CVE-2023-20189 | Cisco Small Business Series Switches Buffer Overflow Vulnerabilities

Multiple vulnerabilities in the web-based user interface of certain Cisco Small Business Series Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or execute arbitrary code with root privileges on an affected device. These vulnerabilities are due to improper validation of requests that are sent to the web interface. For more information about these vulnerabilities, see the Details section of this advisory.

Published: 2023-05-17 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-20189 is rated High Risk (72.8/100): CVSS High severity, with high exploitation likelihood (EPSS 11.10%, 95th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +6.21% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize 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-2023-20189

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 4.89% 11.10% +6.21%
2 2026-06-07 4.44% 4.89% +0.45%
3 2026-06-01 — 4.44% —

Full EPSS history (19 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-20189

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.6 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/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: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: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.
 3.9 4.0 [email protected]
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2023-20189

Affected software / configurations for CVE-2023-20189

Vendor Product Version Raw CPE
cisco business_250-16p-2g_firmware — cpe:2.3:o:cisco:business_250-16p-2g_firmware:-:*:*:*:*:*:*:*
cisco business_250-16t-2g_firmware — cpe:2.3:o:cisco:business_250-16t-2g_firmware:-:*:*:*:*:*:*:*
cisco business_250-24fp-4g_firmware — cpe:2.3:o:cisco:business_250-24fp-4g_firmware:-:*:*:*:*:*:*:*
cisco business_250-24fp-4x_firmware — cpe:2.3:o:cisco:business_250-24fp-4x_firmware:-:*:*:*:*:*:*:*
cisco business_250-24p-4g_firmware — cpe:2.3:o:cisco:business_250-24p-4g_firmware:-:*:*:*:*:*:*:*
cisco business_250-24p-4x_firmware — cpe:2.3:o:cisco:business_250-24p-4x_firmware:-:*:*:*:*:*:*:*
cisco business_250-24pp-4g_firmware — cpe:2.3:o:cisco:business_250-24pp-4g_firmware:-:*:*:*:*:*:*:*
cisco business_250-24t-4g_firmware — cpe:2.3:o:cisco:business_250-24t-4g_firmware:-:*:*:*:*:*:*:*
cisco business_250-24t-4x_firmware — cpe:2.3:o:cisco:business_250-24t-4x_firmware:-:*:*:*:*:*:*:*
cisco business_250-48p-4g_firmware — cpe:2.3:o:cisco:business_250-48p-4g_firmware:-:*:*:*:*:*:*:*
cisco business_250-48p-4x_firmware — cpe:2.3:o:cisco:business_250-48p-4x_firmware:-:*:*:*:*:*:*:*
cisco business_250-48pp-4g_firmware — cpe:2.3:o:cisco:business_250-48pp-4g_firmware:-:*:*:*:*:*:*:*
cisco business_250-48t-4g_firmware — cpe:2.3:o:cisco:business_250-48t-4g_firmware:-:*:*:*:*:*:*:*
cisco business_250-48t-4x_firmware — cpe:2.3:o:cisco:business_250-48t-4x_firmware:-:*:*:*:*:*:*:*
cisco business_250-8fp-e-2g_firmware — cpe:2.3:o:cisco:business_250-8fp-e-2g_firmware:-:*:*:*:*:*:*:*
