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CVE-2023-20177

A vulnerability in the SSL file policy implementation of Cisco Firepower Threat Defense (FTD) Software that occurs when the SSL/TLS…

Medium4.0EPSS 0.71%
Published
Updated
Reserved
Assigned by
cisco

Description

A vulnerability in the SSL file policy implementation of Cisco Firepower Threat Defense (FTD) Software that occurs when the SSL/TLS connection is configured with a URL Category and the Snort 3 detection engine could allow an unauthenticated, remote attacker to cause the Snort 3 detection engine to unexpectedly restart. This vulnerability exists because a logic error occurs when a Snort 3 detection engine inspects an SSL/TLS connection that has either a URL Category configured on the SSL file policy or a URL Category configured on an access control policy with TLS server identity discovery enabled. Under specific, time-based constraints, an attacker could exploit this vulnerability by sending a crafted SSL/TLS connection through an affected device. A successful exploit could allow the attacker to trigger an unexpected reload of the Snort 3 detection engine, resulting in either a bypass or denial of service (DoS) condition, depending on device configuration. The Snort 3 detection engine will restart automatically. No manual intervention is required.

Scores

CVSS scores of CVE-2023-20177, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1Medium4.0CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L
NVDNVD · Modified3.1Medium4.0CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L
EPSS (exploitation in 30 days)
0.71% · top 46% of all CVEs (6 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.0.

Weakness

Affected products

  • Cisco · Cisco Firepower Threat Defense Software

    • affected 7.0.0
    • affected 7.0.0.1
    • affected 7.0.1
    • affected 7.0.1.1
    • affected 7.0.2
    • affected 7.0.2.1
    • affected 7.0.3
    • affected 7.0.4
    • affected 7.0.5
    • affected 7.1.0
    • affected 7.1.0.1
    • affected 7.1.0.2
    • affected 7.1.0.3
    • affected 7.2.0
    • affected 7.2.0.1
    • affected 7.2.1
    • affected 7.2.2
    • affected 7.2.3
    • affected 7.3.0
    • affected 7.3.1
    • affected 7.3.1.1

What to do

Exploitation: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .