CVE-2023-20158

criticalpriority · track · 40EPSS 0.015 · 74 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.51% (74th) EPSS

CVSS 9.8 · critical

Is it mine?

249 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCisco Small Business Smart and Managed Switchescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.6–9.8

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.18.6highAV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.18.6highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · ENISA EU

v3.18.6highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · psirt@cisco.com USexploitability 3.9 · impact 4

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.18.6highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · Cisco PSIRT US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-120USprimaryCWE-120USCWE-20US

affected products (249)

Products and version ranges known to be affected.

Cisco Small Business 250 Series Smart Switchesall versionscert_bundDEcpe:/h:cisco:small_business:250_series_smart_switches
Cisco Small Business 350 Series Managed Switchesall versionscert_bundDEcpe:/h:cisco:small_business:350_series_managed_switches
Cisco Small Business 350X Series Stackable Managed Switchesall versionscert_bundDEcpe:/h:cisco:small_business:350x_series_stackable_managed_switches
Cisco Small Business 550X Series Stackable Managed Switchesall versionscert_bundDEcpe:/h:cisco:small_business:550x_series_stackable_managed_switches
Cisco Small Business Business 250 Series Smart Switchesall versionscert_bundDEcpe:/h:cisco:small_business:business_250_series_smart_switches
Cisco Small Business Business 350 Series Managed Switchesall versionscert_bundDEcpe:/h:cisco:small_business:business_350_series_managed_switches
Cisco Small Business Small Business 200 Series Smart Switchesall versionscert_bundDEcpe:/h:cisco:small_business:small_business_200_series_smart_switches
Cisco Small Business Small Business 300 Series Managed Switchesall versionscert_bundDEcpe:/h:cisco:small_business:small_business_300_series_managed_switches
Cisco Small Business Small Business 500 Series Stackable Managed Switchesall versionscert_bundDEcpe:/h:cisco:small_business:small_business_500_series_stackable_managed_switches
Cisco Cisco Small Business Smart and Managed Switchesall versionscisco_csafUS
Cisco Cisco Small Business Smart and Managed Switches≤ n/aenisa_euvdEU
Cisco Systems Inc. Business 250 Series Smart Switches≤ 3.3.0.16fstec_bduRU
Cisco Systems Inc. Business 350 Series Managed Switches≤ 3.3.0.16fstec_bduRU
Cisco Systems Inc. Cisco 250 Series Smart Switches≤ 2.5.9.16fstec_bduRU
Cisco Systems Inc. Cisco 350 Series Managed Switches≤ 2.5.9.16fstec_bduRU
Cisco Systems Inc. Cisco 350X Series Stackable Managed Switches≤ 2.5.9.16fstec_bduRU
Cisco Systems Inc. Cisco 550X Series Stackable Managed Switches≤ 2.5.9.16fstec_bduRU
Cisco Systems Inc. Cisco Small Business 200 Series Smart Switchesall versionsfstec_bduRU
Cisco Systems Inc. Cisco Small Business 300 Series Managed Switchesall versionsfstec_bduRU
Cisco Systems Inc. Cisco Small Business 500 Series Stackable Managed Switchesall versionsfstec_bduRU

showing 20 of 249

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-1239Cisco Small Business Switches: Mehrere SchwachstellenDeutsch2023-05-18csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Cisco Small Business Switches ausnutzen, um beliebigen Programmcode mit Administratorrechten auszuführen oder einen Denial of Service Zustand herbeizuführen.
cisco-sa-sg-web-multi-S9g4NkgvCisco Small Business Series Switches Buffer Overflow Vulnerabilities2023-05-17csaf · cisco_csafUS
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 ["#details"] section of this advisory. Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund cisco_csaf NVD CVE.org MITRE

published 2023-05-18modified 2026-06-17

related (5,669)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2025-43520US	medium5.5OT critical	0.43% (37th)	KEV	2025-12-12
A memory corruption issue was addressed with improved memory handling. This issue is fixed in iOS 18.7.2 and iPadOS 18.7.2, iOS 26.1 and iPadOS 26.1, macOS Sequoia 15.7.2, macOS So…
CVE-2025-20333US	—OT critical	71.2% (99th)	KEV	2025-09-25
A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an aut…
CVE-2025-39682US	critical9.8OT critical	3.25% (88th)	KEV	2025-09-05
In the Linux kernel, the following vulnerability has been resolved: tls: fix handling of zero-length records on the rx_list Each recvmsg() call must process either - only contig…
CVE-2025-31277US	—OT critical	1.66% (77th)	KEV	2025-07-30
The issue was addressed with improved memory handling. This issue is fixed in Safari 18.6, iOS 18.6 and iPadOS 18.6, macOS Sequoia 15.6, tvOS 18.6, visionOS 2.6, watchOS 11.6. Proc…
CVE-2025-24985US	—OT critical	3.89% (90th)	KEV	2025-03-11
Integer overflow or wraparound in Windows Fast FAT Driver allows an unauthorized attacker to execute code locally.

+5664 more

references (6)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan