How severe is CVE-2021-34794?

CVE-2021-34794 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2021-34794 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34794?

CVE-2021-34794 primarily affects Cisco Firepower Threat Defense. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-34794?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-34794 published?

CVE-2021-34794 was published on 2021-10-27 and last updated on 2026-06-17.

CVE-2021-34794

CVE-2021-34794 is a medium-severity vulnerability in Cisco Firepower Threat Defense with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-284
Affected product: Cisco Firepower Threat Defense
Published: 2021-10-27
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-34794?: 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.
How severe is CVE-2021-34794?: CVE-2021-34794 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-34794 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34794?: CVE-2021-34794 primarily affects Cisco Firepower Threat Defense. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-34794?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-34794 published?: CVE-2021-34794 was published on 2021-10-27 and last updated on 2026-06-17.

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-snmpaccess-M6yOweq3

Affected products (26)

cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5512-x_firmware:009.014\(001\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5512-x_firmware:099.015\(001.033\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5512-x_firmware:099.016\(001.216\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5505_firmware:009.014\(001\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5505_firmware:099.015\(001.033\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5505_firmware:099.016\(001.216\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5515-x_firmware:009.014\(001\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5515-x_firmware:099.015\(001.033\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5515-x_firmware:099.016\(001.216\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5525-x_firmware:009.014\(001\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5525-x_firmware:099.015\(001.033\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5525-x_firmware:099.016\(001.216\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5545-x_firmware:009.014\(001\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5545-x_firmware:099.015\(001.033\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5545-x_firmware:099.016\(001.216\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5555-x_firmware:009.014\(001\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5555-x_firmware:099.015\(001.033\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5555-x_firmware:099.016\(001.216\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5580_firmware:009.014\(001\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5580_firmware:099.015\(001.033\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5580_firmware:099.016\(001.216\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5585-x_firmware:009.014\(001\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5585-x_firmware:099.015\(001.033\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5585-x_firmware:099.016\(001.216\):*:*:*:*:*:*:*

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