Totolink TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 dhcp_dns formIpv6Setup dhcp_dns1 buffer overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.1$0-$5k0.40

Summaryinfo

A vulnerability described as very critical has been identified in Totolink TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. Affected by this vulnerability is the function formIpv6Setup of the component dhcp_dns. Executing a manipulation of the argument dhcp_dns1 can lead to buffer overflow. This vulnerability is tracked as CVE-2026-42025. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability classified as very critical was found in Totolink TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. This vulnerability affects the function formIpv6Setup of the component dhcp_dns. The manipulation of the argument dhcp_dns1 with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Multiple exploitable stack-based buffer overflow vulnerabilities exist in the boa formIpv6Setup dhcp_dns functionality of X2000R (version(s): TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327). A specially crafted HTTP request can lead to arbitrary code execution. An attacker can make an authenticated HTTP request to trigger these vulnerabilities. This vulnerability concerns the dhcp_dns1 parameter.

The advisory is shared for download at talosintelligence.com. This vulnerability was named CVE-2026-42025 since 04/23/2026. The exploitation appears to be easy. The attack can be initiated remotely. Additional levels of successful authentication are required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/21/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.1
VulDB Meta Temp Score: 9.1

VulDB Base Score: 9.1
VulDB Temp Score: 9.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 9.1
CNA Vector (talos): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

04/23/2026 CVE reserved
10/21/2026 +181 days Advisory disclosed
10/21/2026 +0 days VulDB entry created
10/21/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: talosintelligence.com
Status: Not defined

CVE: CVE-2026-42025 (🔒)
GCVE (CVE): GCVE-0-2026-42025
GCVE (VulDB): GCVE-100-424072

Entryinfo

Created: 10/21/2026 05:28
Changes: 10/21/2026 05:28 (62)
Complete: 🔍
Cache ID: 216::103

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