Vulnerability Description
Multiple Cisco products are affected by a vulnerability in Snort rules that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.The vulnerability is due to improper handling of the Block with Reset or Interactive Block with Reset actions if a rule is configured without proper constraints. An attacker could exploit this vulnerability by sending a crafted IP packet to the affected device. A successful exploit could allow the attacker to cause through traffic to be dropped. Note: Only products with Snort3 configured and either a rule with Block with Reset or Interactive Block with Reset actions configured are vulnerable. Products configured with Snort2 are not vulnerable.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Secure Firewall Management Center | 3.1.0.1 |
| Cisco | Secure Firewall Threat Defense | >= 6.4.0, < 6.4.0.13 |
| Cisco | Snort | >= 3.0.0.0, < 3.1.0.100 |
Related Weaknesses (CWE)
References
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sVendor Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sVendor Advisory
FAQ
What is CVE-2021-40116?
CVE-2021-40116 is a vulnerability with a CVSS score of 8.6 (HIGH). Multiple Cisco products are affected by a vulnerability in Snort rules that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.The vulne...
How severe is CVE-2021-40116?
CVE-2021-40116 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-40116?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Secure Firewall Management Center, Cisco Secure Firewall Threat Defense, Cisco Snort.