CVE-2023-20200

A vulnerability in the Simple Network Management Protocol (SNMP) service of Cisco FXOS Software for Firepower 4100 Series and Firepower 9300 Security Appliances and of Cisco UCS 6300 Series Fabric Interconnects could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to the improper handling of specific SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Note: This vulnerability affects all supported SNMP versions. To exploit this vulnerability through SNMPv2c or earlier, an attacker must know the SNMP community string that is configured on an affected device. To exploit this vulnerability through SNMPv3, the attacker must have valid credentials for an SNMP user who is configured on the affected device.

Published: 2023-08-23 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-20200 is rated Moderate Risk (44.4/100): CVSS High severity, with low exploitation likelihood (EPSS 0.51%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-20200

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.66% 0.51% -0.15%
2 2026-05-18 0.53% 0.66% +0.13%
3 2025-11-27 — 0.53% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-20200

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.7 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
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.
 3.1 4.0 [email protected]
6.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/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:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
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.
 1.8 4.0 [email protected]

Weakness enumeration for CVE-2023-20200

Affected software / configurations for CVE-2023-20200

Vendor Product Version Raw CPE
cisco firepower_9300_firmware — cpe:2.3:o:cisco:firepower_9300_firmware:-:*:*:*:*:*:*:*
cisco firepower_4143_firmware — cpe:2.3:o:cisco:firepower_4143_firmware:-:*:*:*:*:*:*:*
cisco firepower_4112_firmware — cpe:2.3:o:cisco:firepower_4112_firmware:-:*:*:*:*:*:*:*
cisco ucs_6324_fabric_interconnect_firmware >= 4.1, < 4.1\(3l\) cpe:2.3:o:cisco:ucs_6324_fabric_interconnect_firmware:*:*:*:*:*:*:*:*
cisco ucs_6324_fabric_interconnect_firmware >= 4.2, < 4.2\(3d\) cpe:2.3:o:cisco:ucs_6324_fabric_interconnect_firmware:*:*:*:*:*:*:*:*
cisco firepower_4125_firmware — cpe:2.3:o:cisco:firepower_4125_firmware:-:*:*:*:*:*:*:*
cisco firepower_4115 — cpe:2.3:o:cisco:firepower_4115:-:*:*:*:*:*:*:*
cisco ucs_6332_fabric_interconnect_firmware >= 4.1, < 4.1\(3l\) cpe:2.3:o:cisco:ucs_6332_fabric_interconnect_firmware:*:*:*:*:*:*:*:*
cisco ucs_6332_fabric_interconnect_firmware >= 4.2, <= 4.2\(3b\) cpe:2.3:o:cisco:ucs_6332_fabric_interconnect_firmware:*:*:*:*:*:*:*:*
cisco ucs_6332-16up_fabric_interconnect_firmware >= 4.1, < 4.1\(3l\) cpe:2.3:o:cisco:ucs_6332-16up_fabric_interconnect_firmware:*:*:*:*:*:*:*:*
cisco ucs_6332-16up_fabric_interconnect_firmware >= 4.2, < 4.2\(3b\) cpe:2.3:o:cisco:ucs_6332-16up_fabric_interconnect_firmware:*:*:*:*:*:*:*:*

References for CVE-2023-20200

cvelogic Threat Intelligence