cisco business_250-8p-e-2g_firmware — cpe:2.3:o:cisco:business_250-8p-e-2g_firmware:-:*:*:*:*:*:*:*
cisco business_250-8pp-d_firmware — cpe:2.3:o:cisco:business_250-8pp-d_firmware:-:*:*:*:*:*:*:*
cisco business_250-8pp-e-2g_firmware — cpe:2.3:o:cisco:business_250-8pp-e-2g_firmware:-:*:*:*:*:*:*:*
cisco business_250-8t-d_firmware — cpe:2.3:o:cisco:business_250-8t-d_firmware:-:*:*:*:*:*:*:*
cisco business_250-8t-e-2g_firmware — cpe:2.3:o:cisco:business_250-8t-e-2g_firmware:-:*:*:*:*:*:*:*
cisco business_350-12np-4x_firmware — cpe:2.3:o:cisco:business_350-12np-4x_firmware:-:*:*:*:*:*:*:*
cisco business_350-12xs_firmware — cpe:2.3:o:cisco:business_350-12xs_firmware:-:*:*:*:*:*:*:*
cisco business_350-12xt_firmware — cpe:2.3:o:cisco:business_350-12xt_firmware:-:*:*:*:*:*:*:*
cisco business_350-16fp-2g_firmware — cpe:2.3:o:cisco:business_350-16fp-2g_firmware:-:*:*:*:*:*:*:*
cisco business_350-16p-2g_firmware — cpe:2.3:o:cisco:business_350-16p-2g_firmware:-:*:*:*:*:*:*:*
cisco business_350-16p-e-2g_firmware — cpe:2.3:o:cisco:business_350-16p-e-2g_firmware:-:*:*:*:*:*:*:*
cisco business_350-16t-2g_firmware — cpe:2.3:o:cisco:business_350-16t-2g_firmware:-:*:*:*:*:*:*:*
cisco business_350-16t-e-2g_firmware — cpe:2.3:o:cisco:business_350-16t-e-2g_firmware:-:*:*:*:*:*:*:*
cisco business_350-16xts_firmware — cpe:2.3:o:cisco:business_350-16xts_firmware:-:*:*:*:*:*:*:*
cisco business_350-24fp-4g_firmware — cpe:2.3:o:cisco:business_350-24fp-4g_firmware:-:*:*:*:*:*:*:*
cisco business_350-24fp-4x_firmware — cpe:2.3:o:cisco:business_350-24fp-4x_firmware:-:*:*:*:*:*:*:*
cisco business_350-24mgp-4x_firmware — cpe:2.3:o:cisco:business_350-24mgp-4x_firmware:-:*:*:*:*:*:*:*
cisco business_350-24ngp-4x_firmware — cpe:2.3:o:cisco:business_350-24ngp-4x_firmware:-:*:*:*:*:*:*:*
cisco business_350-24p-4g_firmware — cpe:2.3:o:cisco:business_350-24p-4g_firmware:-:*:*:*:*:*:*:*
cisco business_350-24p-4x_firmware — cpe:2.3:o:cisco:business_350-24p-4x_firmware:-:*:*:*:*:*:*:*
cisco business_350-24s-4g_firmware — cpe:2.3:o:cisco:business_350-24s-4g_firmware:-:*:*:*:*:*:*:*
cisco business_350-24t-4g_firmware — cpe:2.3:o:cisco:business_350-24t-4g_firmware:-:*:*:*:*:*:*:*
cisco business_350-24t-4x_firmware — cpe:2.3:o:cisco:business_350-24t-4x_firmware:-:*:*:*:*:*:*:*
cisco business_350-24xs_firmware — cpe:2.3:o:cisco:business_350-24xs_firmware:-:*:*:*:*:*:*:*
cisco business_350-24xt_firmware — cpe:2.3:o:cisco:business_350-24xt_firmware:-:*:*:*:*:*:*:*
cisco business_350-24xts_firmware — cpe:2.3:o:cisco:business_350-24xts_firmware:-:*:*:*:*:*:*:*
cisco business_350-48fp-4g_firmware — cpe:2.3:o:cisco:business_350-48fp-4g_firmware:-:*:*:*:*:*:*:*
cisco business_350-48fp-4x_firmware — cpe:2.3:o:cisco:business_350-48fp-4x_firmware:-:*:*:*:*:*:*:*
cisco business_350-48ngp-4x_firmware — cpe:2.3:o:cisco:business_350-48ngp-4x_firmware:-:*:*:*:*:*:*:*
cisco business_350-48p-4g_firmware — cpe:2.3:o:cisco:business_350-48p-4g_firmware:-:*:*:*:*:*:*:*
