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CVE-2023-20083

A vulnerability in ICMPv6 inspection when configured with the Snort 2 detection engine for Cisco Firepower Threat Defense (FTD) Software…

High8.6EPSS 0.93%
Published
Updated
Reserved
Assigned by
cisco

Description

A vulnerability in ICMPv6 inspection when configured with the Snort 2 detection engine for Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the CPU of an affected device to spike to 100 percent, which could stop all traffic processing and result in a denial of service (DoS) condition. FTD management traffic is not affected by this vulnerability. This vulnerability is due to improper error checking when parsing fields within the ICMPv6 header. An attacker could exploit this vulnerability by sending a crafted ICMPv6 packet through an affected device. A successful exploit could allow the attacker to cause the device to exhaust CPU resources and stop processing traffic, resulting in a DoS condition. Note: To recover from the DoS condition, the Snort 2 Detection Engine or the Cisco FTD device may need to be restarted.

Timeline

  1. ID reserved

    By cisco

  2. · 12 months later

    Published

  3. · 9 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2023-20083, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1High8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVDNVD · Modified3.1High8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.93% · top 39% of all CVEs (7 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.6.

Weakness

Affected products

  • Cisco · Cisco Firepower Threat Defense Software

    • affected 6.2.3
    • affected 6.2.3.1
    • affected 6.2.3.2
    • affected 6.2.3.3
    • affected 6.2.3.4
    • affected 6.2.3.5
    • affected 6.2.3.6
    • affected 6.2.3.7
    • affected 6.2.3.8
    • affected 6.2.3.10
    • affected 6.2.3.11
    • affected 6.2.3.9
    • affected 6.2.3.12
    • affected 6.2.3.13
    • affected 6.2.3.14
    • affected 6.2.3.15
    • affected 6.2.3.16
    • affected 6.2.3.17
    • affected 6.2.3.18
    • affected 6.6.0
    • affected 6.6.0.1
    • affected 6.6.1
    • affected 6.6.3
    • affected 6.6.4
    • affected 6.6.5
    • affected 6.6.5.1
    • affected 6.6.5.2
    • affected 6.6.7
    • affected 6.6.7.1
    • affected 6.4.0
    • affected 6.4.0.1
    • affected 6.4.0.3
    • affected 6.4.0.2
    • affected 6.4.0.4
    • affected 6.4.0.5
    • affected 6.4.0.6
    • affected 6.4.0.7
    • affected 6.4.0.8
    • affected 6.4.0.9
    • affected 6.4.0.10
    • and 32 more

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.

Badge for a README or a ticket

CVE-2023-20083 badge
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Record last updated .