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CVE-2022-20685

Multiple Cisco Products Snort Modbus Denial of Service Vulnerability

High7.5EPSS 1.5%
Published
Updated
Reserved
Assigned by
cisco

Description

A vulnerability in the Modbus preprocessor of the Snort detection engine could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to an integer overflow while processing Modbus traffic. An attacker could exploit this vulnerability by sending crafted Modbus traffic through an affected device. A successful exploit could allow the attacker to cause the Snort process to hang, causing traffic inspection to stop.Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

Timeline

  1. ID reserved

    By cisco

  2. · 3 years later

    Published

  3. · 2 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-2022-20685, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA-ADPADP (enrichment)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Analyzed3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
1.5% · top 26% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

Affected products

  • Cisco · Cisco Cyber Vision

    • affected 3.0.0
    • affected 3.0.2
    • affected 3.0.3
    • affected 3.0.1
    • affected 3.1.0
    • affected 3.0.4
    • affected 3.1.1
    • affected 3.1.2
    • affected 3.2.0
    • affected 3.0.5
    • affected 3.2.1
    • affected 3.0.6
    • affected 3.2.2
    • affected 3.2.3
    • affected 3.2.4
    • affected 4.0.0
    • affected 4.0.1

  • Cisco · Cisco Firepower Threat Defense Software

    • affected 6.2.3.14
    • affected 6.4.0.1
    • affected 6.2.3.7
    • affected 6.2.3
    • affected 6.4.0.2
    • affected 6.2.3.9
    • affected 6.2.3.1
    • affected 6.2.3.2
    • affected 6.4.0.5
    • affected 6.2.3.10
    • affected 6.4.0
    • affected 6.4.0.3
    • affected 6.2.3.6
    • affected 6.4.0.4
    • affected 6.2.3.15
    • affected 6.2.3.5
    • affected 6.2.3.4
    • affected 6.2.3.3
    • affected 6.2.3.8
    • affected 6.4.0.6
    • affected 6.2.3.11
    • affected 6.2.3.12
    • affected 6.2.3.13
    • affected 6.4.0.7
    • affected 6.4.0.8
    • affected 6.6.0
    • affected 6.4.0.9
    • affected 6.2.3.16
    • affected 6.6.0.1
    • affected 6.6.1
    • affected 6.4.0.10
    • affected 6.7.0
    • affected 6.4.0.11
    • affected 6.6.3
    • affected 6.7.0.1
    • affected 6.6.4
    • affected 6.4.0.12
    • affected 6.7.0.2
    • affected 7.0.0
    • affected 6.2.3.17
    • and 4 more

  • Cisco · Cisco UTD SNORT IPS Engine Software

    • affected 3.17.1S
    • affected 16.12.3
    • affected Fuji-16.9.5
    • affected 16.12.4
    • affected 17.3.1a
    • affected 16.6.6
    • affected 16.12.2
    • affected Fuji-16.9.6
    • affected 3.17.0S
    • affected Fuji-16.9.3
    • affected Denali-16.3.7
    • affected Fuji-16.9.2
    • affected Fuji-16.9.4
    • affected Everest-16.6.4
    • affected Everest-16.6.3
    • affected 16.6.5
    • affected Denali-16.3.5
    • affected 17.2.1r
    • affected 17.1.1
    • affected Everest-16.6.2
    • affected 16.6.7a
    • affected Denali-16.3.4
    • affected 16.6.1
    • affected Denali-16.3.9
    • affected Denali-16.3.3
    • affected 16.12.1a
    • affected 17.3.2
    • affected 17.4.1a
    • affected 16.12.5
    • affected 17.5.1
    • affected Fuji-16.9.7
    • affected 16.6.9
    • affected 17.3.3
    • affected 17.5.1a
    • affected 17.3.4
    • affected 17.3.4a
    • affected 17.4.2
    • affected 17.4.1b
    • affected 17.6.1a
    • affected 16.6.10
    • and 3 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 (2)

Sources

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

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Record last updated .