CVE-2021-34794: Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software SNMP Access Control Vulnerability

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-10-27 · updated 2026-08-11
Weakness: CWE-284

Description

A vulnerability in the Simple Network Management Protocol version 3 (SNMPv3) access control functionality of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to query SNMP data. This vulnerability is due to ineffective access control. An attacker could exploit this vulnerability by sending an SNMPv3 query to an affected device from a host that is not permitted by the SNMPv3 access control list. A successful exploit could allow the attacker to send an SNMP query to an affected device and retrieve information from the device. The attacker would need valid credentials to perform the SNMP query.

Affected products

Cisco ASA Software: from 9.14.0 before 9.14.2.4; from 9.15.0 before 9.15.1.7 — fixed in 9.14.2.4, 9.15.1.7
Cisco Asa 5505 Firmware: 009.014(001), 099.015(001.033), 099.016(001.216)
Cisco Asa 5512-X Firmware: 009.014(001), 099.015(001.033), 099.016(001.216)
Cisco Asa 5515-X Firmware: 009.014(001), 099.015(001.033), 099.016(001.216)
Cisco Asa 5525-X Firmware: 009.014(001), 099.015(001.033), 099.016(001.216)
Cisco Asa 5545-X Firmware: 009.014(001), 099.015(001.033), 099.016(001.216)
Cisco Asa 5555-X Firmware: 009.014(001), 099.015(001.033), 099.016(001.216)
Cisco Asa 5580 Firmware: 009.014(001), 099.015(001.033), 099.016(001.216)
Cisco Asa 5585-X Firmware: 009.014(001), 099.015(001.033), 099.016(001.216)
Cisco Firepower Threat Defense Software: from 6.4.0 before 6.4.0.13; from 6.5.0 before 6.6.5; from 6.7.0 before 6.7.0.1 — fixed in 6.4.0.13, 6.6.5, 6.7.0.1

How to fix

Upgrade to a fixed version: Cisco ASA Software 9.14.2.4, 9.15.1.7; Cisco Firepower Threat Defense Software 6.4.0.13, 6.6.5, 6.7.0.1. Check the vendor advisory for mitigations.

References

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