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CVE-2021-34761

MEDIUMCVSS 6/10EPSS 0.21%

Last modified

CVE-2021-34761 is a medium-severity vulnerability rated 6/10 on the CVSS scale. A vulnerability in Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to overwrite or append arbitrary data to system files using root-level privileges. The attacker must have administrative credentials on the device. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

A vulnerability in Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to overwrite or append arbitrary data to system files using root-level privileges. The attacker must have administrative credentials on the device. This vulnerability is due to incomplete validation of user input for a specific CLI command. An attacker could exploit this vulnerability by authenticating to the device with administrative privileges and issuing a CLI command with crafted user parameters. A successful exploit could allow the attacker to overwrite or append arbitrary data to system files using root-level privileges.

Metrics

CVSS 3.1
6/10

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

EPSS Probability
0.21%

10.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoFirepower Management Center Virtual Appliance6.2.3
CiscoFirepower Management Center Virtual Appliance6.4.0
CiscoFirepower Management Center Virtual Appliance6.6.1
CiscoFirepower Management Center Virtual Appliance6.7.0
CiscoFirepower Management Center Virtual Appliance7.0.0
CiscoFirepower Management Center Virtual Appliance7.1.0
CiscoFirepower Threat Defense>= 6.4.0, < 6.4.0.13
CiscoFirepower Threat Defense>= 6.6.0, < 6.6.5
CiscoFirepower Threat Defense>= 6.7.0, < 6.7.0.3
CiscoFirepower Threat Defense>= 7.0.0, < 7.0.1
CiscoSourcefire Defense Center6.2.3
CiscoSourcefire Defense Center6.4.0
CiscoSourcefire Defense Center6.6.1
CiscoSourcefire Defense Center6.7.0
CiscoSourcefire Defense Center7.0.0
CiscoSourcefire Defense Center7.1.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-34761?
A vulnerability in Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to overwrite or append arbitrary data to system files using root-level privileges. The attacker must have administrative credentials on the device. This vulnerability is due to incomplete validation of user input for a specific CLI command. An attacker could exploit this vulnerability by authenticating to the device with administrative privileges and issuing a CLI command with crafted user parameters. A successful exploit could allow the attacker to overwrite or append arbitrary data to system files using root-level privileges.
How severe is CVE-2021-34761?
CVE-2021-34761 has a CVSS score of 6/10 (MEDIUM severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2021-34761?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-34761?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST