CVE-2019-1814: Cisco Small Business 300 Series Managed Switches DHCP Denial of Service Vulnerability
First published: Wed May 15 2019(Updated: )
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.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Sf302-08pp Firmware | <1.4.10.6 | |
| Cisco Sf302-08pp | ||
| Cisco Sf302-08mpp Firmware | <1.4.10.6 | |
| Cisco Sf302-08mpp | ||
| Cisco Sg300-10pp Firmware | <1.4.10.6 | |
| Cisco Sg300-10pp | ||
| Cisco Sg300-10mpp Firmware | <1.4.10.6 | |
| Cisco Sg300-10mpp | ||
| Cisco Sf300-24pp Firmware | <1.4.10.6 | |
| Cisco Sf300-24pp | ||
| Cisco Sf300-48pp Firmware | <1.4.10.6 | |
| Cisco Sf300-48pp | ||
| Cisco Sg300-28pp Firmware | <1.4.10.6 | |
| Cisco Sg300-28pp | ||
| Cisco Sf300-08 Firmware | <1.4.10.6 | |
| Cisco Sf300-08 | ||
| Cisco Sf300-48p Firmware | <1.4.10.6 | |
| Cisco Sf300-48p | ||
| Cisco Sg300-10mp Firmware | <1.4.10.6 | |
| Cisco Sg300-10mp | ||
| Cisco Sg300-10p Firmware | <1.4.10.6 | |
| Cisco Sg300-10p | ||
| Cisco Sg300-10 Firmware | <1.4.10.6 | |
| Cisco Sg300-10 | ||
| Cisco Sg300-28p Firmware | <1.4.10.6 | |
| Cisco Sg300-28p | ||
| Cisco Sf300-24p Firmware | <1.4.10.6 | |
| Cisco Sf300-24p | ||
| Cisco Sf302-08mp Firmware | <1.4.10.6 | |
| Cisco Sf302-08mp | ||
| Cisco Sg300-28 Firmware | <1.4.10.6 | |
| Cisco Sg300-28 | ||
| Cisco Sf300-48 Firmware | <1.4.10.6 | |
| Cisco Sf300-48 | ||
| Cisco Sg300-20 Firmware | <1.4.10.6 | |
| Cisco Sg300-20 | ||
| Cisco Sf302-08p Firmware | <1.4.10.6 | |
| Cisco Sf302-08p | ||
| Cisco Sg300-52 Firmware | <1.4.10.6 | |
| Cisco Sg300-52 | ||
| Cisco Sf300-24 Firmware | <1.4.10.6 | |
| Cisco Sf300-24 | ||
| Cisco Sf302-08 Firmware | <1.4.10.6 | |
| Cisco Sf302-08 | ||
| Cisco Sf300-24mp Firmware | <1.4.10.6 | |
| Cisco Sf300-24mp | ||
| Cisco Sg300-10sfp Firmware | <1.4.10.6 | |
| Cisco Sg300-10sfp | ||
| Cisco Sg300-28mp Firmware | <1.4.10.6 | |
| Cisco Sg300-28mp | ||
| Cisco Sg300-52p Firmware | <1.4.10.6 | |
| Cisco Sg300-52p | ||
| Cisco Sg300-52mp Firmware | <1.4.10.6 | |
| Cisco Sg300-52mp |
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Reference Links
Frequently Asked Questions
What is CVE-2019-1814?
CVE-2019-1814 is a vulnerability in the interactions between the DHCP and TFTP features for Cisco Small Business 300 Series (Sx300) Managed Switches.
How does CVE-2019-1814 affect Cisco Small Business 300 Series Managed Switches?
CVE-2019-1814 could allow an unauthenticated, remote attacker to cause the device to become low on system memory, which could lead to an unexpected reload of the device.
What is the severity of CVE-2019-1814?
CVE-2019-1814 has a severity rating of 8.6 (high).
Is there a fix available for CVE-2019-1814?
Yes, Cisco has released a security advisory with mitigation recommendations for CVE-2019-1814.
Where can I find more information about CVE-2019-1814?
You can find more information about CVE-2019-1814 in the following references: [SecurityFocus](http://www.securityfocus.com/bid/108344), [Cisco Security Advisory](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-sb300sms-dhcp).
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