CVE-2019-1913

CRITICAL

Cisco Small Business 220 Series Smart Switches < 1.1.4.4 - Unauthenticated Remote Code Execution via Buffer Overflow

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2019-1913.

AI-analyzed exploit summary This Python script is a functional exploit for CVE-2019-1913, targeting a stack overflow vulnerability in Realtek Managed Switch Controller (RTL83xx) devices. It leverages a 'one byte read-write loop' without boundary checks in Boa/Hydra web servers, allowing remote code execution via a reverse shell.

Description

Multiple vulnerabilities in the web management interface of Cisco Small Business 220 Series Smart Switches could allow an unauthenticated, remote attacker to overflow a buffer, which then allows the execution of arbitrary code with root privileges on the underlying operating system. The vulnerabilities are due to insufficient validation of user-supplied input and improper boundary checks when reading data into an internal buffer. An attacker could exploit these vulnerabilities by sending malicious requests to the web management interface of an affected device. Depending on the configuration of the affected switch, the malicious requests must be sent via HTTP or HTTPS.

Exploits (1)

exploitdb WORKING POC
pythonremotehardware
https://www.exploit-db.com/exploits/47442

This Python script is a functional exploit for CVE-2019-1913, targeting a stack overflow vulnerability in Realtek Managed Switch Controller (RTL83xx) devices. It leverages a 'one byte read-write loop' without boundary checks in Boa/Hydra web servers, allowing remote code execution via a reverse shell.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Realtek Managed Switch Controller (RTL83xx) with various vendor firmwares (e.g., Cisco Sx220, NETGEAR GS728TPv2, Zyxel GS1900-24)
No auth needed
Prerequisites: Network access to the target device · Knowledge of the target's ETag for firmware identification
devstral-2 · analyzed Feb 19, 2026 Full analysis →

References (2)

Core 2

Scores

CVSS v3 9.8
EPSS 0.2594
EPSS Percentile 97.7%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-119
Status published
Products (11)
cisco/sf-220-24_firmware < 1.1.4.4
cisco/sf220-24p_firmware < 1.1.4.4
cisco/sf220-48_firmware < 1.1.4.4
cisco/sf220-48p_firmware < 1.1.4.4
cisco/sg220-26_firmware < 1.1.4.4
cisco/sg220-26p_firmware < 1.1.4.4
cisco/sg220-28_firmware < 1.1.4.4
cisco/sg220-28mp_firmware < 1.1.4.4
cisco/sg220-50_firmware < 1.1.4.4
cisco/sg220-50p_firmware < 1.1.4.4
... and 1 more
Published Aug 07, 2019
Tracked Since Feb 18, 2026