CVE-2022-20685 [High] | Integer Overflow in Cyber Vision

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.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.50%	1.39%	+0.88%
2	2025-12-24	0.78%	0.50%	-0.28%
3	2025-11-21	—	0.78%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.50%

1.39%

+0.88%

2025-12-24

0.78%

0.50%

-0.28%

2025-11-21

—

0.78%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.5	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	3.6	[email protected]
7.5	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	3.6	134c704f-9b21-4f2e-91b3-4a467353bcc0

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.5

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

3.6

[email protected]

7.5

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

3.6

134c704f-9b21-4f2e-91b3-4a467353bcc0

Affected software / configurations for CVE-2022-20685

Vendor	Product	Version	Raw CPE
cisco	cyber_vision	3.0.0	cpe:2.3:a:cisco:cyber_vision:3.0.0:::::::*
cisco	cyber_vision	3.0.1	cpe:2.3:a:cisco:cyber_vision:3.0.1:::::::*
cisco	cyber_vision	3.0.2	cpe:2.3:a:cisco:cyber_vision:3.0.2:::::::*
cisco	cyber_vision	3.0.3	cpe:2.3:a:cisco:cyber_vision:3.0.3:::::::*
cisco	cyber_vision	3.0.4	cpe:2.3:a:cisco:cyber_vision:3.0.4:::::::*
cisco	cyber_vision	3.0.5	cpe:2.3:a:cisco:cyber_vision:3.0.5:::::::*
cisco	cyber_vision	3.0.6	cpe:2.3:a:cisco:cyber_vision:3.0.6:::::::*
cisco	cyber_vision	3.1.0	cpe:2.3:a:cisco:cyber_vision:3.1.0:::::::*
cisco	cyber_vision	3.1.1	cpe:2.3:a:cisco:cyber_vision:3.1.1:::::::*
cisco	cyber_vision	3.1.2	cpe:2.3:a:cisco:cyber_vision:3.1.2:::::::*
cisco	cyber_vision	3.2.0	cpe:2.3:a:cisco:cyber_vision:3.2.0:::::::*
cisco	cyber_vision	3.2.1	cpe:2.3:a:cisco:cyber_vision:3.2.1:::::::*
cisco	cyber_vision	3.2.2	cpe:2.3:a:cisco:cyber_vision:3.2.2:::::::*
cisco	cyber_vision	3.2.3	cpe:2.3:a:cisco:cyber_vision:3.2.3:::::::*
cisco	cyber_vision	3.2.4	cpe:2.3:a:cisco:cyber_vision:3.2.4:::::::*
cisco	cyber_vision	4.0.0	cpe:2.3:a:cisco:cyber_vision:4.0.0:::::::*
cisco	cyber_vision	4.0.1	cpe:2.3:a:cisco:cyber_vision:4.0.1:::::::*
cisco	firepower_threat_defense	6.2.3	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3:::::::*
cisco	firepower_threat_defense	6.2.3.1	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.1:::::::*
cisco	firepower_threat_defense	6.2.3.2	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.2:::::::*
cisco	firepower_threat_defense	6.2.3.3	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.3:::::::*
cisco	firepower_threat_defense	6.2.3.4	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.4:::::::*
cisco	firepower_threat_defense	6.2.3.5	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.5:::::::*
cisco	firepower_threat_defense	6.2.3.6	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.6:::::::*
cisco	firepower_threat_defense	6.2.3.7	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.7:::::::*
cisco	firepower_threat_defense	6.2.3.8	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.8:::::::*
cisco	firepower_threat_defense	6.2.3.9	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.9:::::::*
cisco	firepower_threat_defense	6.2.3.10	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.10:::::::*
cisco	firepower_threat_defense	6.2.3.11	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.11:::::::*
cisco	firepower_threat_defense	6.2.3.12	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.12:::::::*
cisco	firepower_threat_defense	6.2.3.13	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.13:::::::*
cisco	firepower_threat_defense	6.2.3.14	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.14:::::::*
cisco	firepower_threat_defense	6.2.3.15	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.15:::::::*
cisco	firepower_threat_defense	6.2.3.16	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.16:::::::*
cisco	firepower_threat_defense	6.2.3.17	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.17:::::::*
cisco	firepower_threat_defense	6.2.3.18	cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.18:::::::*
cisco	firepower_threat_defense	6.4.0	cpe:2.3:a:cisco:firepower_threat_defense:6.4.0:::::::*
cisco	firepower_threat_defense	6.4.0.1	cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.1:::::::*
cisco	firepower_threat_defense	6.4.0.2	cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.2:::::::*
cisco	firepower_threat_defense	6.4.0.3	cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.3:::::::*
cisco	firepower_threat_defense	6.4.0.4	cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.4:::::::*
cisco	firepower_threat_defense	6.4.0.5	cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.5:::::::*
