TI-2021-01012 Aliases CVE-2021-1285 GHSA-278j-256r-v8r4

Multiple Cisco Products SNORT Ethernet Frame Decoder Denial of Service Vulnerability

LOW 38CWE-770Published 2024-11-18 · Updated 2024-11-18

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 3.0 · CNA. Fix status from CNA. Impact type from CWE-770.

Summary

Multiple Cisco products are affected by a vulnerability in the Ethernet Frame Decoder of the Snort detection engine that could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition. The vulnerability is due to improper handling of error conditions when processing Ethernet frames. An attacker could exploit this vulnerability by sending malicious Ethernet frames through an affected device. A successful exploit could allow the attacker to exhaust disk space on the affected device, which could result in administrators being unable to log in to the device or the device being unable to boot up correctly.Note: Manual intervention is required to recover from this situation. Customers are advised to contact the Cisco Technical Assistance Center (TAC) to help recover a device in this condition.Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.02945 87th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Cisco	Cisco UTD SNORT IPS Engine Software	16.12.3; Fuji-16.9.5; 16.12.4; 17.3.1a; 16.6.6; 16.12.2; Fuji-16.9.6; 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; Fuji-16.9.7	—	No fix listed	CNA

Cisco UTD SNORT IPS Engine Software VendorCisco Affected 16.12.3; Fuji-16.9.5; 16.12.4; 17.3.1a; 16.6.6; 16.12.2; Fuji-16.9.6; 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; Fuji-16.9.7 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-1285
2026-10-03 Alias added: GHSA-278j-256r-v8r4

References

Other 1

cisco-sa-snort-ethernet-dos-HGXgJH8n

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Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences