2.0, 4.2.1, 4.1.5, 4.2.2, 4.2.X, 4.2.3, 4.2.4, 4.2.6, 4.1.6, 4.3.0, 4.3.1, 4.3.2, 4.3.3, 4.4.0, 4.4.1, 4.4.2, 4.4.3, 4.1.7, 5.0.0, 5.0.1, 5.0.2, 5.1.0, 5.1.1, 5.1.2, 5.1.3, 5.2.0, 5.2.1, 5.3.0, 5.3.1, 5.3.2, 5.3.3, 5.5.1, 5.6.1, 5.6.0, 5.4.0, 5.4.1, 5.4.2—
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) Software7.0.0, 7.0.0.1, 7.0.1, 7.0.1.1, 7.0.2, 7.2.0, 7.0.2.1, 7.0.3, 7.2.0.1, 7.0.4, 7.2.1, 7.0.5, 7.3.0, 7.2.2, 7.2.3, 7.3.1, 7.2.4, 7.0.6, 7.2.5, 7.2.4.1, 7.3.1.1, 7.4.0, 7.0.6.1, 7.2.5.1, 7.4.1, 7.2.6, 7.0.6.2, 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, 7.0.6.3, 7.4.2.1, 7.2.9, 7.0.7, 7.7.0, 7.4.2.2, 7.2.10, 7.6.1, 7.4.2.3, 7.0.8, 7.6.2, 7.7.10, 7.7.11, 7.0.8.1, 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, 7.0.9, 7.2.11, 7.4.7—
CiscoCisco Umbrella Insights Virtual Appliance2.6.0, 2.5.6, 2.5, 2.4.12, 2.7, 2.6.2, 2.5.5, 2.5.4, 2.8, 2.6.1, 2.5.7, 1.5.4, 1.5.5, 1.5.6, 2.0.0, 2.0.2, 2.0.3, 2.1.0, 2.1.2, 2.1.4, 2.1.5, 2.2, 2.2.1, 2.3, 2.3.1, 2.4, 2.4.4, 2.4.6, 2.8.9, 3.0, 3.1, 3.2, 2.8.1, 2.8.2, 2.8.3, 2.8.4, 2.8.5, 3.0.1, 3.0.2, 3.0.4, 3.0.5, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.2.1, 3.2.2, 3.2.3, 3.3, 3.3.1, 3.3.2, 3.3.3, 3.3.4, 3.4, 3.4.1, 3.4.2, 3.4.3, 3.4.4, 3.4.5, 3.4.6, 3.5, 2.7.1, 2.7.2, 2.7.6, 2.7.9, 2.7.10, 3.5.1, 3.5.2, 3.6.1, 3.6.2, 3.7, 3.7.1, 3.8.3—
CiscoCisco UTD SNORT IPS Engine Software3.17.1S, 16.12.3, Fuji-16.9.5, 16.12.4, 17.3.1a, 16.6.6, 16.12.2, Fuji-16.9.6, 3.17.0S, Fuji-16.9.3, Denali-16.3.7, Fuji-16.9.2, Fuji-16.9.4, Everest-16.6.4, Everest-16.6.3, 16.6.5, Denali-16.3.5, 17.2.1r, 17.1.1, Everest-16.6.2, 16.6.7a, Denali-16.3.4, 16.6.1, Denali-16.3.9, Denali-16.3.3, 16.12.1a, 17.3.2, 17.4.1a, 16.12.5, 17.5.1, Fuji-16.9.7, 16.6.9, 17.3.3, 17.5.1a, 17.3.4, 17.3.4a, 17.4.2, 17.4.1b, 17.6.1a, 16.6.10, 17.7.1a, 16.12.6, Fuji-16.9.8, 17.6.2, 17.8.1a, 16.12.7, 17.3.5, 17.6.3, 17.6.3a, 17.7.2, 17.9.1a, 17.6.4, 17.10.1a, 17.3.6, 16.12.8, 17.3.7, 17.9.2a, 17.6.5, 17.11.1a, 17.9.3a, 17.12.1a, 17.9.4, 17.6.6, 17.3.8, 17.3.8a, 17.6.6a, 17.9.4a, 17.12.2, 17.13.1a, 17.9.5a, 17.12.3, 17.6.7, 17.14.1a, 17.12.4, 17.12.3a, 17.15.1a, 17.6.8, 17.9.6, 17.6.8a, 17.16.1a, 17.9.5e, 17.12.4a, 17.15.2c, 17.9.5f, 17.12.4b, 17.15.2a, 17.12.5, 17.17.1, 17.12.5a, 17.9.7a, 17.15.3a, 17.15.3, 17.12.5b, 17.12.5c, 17.15.4, 17.9.7b, 17.18.1, 17.18.1a, 17.12.6, 17.9.8, 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, 17.9.9, 17.18.3a, 17.12.8, 17.15.6, 17.18.4, 26.1.2, 17.9.10—

06 References