cisco	firepower_threat_defense	6.4.0.6	cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.6:::::::*
cisco	firepower_threat_defense	6.4.0.7	cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.7:::::::*
cisco	firepower_threat_defense	6.4.0.8	cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.8:::::::*
cisco	firepower_threat_defense	6.4.0.9	cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.9:::::::*
cisco	firepower_threat_defense	6.4.0.10	cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.10:::::::*
cisco	firepower_threat_defense	6.4.0.11	cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.11:::::::*
cisco	firepower_threat_defense	6.4.0.12	cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.12:::::::*
cisco	firepower_threat_defense	6.6.0	cpe:2.3:a:cisco:firepower_threat_defense:6.6.0:::::::*
cisco	firepower_threat_defense	6.6.0.1	cpe:2.3:a:cisco:firepower_threat_defense:6.6.0.1:::::::*
cisco	firepower_threat_defense	6.6.1	cpe:2.3:a:cisco:firepower_threat_defense:6.6.1:::::::*
cisco	firepower_threat_defense	6.6.3	cpe:2.3:a:cisco:firepower_threat_defense:6.6.3:::::::*
cisco	firepower_threat_defense	6.6.4	cpe:2.3:a:cisco:firepower_threat_defense:6.6.4:::::::*
cisco	firepower_threat_defense	6.6.5	cpe:2.3:a:cisco:firepower_threat_defense:6.6.5:::::::*
cisco	firepower_threat_defense	6.7.0	cpe:2.3:a:cisco:firepower_threat_defense:6.7.0:::::::*
cisco	firepower_threat_defense	6.7.0.1	cpe:2.3:a:cisco:firepower_threat_defense:6.7.0.1:::::::*
cisco	firepower_threat_defense	6.7.0.2	cpe:2.3:a:cisco:firepower_threat_defense:6.7.0.2:::::::*
cisco	firepower_threat_defense	6.7.0.3	cpe:2.3:a:cisco:firepower_threat_defense:6.7.0.3:::::::*
cisco	firepower_threat_defense	7.0.0	cpe:2.3:a:cisco:firepower_threat_defense:7.0.0:::::::*
cisco	firepower_threat_defense	7.0.0.1	cpe:2.3:a:cisco:firepower_threat_defense:7.0.0.1:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	3.17.0s	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:3.17.0s:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	3.17.1s	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:3.17.1s:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.6.1	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:16.6.1:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.6.5	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:16.6.5:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.6.6	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:16.6.6:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.6.7a	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:16.6.7a:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.6.9	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:16.6.9:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.6.10	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:16.6.10:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.12.1a	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:16.12.1a:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.12.2	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:16.12.2:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.12.3	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:16.12.3:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.12.4	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:16.12.4:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.12.5	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:16.12.5:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	16.12.6	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:16.12.6:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.1.1	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.1.1:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.2.1r	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.2.1r:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.3.1a	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.3.1a:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.3.2	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.3.2:::::::*
cisco	unified_threat_defense_snort_intrusion_prevention_system_engine	17.3.3	cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.3.3:::::::*

References for CVE-2022-20685

URL	Tags
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sna-xss-NXOxDhRQ	Not Applicable
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-dos-9D3hJLuj	Vendor Advisory

URL

CVE-2022-20685 | Multiple Cisco Products Snort Modbus Denial of Service Vulnerability

Exploit prediction scoring system (EPSS) score for CVE-2022-20685

Common vulnerability scoring system (CVSS) metrics for CVE-2022-20685

Weakness enumeration for CVE-2022-20685

Affected software / configurations for CVE-2022-20685

References for CVE-2022-20685