CVE-2021-34762: Cisco Secure Firewall Threat Defense path traversal (CVSS 8.1)

Description

A vulnerability in the web-based management interface of Cisco Firepower Management Center (FMC) Software could allow an authenticated, remote attacker to perform a directory traversal attack on an affected device. The attacker would require valid device credentials. The vulnerability is due to insufficient input validation of the HTTPS URL by the web-based management interface. An attacker could exploit this vulnerability by sending a crafted HTTPS request that contains directory traversal character sequences to an affected device. A successful exploit could allow the attacker to read or write arbitrary files on the device.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredLow

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Affected products

Cisco Firepower Management Center Virtual Appliance6.2.3 · 6.4.0 · 6.5.0 · 6.6.1

Cisco Secure Firewall Threat Defense≥ 6.5.0 < 6.6.5 · ≥ 6.7.0 < 6.7.0.3 · ≥ 7.0.0 < 7.0.1 · < 6.4.0.13

Cisco Sourcefire Defense Center6.2.3 · 6.4.0 · 6.5.0 · 6.6.1

Remediation

Fixed in

Cisco Secure Firewall Threat Defense≥ 6.6.5

Patch & vendor advisories

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-dir-traversal-95UyW5tk

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-dir-traversal-95UyW5tkVendor Advisory

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2021-34762 being actively exploited?

CVE-2021-34762 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.99%.

How severe is CVE-2021-34762?

CVE-2021-34762 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 1.99% probability of exploitation.

Which products are affected by CVE-2021-34762?

Affected products include Cisco Firepower Management Center Virtual Appliance, Cisco Secure Firewall Threat Defense, Cisco Sourcefire Defense Center.

How do I fix CVE-2021-34762?

Upgrade affected software to a fixed version, for example Cisco Secure Firewall Threat Defense 6.6.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-34762 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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