Cisco Small Business 300 Series Managed Switches DHCP Denial of Service Vulnerability
Priority MEDIUM 41CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-400.
Summary
A vulnerability in the interactions between the DHCP and TFTP features for Cisco Small Business 300 Series (Sx300) Managed Switches could allow an unauthenticated, remote attacker to cause the device to become low on system memory, which in turn could lead to an unexpected reload of the device and result in a denial of service (DoS) condition on an affected device. The vulnerability is due to a failure to free system memory when an unexpected DHCP request is received. An attacker could exploit this vulnerability by sending a crafted DHCP packet to the targeted device. A successful exploit could allow the attacker to cause an unexpected reload of the device.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02125 82nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cisco | Cisco Small Business 300 Series Managed Switches | 1.4.0.88 | — | No fix listed | CNA |
- Cisco Small Business 300 Series Managed Switches VendorCisco Affected 1.4.0.88 Fixed in — No fix listed CNA
CPE configurations NVD · 54
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:sf302-08pp_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sf302-08pp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sf302-08mpp_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sf302-08mpp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sg300-10pp_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sg300-10pp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sg300-10mpp_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sg300-10mpp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sf300-24pp_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sf300-24pp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:sf302-08pp_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sf302-08pp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sf302-08mpp_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sf302-08mpp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sg300-10pp_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sg300-10pp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sg300-10mpp_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sg300-10mpp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sf300-24pp_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sf300-24pp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Show 44 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:sf300-48pp_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sf300-48pp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sg300-28pp_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sg300-28pp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sf300-08_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sf300-08:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sf300-48p_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sf300-48p:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sg300-10mp_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sg300-10mp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sg300-10p_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sg300-10p:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sg300-10_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sg300-10:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sg300-28p_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sg300-28p:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sf300-24p_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sf300-24p:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sf302-08mp_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sf302-08mp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sg300-28_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sg300-28:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sf300-48_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sf300-48:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sg300-20_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sg300-20:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sf302-08p_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sf302-08p:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sg300-52_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sg300-52:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sf300-24_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sf300-24:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sf302-08_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sf302-08:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sf300-24mp_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sf300-24mp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sg300-10sfp_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sg300-10sfp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sg300-28mp_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sg300-28mp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sg300-52p_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sg300-52p:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:sg300-52mp_firmware:*:*:*:*:*:*:*:* | before 1.4.10.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:sg300-52mp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:sf300-48pp_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sf300-48pp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sg300-28pp_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sg300-28pp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sf300-08_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sf300-08:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sf300-48p_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sf300-48p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sg300-10mp_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sg300-10mp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sg300-10p_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sg300-10p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sg300-10_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sg300-10:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sg300-28p_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sg300-28p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sf300-24p_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sf300-24p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sf302-08mp_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sf302-08mp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sg300-28_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sg300-28:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sf300-48_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sf300-48:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sg300-20_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sg300-20:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sf302-08p_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sf302-08p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sg300-52_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sg300-52:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sf300-24_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sf300-24:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sf302-08_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sf302-08:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sf300-24mp_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sf300-24mp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sg300-10sfp_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sg300-10sfp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sg300-28mp_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sg300-28mp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sg300-52p_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sg300-52p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:sg300-52mp_firmware:*:*:*:*:*:*:*:* Versions before 1.4.10.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:sg300-52mp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2019-1814
- 2026-10-03 Alias added: GHSA-r8m5-hhgx-g34x
References
More Cisco Sf300-08 Firmware vulnerabilities
- TI-2018-10999 Cisco Small Business Switches Privileged Access Vulnerability CVSS 3.1CRITICAL 9.8
- TI-2023-06895 Cisco Small Business Series Switches Buffer Overflow Vulnerabilities CVSS 3.1CRITICAL 9.8
- TI-2023-06868 Cisco Small Business Series Switches Buffer Overflow Vulnerabilities CVSS 3.1CRITICAL 9.8
- TI-2023-06867 Cisco Small Business Series Switches Buffer Overflow Vulnerabilities CVSS 3.1CRITICAL 9.8
- TI-2023-06866 Cisco Small Business Series Switches Buffer Overflow Vulnerabilities CVSS 3.1CRITICAL 9.8
- TI-2023-06869 Cisco Small Business Series Switches Buffer Overflow Vulnerabilities CVSS 3.1CRITICAL 9.8
Sources
- CVE-2019-1814 · CVE Program
- CVE-2019-1814 · NVD
- FIRST EPSS
- GHSA-r8m5-hhgx-g34x · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences