CVE-2021-40114

Low

No strong exploitation signal.

CVSS base

6.8 MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS — probability of exploitation (30 days)

2.4%

83.6th percentile

CISA KEV

Not listed

Weakness / dates

CWE-401

Published 2021-10-27 · modified 2026-08-11

CVSS breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

Attack Vector	N	Network
Attack Complexity	H	High
Privileges Required	N	None
User Interaction	N	None
Scope	C	Changed
Confidentiality	N	None
Integrity	N	None
Availability	H	High

Timeline

2021-10-27 — Published (NVD)
2026-08-11 — Last modified (NVD)

Description

Multiple Cisco products are affected by a vulnerability in the way the Snort detection engine processes ICMP traffic 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 memory resource management while the Snort detection engine is processing ICMP packets. An attacker could exploit this vulnerability by sending a series of ICMP packets through an affected device. A successful exploit could allow the attacker to exhaust resources on the affected device, causing the device to reload.

Affected

cisco snort

References

Official: NVD · CVE.org