CVE-2026-71911
DrayTek VigorAP Multiple Models Buffer Overflow via setLan
Description
Multiple DrayTek VigorAP models contain a buffer overflow vulnerability in the setLan function. The vulnerability is caused by missing length checks during memory copy operations involving the lanVlanId0, lanIp, and lanNetmask fields. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface.
INFO
Published Date :
Aug. 24, 2026, 6:17 p.m.
Last Modified :
Aug. 26, 2026, 7:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-71911
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update device firmware to the latest available version.
- Ensure length checks are implemented for buffer operations.
- Restrict administrative access to the web interface.
- Monitor for any suspicious network activity.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-71911.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-71911 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-71911
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-71911 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-71911 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Aug. 26, 2026
Action Type Old Value New Value Added Reference https://www.draytek.com/about/security-advisory/multiple-remote-code-execution-and-buffer-overflow-vulnerabilities-in-vigorap-series-august-2026/ Added Reference https://www.vulncheck.com/advisories/draytek-vigorap-multiple-models-buffer-overflow-via-setlan Removed Reference https://www.draytek.com/about/security-advisory/multiple-remote-code-execution-and-buffer-overflow-vulnerabilities-in-vigorap-series-august-2026/ Removed Reference https://www.vulncheck.com/advisories/draytek-vigorap-multiple-models-buffer-overflow-via-setlan -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 26, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-71911', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-26T18:28:32.398763Z'} -
New CVE Received by [email protected]
Aug. 24, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'DrayTek Corporation', 'product': 'VigorAP 918R', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '1.4.11', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'DrayTek Corporation', 'product': 'VigorAP 960C', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '1.4.12', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'DrayTek Corporation', 'product': 'VigorAP 1060C', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '1.4.12', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'DrayTek Corporation', 'product': 'VigorAP 906', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '1.4.13', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'DrayTek Corporation', 'product': 'VigorAP 912C', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '1.4.15', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'DrayTek Corporation', 'product': 'VigorAP 903', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '1.4.22', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}] Added Description Multiple DrayTek VigorAP models contain a buffer overflow vulnerability in the setLan function. The vulnerability is caused by missing length checks during memory copy operations involving the lanVlanId0, lanIp, and lanNetmask fields. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-120 Added Reference https://www.draytek.com/about/security-advisory/multiple-remote-code-execution-and-buffer-overflow-vulnerabilities-in-vigorap-series-august-2026/ Added Reference https://www.vulncheck.com/advisories/draytek-vigorap-multiple-models-buffer-overflow-via-setlan