Denial of service in multiple Cisco Products



Published: 2021-10-29
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
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Cisco Firepower Threat Defense (FTD)
Hardware solutions / Security hardware applicances

Snort
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor Cisco Systems, Inc

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Improper Handling of Unexpected Data Type

EUVDB-ID: #VU57800

Risk: High

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-40116

CWE-ID: CWE-241 - Improper Handling of Unexpected Data Type

Exploit availability: No

Description

The 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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Cisco Firepower Threat Defense (FTD): 7.0.0

Snort: before 3.1.0.100


CPE2.3 External links

http://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.



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