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No exploitation reported

CVE-2022-20685

No exploitation reported by the sources we read.

  • Published2024-11-15
  • WeaknessCWE-190

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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

dates in UTC
  1. 2024-11-1516:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2022-20685?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2022-20685?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Cisco cyber vision
BranchAffectedFixed in
3.0= 3.0.0no fix published
3.0= 3.0.1no fix published
3.0= 3.0.2no fix published
3.0= 3.0.3no fix published
3.0= 3.0.4no fix published
3.0= 3.0.5no fix published
3.0= 3.0.6no fix published
3.1= 3.1.0no fix published
3.1= 3.1.1no fix published
3.1= 3.1.2no fix published
3.2= 3.2.0no fix published
3.2= 3.2.1no fix published
Cisco secure firewall threat defense
BranchAffectedFixed in
6.2= 6.2.3no fix published
6.2= 6.2.3.1no fix published
6.2= 6.2.3.2no fix published
6.2= 6.2.3.3no fix published
6.2= 6.2.3.4no fix published
6.2= 6.2.3.5no fix published
6.2= 6.2.3.6no fix published
6.2= 6.2.3.7no fix published
6.2= 6.2.3.8no fix published
6.2= 6.2.3.9no fix published
6.2= 6.2.3.10no fix published
6.2= 6.2.3.11no fix published
Cisco unified threat defense snort intrusion prevention system engine
BranchAffectedFixed in
3.17= 3.17.0sno fix published
3.17= 3.17.1sno fix published
16.6= 16.6.1no fix published
16.6= 16.6.5no fix published
16.6= 16.6.6no fix published
16.6= 16.6.7ano fix published
16.6= 16.6.9no fix published
16.6= 16.6.10no fix published
16.12= 16.12.1ano fix published
16.12= 16.12.2no fix published
16.12= 16.12.3no fix published
16.12= 16.12.4no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2024-11-15
  • OpenCVESSVC decisionnone—
  • CISA-ADPCVSS 3.17.52025-01-27
  • CNACVSS 3.17.5read 2026-10-23
  • CISA-ADPweakness (CWE)CWE-1902025-01-27
  • CNAweakness (CWE)CWE-190read 2026-10-23
  • FIRST EPSSEPSS score1.5 %2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2024-11-15
Last Modified
2026-08-11
NVD status
Analyzed

Frequently asked questions

What is CVE-2022-20685?

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.

Is CVE-2022-20685 actively exploited?

Active exploitation of CVE-2022-20685 has not been confirmed. Its EPSS score was 1.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-20685?

CVE-2022-20685 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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