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Vulnerability record · CVE-2018-3948 · published 30 November 2018

CVE-2018-3948: Tp-link tl-r600vpn firmware improper input validation vulnerability

Tp Link · Tl R600vpn Firmware

An exploitable denial-of-service vulnerability exists in the URI-parsing functionality of the TP-Link TL-R600VPN HTTP server. A specially crafted URL can cause the server to stop responding to requests, resulting in downtime for the management portal. An attacker can send either an unauthenticated or authenticated web request to trigger this vulnerability.

7.5 CVSS 3.1 High EPSS 23% · top 2.3% CWE-20 · Improper input validation
7.5CVSS 3.1 base score, v2 5.0
23%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An exploitable denial-of-service vulnerability exists in the URI-parsing functionality of the TP-Link TL-R600VPN HTTP server. A specially crafted URL can cause the server to stop responding to requests, resulting in downtime for the management portal. An attacker can send either an unauthenticated or authenticated web request to trigger this vulnerability.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://talosintelligence.com/vulnerability_reports/TALOS-2018-0617 ExploitThird Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2018-0617 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2018-3950Tp-link tl-r600vpn firmware out-of-bounds write vulnerabilityAn exploitable remote code execution vulnerability exists in the ping and tracert functionality of the TP-Link TL-R600VPN HWv3 FRNv1.3.0 and HWv2 FRN…EPSS 2.9%7.5CVE-2018-3949TP-Link TL-R600VPN HTTP server path traversal file disclosureThe HTTP server in the TP-Link TL-R600VPN router is vulnerable to directory traversal via a specially crafted URL, allowing sensitive system files to…EPSS 53%analysed7.2CVE-2018-3951Tp-link tl-r600vpn firmware memory buffer overflow vulnerabilityAn exploitable remote code execution vulnerability exists in the HTTP header-parsing function of the TP-Link TL-R600VPN HTTP Server. A specially craf…EPSS 3.9%9.5CVE-2026-93952Arista velocloud orchestrator improper input validation vulnerabilityVeloCloud Orchestrator (VCO) on-prem has a security issue where this issue may allow a remote attacker to access privileged internal functionality an…KEVEPSS 0.90%8.8CVE-2019-1068Microsoft SQL Server improper input validation remote code executionMicrosoft SQL Server mishandles processing of internal functions, allowing an authenticated remote attacker to execute code on the database server. T…KEVEPSS 58%analysed5.9CVE-2025-68686FortiOS symbolic link patch bypass exposes sensitive informationFortiOS contains an information exposure flaw (CWE-200) that lets a remote unauthenticated attacker bypass the patch for the symbolic link persistenc…KEVEPSS 30%analysed9.3CVE-2026-12569PTC Windchill PDMlink and FlexPLM deserialization RCEPTC Windchill PDMlink and FlexPLM contain a deserialization of untrusted data flaw (also classified as improper input validation) that allows remote …KEVEPSS 46%analysed10.0CVE-2026-34910Ubiquiti UniFi OS input validation flaw allows command injectionUniFi OS devices contain an improper input validation vulnerability (CWE-20) that lets a network-reachable attacker inject and execute commands. It a…KEVEPSS 46%analysed

Source: NIST National Vulnerability Database (record CVE-2018-3948), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.