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ReviewHigh

CVE-2023-20244

Cisco Cisco Firepower Threat Defense Software, secure firewall threat defense, firepower 2110

A vulnerability in the internal packet processing of Cisco Firepower Threat Defense (FTD) Software for Cisco Firepower 2100 Series Firewalls could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of certain packets when they are sent to the inspection engine. An attacker could exploit this vulnerability by sending a series of crafted packets to an affected device. A successful exploit could allow the attacker to deplete all 9,472 byte blocks on the device, resulting in traffic loss ac...

CVSS
8.6
EPSS
0.77%
53.3% percentile
CISA KEV
Not listed
Published
2023.11.02
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.77%
Technical severityCVSS 8.6

Vulnerability overview

A vulnerability in the internal packet processing of Cisco Firepower Threat Defense (FTD) Software for Cisco Firepower 2100 Series Firewalls could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of certain packets when they are sent to the inspection engine. An attacker could exploit this vulnerability by sending a series of crafted packets to an affected device. A successful exploit could allow the attacker to deplete all 9,472 byte blocks on the device, resulting in traffic loss ac...

Affected product and versions

Product
Cisco Cisco Firepower Threat Defense Software, secure firewall threat defense, firepower 2110
Affected versions
>= 6.2.3, >= 6.2.3.1, >= 6.2.3.2, >= 6.2.3.3, >= 6.2.3.4, >= 6.2.3.5, >= 6.2.3.6, >= 6.2.3.7, >= 6.2.3.8, >= 6.2.3.10, >= 6.2.3.11, >= 6.2.3.9, >= 6.2.3.12, >= 6.2.3.13, >= 6.2.3.14, >= 6.2.3.15, >= 6.2.3.16, >= 6.2.3.17, >= 6.2.3.18, >= 6.6.0
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Cisco Cisco Firepower Threat Defense Software, secure firewall threat defense, firepower 2110 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE
CWE-771