Cisco Secure Endpoint up to 8.4.5.30483 FSG File Format Parser buffer overflow

Summaryinfo

A vulnerability classified as critical was found in Cisco Secure Endpoint. The affected element is an unknown function of the component FSG File Format Parser. Executing a manipulation can lead to buffer overflow. The identification of this vulnerability is CVE-2026-20214. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Cisco Secure Endpoint. This vulnerability affects an unknown function of the component FSG File Format Parser. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect availability. CVE summarizes:

A vulnerability in the FSG file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in FSG files during scanning, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted file that contains portable executable content compressed with FSG to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

The advisory is available at sec.cloudapps.cisco.com. This vulnerability was named CVE-2026-20214 since 10/08/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 07/01/2026).

Upgrading eliminates this vulnerability.

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Productinfo

Vendor

• Cisco

Name

• Secure Endpoint

Version

• 1.6.0
• 1.7.0
• 1.8.0
• 1.8.1
• 1.8.4
• 1.9.0
• 1.9.1
• 1.10.0
• 1.10.1
• 1.10.2
• 1.11.0
• 1.11.1
• 1.12.0
• 1.12.1
• 1.12.2
• 1.12.3
• 1.12.4
• 1.12.5
• 1.12.6
• 1.12.7
• 1.13.0
• 1.13.1
• 1.13.2
• 1.14.0
• 1.14.1
• 1.15.0
• 1.15.1
• 1.15.2
• 1.15.3
• 1.15.4
• 1.15.5
• 1.15.6
• 1.16.0
• 1.16.1
• 1.16.2
• 1.16.3
• 1.17.0
• 1.17.1
• 1.17.2
• 1.18.0
• 1.18.1
• 1.19.0
• 1.20.0
• 1.20.1
• 1.20.2
• 1.20.3
• 1.20.4
• 1.20.5
• 1.20.6
• 1.20.7
• 1.20.8
• 1.21.0
• 1.21.1
• 1.21.2
• 1.21.3
• 1.22.0
• 1.22.1
• 1.22.2
• 1.22.3
• 1.22.4
• 1.23.0
• 1.23.1
• 1.24.0
• 1.24.1
• 1.24.2
• 1.24.3
• 1.24.4
• 1.24.5
• 1.25.0
• 1.25.1
• 1.25.2
• 1.26.0
• 1.26.1
• 1.27.0
• 1.27.1
• 1.27.2
• 6.0.7
• 6.0.9
• 6.1.5
• 6.1.7
• 6.1.9
• 6.2.1
• 6.2.3
• 6.2.5
• 6.2.9
• 6.2.19
• 6.3.1
• 6.3.3
• 6.3.5
• 6.3.7
• 7.0.5
• 7.1.1
• 7.1.5
• 7.2.3
• 7.2.5
• 7.2.7
• 7.2.11
• 7.2.13
• 7.3.1
• 7.3.3
• 7.3.5
• 7.3.9
• 7.3.13
• 7.3.15
• 7.4.1
• 7.4.1.20425
• 7.4.1.20439
• 7.4.3
• 7.4.3.20679
• 7.4.5
• 7.5.1.20813
• 7.5.1.20833
• 7.5.3
• 7.5.5
• 7.5.7
• 7.5.9
• 7.5.11
• 7.5.13.21586
• 7.5.13.21598
• 7.5.15.21611
• 7.5.17.21680
• 7.5.19
• 7.5.20
• 7.5.21.21732
• 8.0.1.21160
• 8.0.1.21164
• 8.1.3
• 8.1.3.21242
• 8.1.5
• 8.1.5.21322
• 8.1.7
• 8.1.7.21417
• 8.1.7.21512
• 8.1.7.21585
• 8.2.1.21612
• 8.2.1.21650
• 8.2.3.30119
• 8.2.4.30130
• 8.4.0
• 8.4.1.30298
• 8.4.1.30307
• 8.4.2.30317
• 8.4.3
• 8.4.4.30419
• 8.4.4.30467
• 8.4.5.30483

License

• commercial

Website

• Vendor: https://www.cisco.com/

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Entryinfo

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