Denial of service in multiple Cisco Products
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2021-40116 |
| CWE-ID | CWE-241 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
Cisco Firepower Threat Defense (FTD) Hardware solutions / Security hardware applicances Snort Server applications / IDS/IPS systems, Firewalls and proxy servers |
| Vendor |
Cisco Systems, Inc Sourcefire |
Security Bulletin
This security bulletin contains one high risk vulnerability.
1) Improper Handling of Unexpected Data Type
EUVDB-ID: #VU57800
Risk: High
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]
CVE-ID: CVE-2021-40116
CWE-ID:
CWE-241 - Improper Handling of Unexpected Data Type
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper handling of the Block with Reset or Interactive Block with Reset actions if a rule is configured without proper constraints. A remote attacker can send a specially crafted IP packet and perform a denial of service (DoS) attack.
MitigationInstall update from vendor's website.
Vulnerable software versionsCisco Firepower Threat Defense (FTD): 7.0.0
Snort: before 3.1.0.100
CPE2.3 External linkshttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-dos-RywH7ezM
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