cisco business_350-48p-4x_firmware — cpe:2.3:o:cisco:business_350-48p-4x_firmware:-:*:*:*:*:*:*:*
cisco business_350-48t-4g_firmware — cpe:2.3:o:cisco:business_350-48t-4g_firmware:-:*:*:*:*:*:*:*
cisco business_350-48t-4x_firmware — cpe:2.3:o:cisco:business_350-48t-4x_firmware:-:*:*:*:*:*:*:*
cisco business_350-48xt-4x_firmware — cpe:2.3:o:cisco:business_350-48xt-4x_firmware:-:*:*:*:*:*:*:*
cisco business_350-8fp-2g_firmware — cpe:2.3:o:cisco:business_350-8fp-2g_firmware:-:*:*:*:*:*:*:*
cisco business_350-8fp-e-2g_firmware — cpe:2.3:o:cisco:business_350-8fp-e-2g_firmware:-:*:*:*:*:*:*:*
cisco business_350-8mgp-2x_firmware — cpe:2.3:o:cisco:business_350-8mgp-2x_firmware:-:*:*:*:*:*:*:*
cisco business_350-8mp-2x_firmware — cpe:2.3:o:cisco:business_350-8mp-2x_firmware:-:*:*:*:*:*:*:*
cisco business_350-8p-2g_firmware — cpe:2.3:o:cisco:business_350-8p-2g_firmware:-:*:*:*:*:*:*:*
cisco business_350-8p-e-2g_firmware — cpe:2.3:o:cisco:business_350-8p-e-2g_firmware:-:*:*:*:*:*:*:*
cisco business_350-8s-e-2g_firmware — cpe:2.3:o:cisco:business_350-8s-e-2g_firmware:-:*:*:*:*:*:*:*
cisco business_350-8t-e-2g_firmware — cpe:2.3:o:cisco:business_350-8t-e-2g_firmware:-:*:*:*:*:*:*:*
cisco business_350-8xt_firmware — cpe:2.3:o:cisco:business_350-8xt_firmware:-:*:*:*:*:*:*:*
cisco sf200-24_firmware — cpe:2.3:o:cisco:sf200-24_firmware:-:*:*:*:*:*:*:*
cisco sf200-24fp_firmware — cpe:2.3:o:cisco:sf200-24fp_firmware:-:*:*:*:*:*:*:*
cisco sf200-24p_firmware — cpe:2.3:o:cisco:sf200-24p_firmware:-:*:*:*:*:*:*:*
cisco sf200-48_firmware — cpe:2.3:o:cisco:sf200-48_firmware:-:*:*:*:*:*:*:*
cisco sf200-48p_firmware — cpe:2.3:o:cisco:sf200-48p_firmware:-:*:*:*:*:*:*:*
cisco sf200e-24_firmware — cpe:2.3:o:cisco:sf200e-24_firmware:-:*:*:*:*:*:*:*
cisco sf200e-24p_firmware — cpe:2.3:o:cisco:sf200e-24p_firmware:-:*:*:*:*:*:*:*
cisco sf200e-48_firmware — cpe:2.3:o:cisco:sf200e-48_firmware:-:*:*:*:*:*:*:*
cisco sf200e-48p_firmware — cpe:2.3:o:cisco:sf200e-48p_firmware:-:*:*:*:*:*:*:*
cisco sf200e48p_firmware — cpe:2.3:o:cisco:sf200e48p_firmware:-:*:*:*:*:*:*:*
cisco sf250-08_firmware — cpe:2.3:o:cisco:sf250-08_firmware:-:*:*:*:*:*:*:*
cisco sf250-08hp_firmware — cpe:2.3:o:cisco:sf250-08hp_firmware:-:*:*:*:*:*:*:*
cisco sf250-10p_firmware — cpe:2.3:o:cisco:sf250-10p_firmware:-:*:*:*:*:*:*:*
cisco sf250-18_firmware — cpe:2.3:o:cisco:sf250-18_firmware:-:*:*:*:*:*:*:*
cisco sf250-24_firmware — cpe:2.3:o:cisco:sf250-24_firmware:-:*:*:*:*:*:*:*
cisco sf250-24p_firmware — cpe:2.3:o:cisco:sf250-24p_firmware:-:*:*:*:*:*:*:*
cisco sf250-26_firmware — cpe:2.3:o:cisco:sf250-26_firmware:-:*:*:*:*:*:*:*
cisco sf250-26hp_firmware — cpe:2.3:o:cisco:sf250-26hp_firmware:-:*:*:*:*:*:*:*
cisco sf250-26p_firmware — cpe:2.3:o:cisco:sf250-26p_firmware:-:*:*:*:*:*:*:*
cisco sf250-48_firmware — cpe:2.3:o:cisco:sf250-48_firmware:-:*:*:*:*:*:*:*
cisco sf250-48hp_firmware — cpe:2.3:o:cisco:sf250-48hp_firmware:-:*:*:*:*:*:*:*
cisco sf250-50_firmware — cpe:2.3:o:cisco:sf250-50_firmware:-:*:*:*:*:*:*:*

References for CVE-2023-20189

cvelogic Threat Intelligence